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Create a triangular matrix

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stelios loizidis
stelios loizidis on 2 Dec 2021
Edited: Image Analyst on 2 Dec 2021
I have the following issue. I have a matrix A with dimensions 3x500 and I want to calculate the matrix B which is triangular of A. Below is the code I wrote:
% A: 3X500
for i=1:length(B)
for j=1:length(B)
The following error occurs:
Unable to perform assignment because the size of the left side is 1-by-1 and the size of the right side is
How is this problem solved? Your help is important.

Answers (1)

Image Analyst
Image Analyst on 2 Dec 2021
Edited: Image Analyst on 2 Dec 2021
You're subtracting the ith and jth column, which gives a whole column (3 values). Then you're trying to stuff those 3 values into a single location at B(i,j). You can't stuff 3 numbers into a position meant for one number. Not really sure what you want to do so not sure how to fix it.
For triangular matrices, see the functions tril() and triu().


Find more on Operating on Diagonal Matrices in Help Center and File Exchange


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