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Finding the nonzero element in a specific row

Asked by Mohammad Mahmoud on 18 Jul 2019
Latest activity Commented on by infinity
on 18 Jul 2019
If i have a matrix and i want to find the indices of a non zero elements in a specific row only how can i do that ?

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2 Answers

Answer by infinity
on 18 Jul 2019
Edited by infinity
on 18 Jul 2019

Hello,
Yes, there is. You can refer this simple example
A = [1 2; 0 3]
[rows,cols,vals] = find(A==0)

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Thank you is there a simple way to make it such that
i determine which row to find
for example in your example
i want to type the row number and it gives me the index(2,2) for the non zero element
hope this clears things up
Hello,
You could see the answer below of @Star

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Answer by Star Strider
on 18 Jul 2019

Select the row, then use find:
A = [1 3 0; 2 0 4; 0 7 9]
DesiredRow = 2
cix = find(A(DesiredRow,:) ~= 0)
so:
A =
1 3 0
2 0 4
0 7 9
DesiredRow =
2
cix =
1 3

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