Matlab reverse y axis

Sep 21, 2017 · I have multiple things plotting on one graph and have one of the axes on the right side and the other two on the left. I would like to reverse the order of the right side label only. I do not want to reverse the axis. Is there a way to do this? Thanks!

Matlab reverse y axis. Add another sine wave to the axes using hold on. Keep the current axis limits by setting the limits mode to manual. y2 = 2*sin(x); hold on. axis manual. plot(x,y2) hold off. If you want the axes to choose the appropriate limits, set the limits mode back to automatic.

Starting in R2019b, you can display a tiling of plots using the tiledlayout and nexttile functions. Call the tiledlayout function to create a 2-by-1 tiled chart layout. Call the nexttile function to create an axes object and return the object as ax1.Create the top plot by passing ax1 to the plot function. Add a title and y-axis label to the plot by passing the axes to the title and ylabel ...

Hi i'm looking for a synatix or function that rotates a plot, e.g if i have a peak that is a minimum, is there a way to flip it upside down and make it a maximum? (bareing in mind the peaks are ...You also can change where the x-axis and y-axis lines appear (2-D plots only) or reverse the direction of increasing values along each axis. Change Axis Limits. ... Set the maximum x-axis limit to 0 and the minimum y-axis limit to -1. Let MATLAB choose the other limits. For an automatically calculated minimum or maximum limit, use -inf or inf ...Changing horizontal axis to descending order. Hi all. Do anyone know how to change the order of xaxis labels in the plot function? Instead of, say, 1 , 2 , 3... i would the axis to plot for ..., 3, 2, 1. Thank a lot,x = linspace (0,10); y = sin (x); plot (x,y) Add another sine wave to the axes using hold on. Keep the current axis limits by setting the limits mode to manual. y2 = 2*sin (x); hold on axis manual plot (x,y2) hold off. If you want the axes to choose the appropriate limits, set the limits mode back to automatic.Create a chart with two y -axes and plot data. Reverse the direction of increasing values along each y -axis. Use yyaxis left to activate the left side and set the direction for the left y -axis. Similarly, use yyaxis right to activate the …Reverse y axis order. Learn more about reverse y axis, plot, axis properties . ... Find the treasures in MATLAB Central and discover how the community can help you!Commented: Walter Roberson on 6 Jun 2017. Accepted Answer: Walter Roberson. I have a step function plot in matlab. I want to reverse the y axis so that the initial value is at the top and also the x axis start from that point only.

Reversing axes in contourf plot. Learn more about contour, axes, reverseStarting in R2019b, you can display a tiling of plots using the tiledlayout and nexttile functions. Call the tiledlayout function to create a 2-by-1 tiled chart layout. Call the nexttile function to create the axes objects ax1 and ax2.Plot data into each axes. Set the y-axis ticks for the lower plot by passing ax2 as the first input argument to the yticks function.Link. Edited: DGM on 11 Feb 2024. Accepted Answer: madhan ravi. Open in MATLAB Online. Dear all, I want to change the x-axis direction from right to left but also keeping the values to be not affected (reversed/flipped). when I used the fooling command the mentioned problem is caused: Theme. Copy. set (gca, 'XDir','reverse')Description. B = flipud(A) returns A with its rows flipped in the up-down direction (that is, about a horizontal axis). If A is a column vector, then flipud(A) returns a vector of the same length with the order of its elements reversed. If A is a row vector, then flipud(A) simply returns A. For multidimensional arrays, flipud operates on the ...Programmatically, you can call. set(gca,'YDir','reverse') Alternatively, you can select the arrow in the figure window, double-click on the axes, and click the 'reverse' checkbox in the plot editor for the y-axis. answered Mar 17, 2011 at 15:36. Jonas.Reverse y axis order. Learn more about reverse y axis, plot, axis properties . Hi. I have the following script (attached )b and the run that it opens can be found at this link. ... Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting!Edited: DGM on 11 Feb 2024. Accepted Answer: madhan ravi. Open in MATLAB Online. Dear all, I want to change the x-axis direction from right to left but also keeping the values to be not affected (reversed/flipped). when I used the fooling command the mentioned problem is caused: Theme. Copy. set (gca, 'XDir','reverse') How can I solve that?Open in MATLAB Online. Hi everybody, I'm trying to plot the price of an option against time to expiration time in days (in positive integer ofc). But I need to reverse the time.

Flip an Image Using the flip() Function in MATLAB. Images are composed of pixels. For example, if you have a 200 by 200-pixel image, meaning there are 200 pixels on the vertical axis and 200 pixels on the horizontal axis. We have to read and store the image in Matlab using the imread() function. It will be stored in a matrix, and each element ...Commented: Walter Roberson on 6 Jun 2017. Accepted Answer: Walter Roberson. I have a step function plot in matlab. I want to reverse the y axis so that the initial value is at the top and also the x axis start from that point only.In Matplotlib we can reverse axes of a graph using multiple methods. Most common method is by using invert_xaxis () and invert_yaxis () for the axes objects. Other than that we can also use xlim () and ylim (), and axis () methods for the pyplot object. Method 1: Using invert_xaxis () and invert_yaxis () method.Learn more about axis reverse . ... MATLAB Graphics Formatting and Annotation Labels and Annotations Annotations. Find more on Annotations in Help Center and File Exchange. Tags axis reverse; Community Treasure Hunt. Find the treasures in MATLAB Central and discover how the community can help you!

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Hello, I want to plot a graph with one x axis and two y axes. I want one of the y axes to be reversed i.e. beginning at the top so the data hangs off the top of the graph. Additionally I want the reversed y axis plot to be a bar graph and the other to be an ordinary line plot.Control Value of Exponent in Secondary Label Using Ruler Objects. Plot data with y values that range between -15,000 and 15,000. By default, the y-axis tick labels use exponential notation with an exponent value of 4 and a base of 10.Change the exponent value to 2. Set the Exponent property of the ruler object associated with the y-axis.Access the ruler object through the YAxis property of the ... Hi, How to reverse the Y axis while displaying images with imagesc function.. I have tried as follows, it does the job, however, reverses the image as well. ax = gca; imagesc(x,y,I'); set(g... Revert y-axis order in BarPlot. Learn more about graph, barplot I would like to revert the y-axis order of the plot , in such a way to have the most frequent element on top (close the y upper limit) and the less frequent (close to the x-sxis) x = {'Breast' 'C...I would like to make a heatmap from tabular data. My code is below. The heatmap has y-axis values descending order, I would like to them in ascending order. However using set(gca..) gives me the following error:The name 'YDir' is not an accessible property for an instance of class 'matlab.graphics.chart.HeatmapChart'.The first row of pixels is normally at the top of an image. By default, the IMAGE and IMAGESC functions invert the y-axis direction when the image is displayed on an axes by setting the 'YDir' property to 'reverse.' To invert the y-axis direction, set the 'YDir' property to 'normal', as follows:

subplot (3,1,3) % now plot but put y on x axis instead... plot (y,x) set (gca,'ydir','reverse') % reverse the y axis to match view. title ('Two argument plot & reverse yaxis') The above produces--. Note the last two are identical and that all it takes is using both an x,y vector in plot.how to reverse the axis in matlab??. Learn more about revesing axis MATLABModify Properties of Charts with Two y-Axes. The yyaxis function creates an Axes object with a y-axis on the left and right sides.Axes properties related to the y-axis have two values.However, MATLAB ® gives access only to the value for the active side. For example, if the left side is active, then the YDir property of the Axes object contains the direction for the left y-axis.Set y-axis as vertical when plotting in 3d. Learn more about plot3, vertical axis . ... But this gets VERY confusing when trying to manipulate the resulting plots using the default Matlab functions like "axis" and "surface," as these assume that the Z-axis is the vertical. ... % Reverse the x axis 0 Comments. Show -2 older comments Hide -2 ...See list of participating sites @NCIPrevention @NCISymptomMgmt @NCICastle The National Cancer Institute NCI Division of Cancer Prevention DCP Home Contact DCP Policies Disclaimer P...The following example shows how to exchange the x and y axes of the current figure: X = (1:100)'; %# Create x axis data Y = randn(100, 1); %# Create y axis data plot(X, Y); %# Plot the data view(-90, 90) %# Swap the axes set(gca, 'ydir', 'reverse'); %# Reverse the y-axis (Optional step) Also, a relevant link to Matlab Central is here.The first row of pixels is normally at the top of an image. By default, the IMAGE and IMAGESC functions invert the y-axis direction when the image is displayed on an axes by setting the 'YDir' property to 'reverse.' To invert the y-axis direction, set the 'YDir' property to 'normal', as follows:If you are driving an automatic transmission vehicle and it can only go in reverse, you may have a serious transmission issue that can only be solved by a mechanic. However, some t...plot(x,y) Add another sine wave to the axes using hold on. Keep the current axis limits by setting the limits mode to manual. y2 = 2*sin(x); hold on. axis manual. plot(x,y2) hold off. If you want the axes to choose the appropriate limits, set the limits mode back to automatic.Mostrar las líneas del eje a través del origen. De forma predeterminada, los ejes x e y aparecen a lo largo de los límites exteriores de los ejes. Cambie la ubicación de las líneas del eje de manera que se crucen en el punto de origen (0,0) estableciendo las propiedades XAxisLocation y YAxisLocation del objeto Axes.Establezca XAxisLocation en 'top', 'bottom' o 'origin'.Is there a way I could flip the height to start from zero and also change the position of the plot in the same direction? pts1 = linspace(0, 40, 41); % for heights pts2 = linspace(-25, 70, 96);...

Axes Properties. Axes appearance and behavior. expand all in page. Axes properties control the appearance and behavior of an Axes object. By changing property values, you can modify certain aspects of the axes. Use dot notation to query and set properties. ax = gca; c = ax.Color; ax.Color = 'blue';

In order to mesure the flame length, I have to plot axis. I managed to have axis and all, with a custom origin point, but I could not reverse the y axis. Theme. Copy. figure (7);clf; Image = 'input.jpg'; [rows, columns, ColorChannels] = size (Image); origin = [center] % center is a well defined coordinates. xdata = -origin (1): columns - origin ...get(axes1, 'Type') % Or in newer versions of MATLAB class(axes1) You'll want to instead set the YDir on it's parent axes. We can easily get that using the ancestor function. hax …Modify Properties of Charts with Two y-Axes. The yyaxis function creates an Axes object with a y-axis on the left and right sides.Axes properties related to the y-axis have two values.However, MATLAB ® gives access only to the value for the active side. For example, if the left side is active, then the YDir property of the Axes object contains the direction for the left y-axis.1. Link. After displaying an image with the IMAGESC function, you can change the axis so it is decreasing from top to bottom. For example, Theme. Copy. load clown. X = flipud (X); imagesc (X)Learn more about plotting, two y axes, reverse direction. Hello, I want to plot a graph with one x axis and two y axes. I want one of the y axes to be reversed i.e. beginning at the top so the data hangs off the top of the graph. ... MATLAB Graphics 2-D and 3-D Plots Line Plots Two y-axis. Find more on Two y-axis in Help Center and File ...I want to create a scatter plot with both axis reversed. How to do this in Octave? (I already have the points to plot in two column vectors X and Y, of equal size)Edited: Stalin Samuel on 31 Jan 2017. Open in MATLAB Online. If you planning to change the ylabel use. Theme. Copy. set (gca,'YtickLabel',14:-2:0) Or else, if you wants to flip b alone you can use. Theme.How to reverse Y axis on image?. Learn more about image, reverse, axis, yaxis, flip MATLAB. Hello, First of all, I know this question is dumb and that there is plenty of thread on it, but I could not find any solution in those. I already tried a lot of things and it did not work for me...In order to mesure the flame length, I have to plot axis. I managed to have axis and all, with a custom origin point, but I could not reverse the y axis. Theme. Copy. figure (7);clf; Image = 'input.jpg'; [rows, columns, ColorChannels] = size (Image); origin = [center] % center is a well defined coordinates. xdata = -origin (1): columns - origin ...Reverse y axis order. Learn more about reverse y axis, plot, axis properties . Hi. I have the following script (attached )b and the run that it opens can be found at this link. ... Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting!

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subplot (3,1,3) % now plot but put y on x axis instead... plot (y,x) set (gca,'ydir','reverse') % reverse the y axis to match view. title ('Two argument plot & reverse yaxis') The above produces--. Note the last two are identical and that all it takes is using both an x,y vector in plot.Hi i'm looking for a synatix or function that rotates a plot, e.g if i have a peak that is a minimum, is there a way to flip it upside down and make it a maximum? (bareing in mind the peaks are ...The first row of pixels is normally at the top of an image. By default, the IMAGE and IMAGESC functions invert the y-axis direction when the image is displayed on an axes by setting the 'YDir' property to 'reverse.' To invert the y-axis direction, set the 'YDir' property to 'normal', as follows:17. To reverse an axis, you can set the 'XDir' or 'YDir' property of the current axes to 'reverse': set(gca,'XDir','reverse'); %# This flips the x axis. Keep in mind that flipping an axis in this way flips everything in the plot as well. This probably isn't what you want to do for the y axis. You probably just want to flip the y axis labels ...Feb 24, 2017 · subplot (3,1,3) % now plot but put y on x axis instead... plot (y,x) set (gca,'ydir','reverse') % reverse the y axis to match view. title ('Two argument plot & reverse yaxis') The above produces--. Note the last two are identical and that all it takes is using both an x,y vector in plot. One of the sequences goes on the bottom, the other goes on top (from top to bottom), and the y axis is split into two (half for the bottom bars and half for the top bars). The bottom bars use one color, like green, and the top bars use another color, red, and the y axis uses the respective colors on each half on the axis. Example:Axes Appearance. You can customize axes by changing the limits, controlling the locations of the tick marks, formatting the tick labels, or adding grid lines. You also can combine multiple plots, either using separate axes in the same figure, or by combining the plots in the same axes, with the option to add a second y -axis.Reversing y axis direction causes xticks to... Learn more about yaxis reverse, xticks, tick labels, tickdir MATLAB. I just switched from 2015a to 2018b and encounted a problem with the xticks and corresponding labels whenever I invert the y-axis. The Xtick direction seems reversed from the set value (in or out) ...Stop getting in trouble when you go to the dentist. As children, one of the first things we learn about oral health is that if we eat too much candy and/or don’t brush our teeth, w... ….

Potentially easy matlab question here, but I've searched and can't sort out how to do this. I've got a variables, which plot like this: I simple want the x axis to be the y axis and vice versa.Learn more about calling matlab from c++, pcolor, y-axis descending MATLAB I am calling matalb from C++ using MatlabEngine. I have a 2D array of data absCxRes and two vectors timeShift for x-axis and frq for y-axis arma::vec frq = arma::linspace(src1.fs() / longChunk,...You can change the direction of increasing values by setting the associated property to reverse. For example, setting XDir to reverse, set (gca,'XDir','reverse') produces a plot …surf(X,Y,Z) creates a three-dimensional surface plot, which is a three-dimensional surface that has solid edge colors and solid face colors. The function plots the values in matrix Z as heights above a grid in the x - y plane defined by X and Y. The color of the surface varies according to the heights specified by Z. example.plot(x,y) Add another sine wave to the axes using hold on. Keep the current axis limits by setting the limits mode to manual. y2 = 2*sin(x); hold on. axis manual. plot(x,y2) hold off. If you want the axes to choose the appropriate limits, set the limits mode back to automatic.Open in MATLAB Online. Hi everybody, I'm trying to plot the price of an option against time to expiration time in days (in positive integer ofc). But I need to reverse the time.In Matplotlib we can reverse axes of a graph using multiple methods. Most common method is by using invert_xaxis () and invert_yaxis () for the axes objects. …Setting Reverse and Log Properties for an Axis. ( Originally posted on Doug's MATLAB Video Tutorials blog.) This MATLAB video tutorial shows you how to reverse the direction of an aixs or to change an axis to log scale. Recorded: 27 Aug 2010. MATLAB Video Blog.Is there a way I could flip the height to start from zero and also change the position of the plot in the same direction? pts1 = linspace(0, 40, 41); % for heights pts2 = linspace(-25, 70, 96);... Matlab reverse y axis, To update this answer, since it is still a popular Google result: As of R2014a, the correct way to flip the Y axis is the following: >> axis ij This change can be reversed through the following command >> axis ji To flip the X or Z axes, do the following. set(gca,'XDir','reverse'); set(gca,'ZDir','reverse');, The first row of pixels is normally at the top of an image. By default, the IMAGE and IMAGESC functions invert the y-axis direction when the image is displayed on an axes by setting the 'YDir' property to 'reverse.' To invert the y-axis direction, set the 'YDir' property to 'normal', as follows:, Description. B = flipud(A) returns A with its rows flipped in the up-down direction (that is, about a horizontal axis). If A is a column vector, then flipud(A) returns a vector of the same length with the order of its elements reversed. If A is a row vector, then flipud(A) simply returns A. For multidimensional arrays, flipud operates on the ..., The default behavior of imshow is to put the origin of the coordinate system in the upper left corner. This is different from plotting scientific data, such as two entities x and y against each other, where the origin, i.e. the point corresponding to the coordinate (0,0), is in the lower left corner, with the (positive) x-axis extending to the right and the (positive) …, v = axis returns a row vector containing scaling factors for the x -, y -, and z -axis. v has four or six components depending on whether the current axes is 2-D or 3-D, respectively. The returned values are the current axes' XLim, Ylim, and ZLim properties. axis auto sets MATLAB to its default behavior of computing the current axes' limits ..., If you want to reverse a function you may use flip function: Theme. Copy. x = linspace (0,10); y = sin (x); x = flip (x); % reverse the values of x. plot (x,y) If you want to reverse the axes then here is an example code which you may use: Theme., subplot (3,1,3) % now plot but put y on x axis instead... plot (y,x) set (gca,'ydir','reverse') % reverse the y axis to match view. title ('Two argument plot & reverse yaxis') The above produces--. Note the last two are identical and that all it …, MV = 0.1:0.1:0.9; % y- axis. imagesc(RV,MV,RREs); colorbar() The following code works in Matlab. but im wondering if i can do same in latex as latex plots are much nicer. My RREs matrix is 9-by-10 in dimension. Below is my attempt, but it doesnt work. Here is a link to the data file to try. Thanks in advance., I have a function that create the cumulative probability that a certain time is kept (value between 0 and 1 on the Y-axis, and amount of days on the x-axis). Since I know the distance, I thought about adding a secondary x-axis with the average speed that the time correlates to., More specifically, I have 15 daily prices so what I did was building a vector from 0 to 15 and use flipr to reverse the order of my raw vector but it doesn't work because also the price of the option was reversed. Exp = [0:15]; %days to expiration. P = rand (1,15); %fake daily prices. plot (Exp,P) %is all reversed not just the days to expiration., Accepted Answer. You can change the direction of increasing values along the y-axis by setting the YDir property of the Axes object. If you want the values to increase from bottom to top (2-D view), then set the value to 'normal'. Alternatively, if you want the values to decrease from bottom to top, then set the value to 'reverse'., Accepted Answer. Star Strider on 1 Sep 2022. Vote. 0. Link. The y-direction is 'reverse' in image plots, so to correct it: set (gca, 'YDir','normal') ., To update this answer, since it is still a popular Google result: As of R2014a, the correct way to flip the Y axis is the following: >> axis ij. This change can be reversed through the following command. >> axis ji. To flip the X or Z axes, do the following. set(gca,'XDir','reverse'); set(gca,'ZDir','reverse');, Set the yticks using the values in y and modify the yticklabels of the right y-axis accordingly - If the order of labels is expected to be reverse of that is displayed below, flip the variable str to reverse the order ., I have a set of data I want to plot in MATLAB, the problem is that this set of data is all negative. ... plot(1:100, x); %// reverse the direction in which values on y-axis increase set(ah,'ydir','reverse') For more, see axes properties, especially XDir, YDir, and ZDir. Share. Improve this answer. Follow answered Nov 26, 2015 at 8:20. mikkola ..., The following example shows how to exchange the x and y axes of the current figure: X = (1:100)'; %# Create x axis data Y = randn(100, 1); %# Create y axis data plot(X, Y); %# Plot the data view(-90, 90) %# Swap the axes set(gca, 'ydir', 'reverse'); %# Reverse the y-axis (Optional step) Also, a relevant link to Matlab Central is here., Display Axis Lines Through Origin. By default, the x-axis and y-axis appear along the outer bounds of the axes.Change the location of the axis lines so that they cross at the origin point (0,0) by setting the XAxisLocation and YAxisLocation properties of the Axes object. Set XAxisLocation to either 'top', 'bottom', or 'origin'.Set YAxisLocation to either 'left', 'right', or 'origin'., Learn more about axis reverse . ... MATLAB Graphics Formatting and Annotation Labels and Annotations Annotations. Find more on Annotations in Help Center and File Exchange. Tags axis reverse; Community Treasure Hunt. Find the treasures in MATLAB Central and discover how the community can help you!, Learn more about imagecs, reverse axis Hi, How to reverse the Y axis while displaying images with imagesc () function.. I have tried as follows, it does the job, however, reverses the image as well., The first row of pixels is normally at the top of an image. By default, the IMAGE and IMAGESC functions invert the y-axis direction when the image is displayed on an axes by setting the 'YDir' property to 'reverse.' To invert the y-axis direction, set the 'YDir' property to 'normal', as follows:, In the 3D plot I need to reverse the X-axis (f) and Y-axis (K) values in reverse order. Could you please tell me how to do it? 0 Comments. Show -2 older comments Hide -2 older comments. ... Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting!, Specify the minimum y-axis limit as 0 and let MATLAB choose the maximum limit. [X,Y,Z] = peaks; surf(X,Y,Z) ylim([0 inf]) Set Limits for y-Axis with Dates. Open Live Script. Create a horizontal bar chart with dates along the y-axis. Set the y-axis limits to range from June 1, 2014 to June 10, 2014., In order to mesure the flame length, I have to plot axis. I managed to have axis and all, with a custom origin point, but I could not reverse the y axis. Theme. Copy. figure (7);clf; Image = 'input.jpg'; [rows, columns, ColorChannels] = size (Image); origin = [center] % center is a well defined coordinates. xdata = -origin (1): columns - origin ..., Plot Data Against Left y -Axis. Create axes with a y -axis on the left and right sides. The yyaxis left command creates the axes and activates the left side. Subsequent graphics functions, such as plot, target the active side. Plot data against the left y -axis. x = linspace(0,25); y = sin(x/2); yyaxis left. plot(x,y);, The following example shows how to exchange the x and y axes of the current figure: X = (1:100)'; %# Create x axis data Y = randn(100, 1); %# Create y axis data plot(X, Y); %# Plot the data view(-90, 90) %# Swap the axes set(gca, 'ydir', 'reverse'); %# Reverse the y-axis (Optional step) Also, a relevant link to Matlab Central is here., Jun 9, 2010 · Get a Free Trial: https://goo.gl/C2Y9A5Get Pricing Info: https://goo.gl/kDvGHt Ready to Buy: https://goo.gl/vsIeA5 http://blogs.mathworks.com/videos This MAT... , Reverse imagesc y-axis tick marks to go from positive to negative values. 3 ... Flipping images using Matlab. 2 How to reverse the direction of Y-Axis of MatLab figure generated by `imagesc()` function. 1 How to flip the x-axis? 0 Reverse Y-Axis on Axes. 11 Invert the y-axis of an image without flipping the image upside down ..., How to reverse x-axis in a stacked plot. Follow 53 views (last 30 days) Show older comments. ... Open in MATLAB Online. stackedplot is still very limited in capabilities and does not support several features. Manipulating the appearance of X-axis is one of them. Currently, your best bet is to use subplots with few modifications to make it look ..., Open in MATLAB Online. If you want exactly that colormap, but flip it you can do this: Theme. Copy. cmp = colormap; cmp = flipud (cmp); colormap (cmp); You should be able to re-set the colormap to jet in one call: Theme., ytickangle(angle) rotates the y -axis tick labels for the current axes to the specified angle in degrees, where 0 is horizontal. Specify a positive value for counterclockwise rotation or a negative value for clockwise rotation. example. ytickangle(ax,angle) rotates the tick labels for the axes specified by ax instead of the current axes. example., subplot (3,1,3) % now plot but put y on x axis instead... plot (y,x) set (gca,'ydir','reverse') % reverse the y axis to match view. title ('Two argument plot & reverse yaxis') The above produces--. Note the last two are identical and that all it takes is using both an x,y vector in plot., In Matplotlib we can reverse axes of a graph using multiple methods. Most common method is by using invert_xaxis () and invert_yaxis () for the axes objects. Other than that we can also use xlim () and ylim (), and axis () methods for the pyplot object. Method 1: Using invert_xaxis () and invert_yaxis () method., The problem is, I presume, that although your image shows 15 numbers along in each axes, the total size of your image in pixels is 450 x 450 - and this is what imagesc is using.. So, what you really have is an image with 15 x 15 blocks of 30 x 30 pixels.