fplot Warning: Function behaves unexpectedly on array inputs.
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Emmanuel J Rodriguez
am 17 Aug. 2021
Kommentiert: Star Strider
am 17 Aug. 2021
Hello! This SHOULD be a simple fix, and I've spent some time reading answers to similar question.... but still can't manage to find a fix. I'm trying to use fplot to plot lift as a function of length L.
% Lift load
syms q_l ka L x
q_l = ka.*sqrt(L.^2 - x.^2) % Expression for load distribution function
% Integrate expression over the length of wing to calc total load acting on
% wing due to lift
lift = int(q_l,0,L)
lift = subs(lift,ka,150)
% Plot lift as a function of wing length
fplot(@(L) lift,[10 20])
I get the following warnings (no curve is plotted):
Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.
Warning: Error updating FunctionLine.
The following error was reported evaluating the function in FunctionLine update: Unable to convert expression into double array.
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Star Strider
am 17 Aug. 2021
The ‘lift’ funciton is symbolic, so no function handle is necessary to plot it with fplot. (If you want to create a funciton handle from it, use the matlabFunction function.)
% Lift load
syms q_l ka L x
q_l = ka.*sqrt(L.^2 - x.^2) % Expression for load distribution function
% Integrate expression over the length of wing to calc total load acting on
% wing due to lift
lift = int(q_l,0,L)
lift = subs(lift,ka,150)
% Plot lift as a function of wing length
fplot(lift,[10 20])
.
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