Plot a fourier transform of a 1x1 sym. WARNING: The following error was reported evaluating the function in FunctionLine update: Unable to convert expression into double array.
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I have a function "J" which depends by the variable "theta".
In particular I have obtained a 1x1 sym value. I can plot this function (the interval is from 0 to 0.6) with fplot that is:
fplot(J, [0 0.6])
It is all ok since I obtain the correct graph.
Now I want to evaluate its Fourier transform. Since J is a 1x1 sym, I used the code "fourier" and not "fft", that is:
Y=fourier(J);
I obtain again a 1X1 sym.
Now I want to plot Y in order to obtain its spectrum, so:
fplot(abs(Y));
Note that I am not considering the normalization, but at the moment it is not the problem since I need only a way to plot a 1x1 sym value.
This is the message:
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.
> In matlab.graphics.function.FunctionLine>getFunction
In matlab.graphics.function.FunctionLine/updateFunction
In matlab.graphics.function.FunctionLine/set.Function_I
In matlab.graphics.function.FunctionLine/set.Function
In matlab.graphics.function.FunctionLine
In fplot>singleFplot (line 232)
In fplot>@(f)singleFplot(cax,{f},limits,extraOpts,args) (line 191)
In fplot>vectorizeFplot (line 191)
In fplot (line 161)
In grafico_delle_densita_di_correnti_theta_unilatero (line 139)
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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