Why do I receive error for reshape function?

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Ryan
Ryan 2021-6-7
评论： Ryan 2021-6-7
I am using the following code below, however, I keep getting geting the error message for reshape function. How would the code or reshape function be changed to stop the error?
>> s = 1/sqrt(2);
A = [1 1 1 0 0 0 0 0 0; 0 0 0 0 0 0 1 1 1; 1 0 0 1 0 0 1 0 0; 0 0 1 0 0 1 0 0 1; s s 0 s 0 0 0 0 0; 0 0 0 0 0 s 0 s s; 0 0 0 s 0 0 s s 0; 0 s s 0 0 s 0 0 0];
b = [6; 24; 12; 18; 4.9497; 16.2634; 13.4350; 7.7781];
k = 1:20;
X = kaczmarz(A,b,k);
figure(1)
for i=1:kmax, subplot(4,5,i), imagesc(reshape(X(:,i),N,N)), end
Error using reshape
Number of elements must not change. Use [] as one of the size inputs
to automatically calculate the appropriate size for that dimension.
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Scott MacKenzie
Scott MacKenzie 2021-6-7
I suspect the issue is that X(:,i) does not have exactly NxN elements.
Ryan
Ryan 2021-6-7
I've checked the size of X:
size(X)
ans =
9 7
>> N*N
ans =
4096
What would I need to change X size to be to get figure(1)?

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KSSV
KSSV 2021-6-7
Ran in:
The number of elements in X(:,j) is not equal to N*N, thats why you are getting error.
N = 3 ;
X = rand(10) ;
x = reshape(X(:,1),N,N) ; % this will lead to error
Error using reshape
Number of elements must not change. Use [] as one of the size inputs to automatically calculate the appropriate size for that dimension.
See to it that the number of elements should not change. You may use imresize to achieve this.
[m,n] = size(X) ;
X = imresize(X,[N*N,n]) ;
imagesc(reshape(X(:,1),N,N)) ; % this will work
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KSSV
KSSV 2021-6-7
It would be because the dimensions (number of rows) in x and X are different. You can change the dimensions of x or use same X as previous.
Ryan
Ryan 2021-6-7
Great! All working now, thanks for the help!

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