Convert Nan to zero in fplot

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Spencer Ferguson
Spencer Ferguson 2021-5-21
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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回答（2 个）

Jaya
Jaya 2021-5-22
编辑：Jaya 2021-5-22
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.
Star Strider
Star Strider 2021-5-22
Ran in:
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.
.

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