Creating a simple contour plot / Heat map

Question

Andrew Reibold 2014-8-28

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152662-creating-a-simple-contour-plot-heat-map

编辑： Andrew Reibold 2014-8-28

采纳的回答： Kelly Kearney

在 MATLAB Online 中打开

I have edited this question to try to make it more clear:

As an example, I have the following arrays:

a =  
     1     2     3
     1     2     3
b =  
     2     3     4
     5     6     7
c =  
     3     4     5
     6     7     8

contour(a,b,c) will give me something like this:

I want it to look like this though:

How can I fix this?

PS: Additional Confusion. On the first picture, why does the line go to put a value at (1.5,2.5)? I didnt list an (a,b) of those values together..

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José-Luis 2014-8-28

Are you trying to get isotherms?

Andrew Reibold 2014-8-28

编辑：Andrew Reibold 2014-8-28

If I call the arrays X, Y and Value instead, I just want to make a 'heat map' of Value where each value is at the corresponding 2d location (X,Y)

In the example above, I want the value 70 plotted at (0,10). I want the value 65 plotted at (.01,8) and so on. I want the values displayed via color. Planning for a colorbar on the side.

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Answer 1

Kelly Kearney 2014-8-28

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/152662-creating-a-simple-contour-plot-heat-map#answer_150112

编辑：Kelly Kearney 2014-8-28

在 MATLAB Online 中打开

pcolor(a,b,c);
shading interp;
colorbar;

The contour function plots contour lines, i.e. lines of constant value. Your function is constant across the horizontal, hence the horizontal contour lines. The contourf function would get you a bit closer to what you want, in that it shades between contour lines. But pcolor is best for showing interpolated values between your data points.