How to label the levels of a fcontour plot?

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TS 2017-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/335456-how-to-label-the-levels-of-a-fcontour-plot

评论： Star Strider 2017-4-15

How to label the levels of a fcontour plot? fcontour does not work with clabel nor has a option such as 'ShowText','on' in contour.

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Answer 1

Star Strider 2017-4-14

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https://ww2.mathworks.cn/matlabcentral/answers/335456-how-to-label-the-levels-of-a-fcontour-plot#answer_263104

在 MATLAB Online 中打开

You must use the contour function to get the contour labels.

Combining fcontour and contour to get the result you want (in figure(2) here) is not difficult. You first need to get the data fcontour creates. You can do that by returning the handle to it, and then accessing its properties.

Using an example from the documentation for fcontour and adapting it to use contour:

syms f(x,y)
f(x,y) = sin(x) + cos(y);
figure(1)
hfc = fcontour(f);
figure(2)
contour(hfc.XData, hfc.YData, hfc.ZData, 'ShowText','on')

Although this takes one more line of code, it will give you the result you want.

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TS 2017-4-15

Thanks for this work arround. Im going to use this for now, but is there no more "elegant" way considering fcontour is pretty much the same function as contour (yet for symbolic). Espacially considering that im opening a dummy figure only to generate the data and dont use it (figure 1). It seems very odd to me that fcontour doenst have "showtext" itself.

Star Strider 2017-4-15

My pleasure.

The two functions have some significant differences. The outputs from fcontour are matrices, while the outputs from contour are the the vectors of (x,y) coordinates for each contour.

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