Gaussian using fspecial('gaussian',h,s)

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azarang asadi
azarang asadi on 4 Oct 2019
Answered: Jyothis Gireesh on 7 Oct 2019
Hi,
I'm trying to generate a gaussian with fspecial but I keep on getting the same error:
Error in fspecial (line 8)
LG(i)=fspecial('gaussian',h,s);
Does anybody know what is wrong?
Code:
LG=zeros(20,20);
hsize=[1:20]';
sigma=rand(20,1);
for i=1:20
h=hsize(i);
s=sigma(i);
LG(i)=fspecial('gaussian',h,s);
end

Answers (1)

Jyothis Gireesh
Jyothis Gireesh on 7 Oct 2019
The fspecial('gaussian',h,s) returns a circularly symmetric gaussian function of size h*h. Since the value of h is updated in each iteration of the for loop, the size of the resulting matrix also changes accordingly. The variable LG(i) can only be assigned a scalar value since LG is declared as a 20*20 matrix of zeros. So the assignment may result in a size mismatch between the left and right sides.
It may also be better to replace the fspecial()” function with imgaussfilt()” function which offers the same functionality.
Please go through the following link to get further information on imgaussfilt()”

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