Plot Zero on a Contour Plot

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Amanda 2012-11-27

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https://ww2.mathworks.cn/matlabcentral/answers/54982-plot-zero-on-a-contour-plot

I'm plotting z values, 0 to 10, on a contour plot.

When I include data 1 or greater, I obtain a contour plot. Like the following:

longitude = [80 82 95]
latitude = [30 32 35]
temp = [1 4 6; 1 2 7; 3 5 7]
contourf(longitude,latitude,temp)

Now, I want to plot the ZERO VALUE also on the contour plot. While I was expecting one color representing the zero value, instead I obtained a white square.

 longitude = [80 82 95]
 latitude = [30 32 35]
 temp = [0 0 0; 0 0 0; 0 0 0]
 contourf(longitude,latitude,temp)

Amanda

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Doug Hull 2012-11-27

Where on the original set of temp data is there an isoline of values equal to zero? The answer is nowhere! That is why you are not getting a zero value. In the second example, all the data is zero, so it is a degenerate problem.

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