Convert Nan to zero in fplot

Question

Spencer Ferguson 2021-5-21

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/836503-convert-nan-to-zero-in-fplot

编辑： Jaya 2021-5-22

Is there a way to convert any not a number values that arise in fplot to zero within the fplot function?

Within the error calculation below I get (0-0)/0 at the beginning of the interval, but I'm looking to plot it as zero (since it's zero error).

fplot((((f_disp-u_AB)/u_AB)*100),[0,100],'LineWidth',2,'color','green');

Thanks!

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Answer 1

Jaya 2021-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/836503-convert-nan-to-zero-in-fplot#answer_705603

编辑：Jaya 2021-5-22

在 MATLAB Online 中打开

You can do something like below example to make whatever NaN present in your (((f_disp-u_AB)/u_AB)*100) as 0. The A below can be your (((f_disp-u_AB)/u_AB)*100).

A = 0./[-2 -1 0 1 2]   % gives 0 0 NaN 0 0
A(isnan(A))=0;   % gives 0 0 0 0 0

Will work directly for matrix too.

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Answer 2

Star Strider 2021-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/836503-convert-nan-to-zero-in-fplot#answer_705613

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To plot the first value as 0, the most effective and efficient way to do what you want is to add a very small value (such as eps) to the denominator —

syms u_AB

f_disp = 0;

fplot((((f_disp-u_AB)/(u_AB+eps))*100),[0,100],'LineWidth',2,'color','green')

grid

xlim([0 eps*100]) % Zoom To Show Detail (Delete Later)

The first value is now (0/eps = 0) rather than NaN.

.