Define Interval in contourf

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Georg Söllinger 2017-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/330517-define-interval-in-contourf

回答： Georg Söllinger 2017-4-9

采纳的回答： Star Strider

2017-03-18 09_46_12-Figure 1.png

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Hi all,

I'd like to define the interval, in which contourf plots the lines. I've got data with x-y-z, where the z-values are within [0 1], but I'd like them to appear in levels between [0.5 1]. My attempt was the following:

[c,h] = contourf(meshX1/d_n,meshX2*2/d_n,meshZ,10); % interpolated
        caxis([0.499, 1.001])

resulting in essentially the same line spacing, only the colours are adjusted to the defined interval (see picture).

Anyone having an idea? Thanks in advance!

Georg

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Answer 1

Star Strider 2017-3-18

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See if this works:

v = linspace(0.5, 1, 10);                           % Define ‘10’ Intervals From ‘0.5’ To ‘1’
[c,h] = contourf(meshX1/d_n, meshX2*2/d_n, meshZ, v); % interpolated
        caxis([0.499, 1.001])

Note — I do not have your data so this is UNTESTED CODE. It should work.

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Georg Söllinger 2017-3-18

Thanks for your help! This attempt works. But actually, it is not yet 100% satisfying, as all values below 0.5 and above 1 are now displayed white instead of blue and red respectively. Any solution therefore?

Star Strider 2017-3-18

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My pleasure.

I am guessing here. This adds two contours at the minimum and maximum of ‘meshZ’. I cannot test it, so you will have to test it to see if it works:

v = [min(meshZ(:)) linspace(0.5, 1, 10) max(meshZ(:))];             % Define ‘10’ Intervals From ‘0.5’ To ‘1’

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Answer 2

Georg Söllinger 2017-4-9

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Hi again,

I still have difficulties in defining the Interval. I have attached you the code and the raw data of my plot. The problem is, that if I exclude the Interval (especially for the Total Temperature Plot (4)), the plot is getting really fancy and I cannot find / solve the problem.

Help is really appreciated!! Thanks a lot in advance! Georg