How do I plot countours with consistent color map?

Question

Matt Brown 2018-1-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378634-how-do-i-plot-countours-with-consistent-color-map

回答： Matt Brown 2018-1-24

I am trying to generate a set of contour plots. Each plot contains 2 axes showing l/h and r/h data which I want to be able to compare using a single colorbar/colormap. However, I keep getting mismatched colorbars and I m not sure what I am doing wrong. As you can see from the attached plot, my range and ticks match but the colormap is all wonky.

Please advise if you see my error.

Inputs

x = monotonically increasing vector of n x locations

y = monotonically increasing vector of m y locations

p1 = m x n array of l/h pressure values

p2 = m x n array of r/h pressure values

Code

    % Find Plot Limits
    mx=ceil(max(max[p1,p2]));  % find max pressure in l/h and r/h data sets
    mn=floor(min(min([p1,p2])); % find min pressure in l/h and r/h data sets
    delta=(mx-mn)/40; % delta for contour plot
    % Create Figure
    figure1=figure('Color', [1 1 1]);  
    % Axis 1
    axes1=axes('Parent', figure 1,'BoxStyle','full','Layer','top','visible','off'); %create l/h axis
    hold(axes1,'on')
    contour (x,y,p1,[mn:delta:mx],'Fill', 'on');
    set (colorbar, 'Limits', [mn,mx])
    % Axis 2
    axes2=axes('Parent', figure 1,'BoxStyle','full','Layer','top','visible','off'); %create r/h axis
    hold(axes2,'on')
    contour (x,y,p2,[mn:delta:mx],'Fill', 'on');
    set (colorbar, 'Limits', [mn,mx])

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Matt Brown 2018-1-23

I am not sure if I understand your question. I call it twice because I thought I had to set it for each axis/plot. Is this not the case?

You are correct in assuming this is not the real code. I have boiled it down for simplicity. Removed position vectors, annotations, etc... Things that shouldn't affect the contour plot colormap.

Matt Brown 2018-1-23

编辑：Matt Brown 2018-1-23

I went in and commented out the set(colorbar) command. I get the same color map now, but the range and ticks are off. I guess that is what is causing the issue, but I am not sure how to get the end result I am after.

I want to have the same max/min in the colorbar and have the same pressure value correlate to the same color between both plots. I thought specifying [mn:delta:mx] in the contour plot level list would have done that.

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Answer 1

Matt Brown 2018-1-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/378634-how-do-i-plot-countours-with-consistent-color-map#answer_301543

Not sure this is the most elegant way, but rather than plotting things on 2 separate axes I was able to achieve my end goal by putting both contours on one axis and offsetting the y coordinate of the r/h data.