In a different post, I explain how to freeze colors for different colormaps on the same figure. Q.5.101 Discuss why view(-87, 5, 0) basically returns one-color figure. Then display a filled contour plot of Z, letting MATLAB® choose the contour levels. Pass the predefined colormap name, hot, to the colormap function. The second line of code explicitly sets the limits of the color axis. Ccaxis caxis ( C (1),C (2)) The first line of code gets the current limits of the color axis. ![]() Execute the following two lines of code after the first plot is made. Over 15 examples of Contour Plots including changing color, size, log axes, and more in MATLAB. Set the colors for the filled contour plot by changing the colormap. In order to lock the color range after plotting the first matrix, you can use the caxis function. I would rather want to have a colorbar which includes the same contour lines as the plot. EDIT: It works somehow by combining two colormaps, but then the colorbar shows both, which is not what I want. However then I need a legend for the contour lines as well. Incorrect: colorbar('YTick',log(Contours),'YTickLabel',Contours,'FontSize',12) contour command a 2-D plot Q.5.90 What are the coordinates of the highest. Over 15 examples of Contour Plots including changing color, size, log axes, and more in MATLAB. I would rather want the pcolor to be in gray values and the contour lines in colors. Use: colorbar('YTick',log(Contours),'YTickLabel',Contours) Ĭaxis(log()) Ĥ) Make sure the last thing you do is set the Ticks! I've noticed if you have any other commands after this in the colorbar command, it reverts back to something funky.Įxample: Correct: colorbar('FontSize',12,'YTick',log(Contours),'YTickLabel',Contours) I have made a contourf interpolating results with meshgrid and it plots a graph which does not correspond to the values that I put as input with the colors of the colorbar (There are points where it should be yellow or red and it is blue, or other points which have markedly different values and are the same color). To use a different color for each contour line, specify flat. ![]() contourf(log(Data(:,:)),log(Contours)) ģ) Define the tick marks on your colorbar The last step is to make the colorbar show the correct data. Color of contour lines, specified as flat, an RGB triplet, a hexadecimal color code, a color name, or a short name. Specify the colors using a colormap, which uses single numbers to stand for colors on a spectrum.When you use a colormap, C is the same size as Z. Also be sure to take the log of your defined contours so they show up in the right spot. Specify the colors for a surface and a contour plot by including a fourth matrix input, C.The surface plot uses Z for height and C for color. ![]() To reduce the Color edges, you can increase the number of value-steps. For the plot here, I used: Contours= Ģ) Plot your Data Using imagesc, contourf, or some other function, plot the log of your data. Choose the 'smoothness' of the new plot via the parameter newpoints. A quick google search on how to make logarithmic contour plots and logarithmic color-bars yielded some unhelpful results, so I thought I'd give a quick post here.ġ) Define Your Contours Define where you'd like contours. A lot of my data ranges orders of magnitude, and can be very hard to depict using standard MATLAB functions like imagesc, contourf, contour, etc.
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