Finding the nonzero element in a specific row

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 ?

Answer 1

[infinity]

Hello,

Yes, there is. You can refer this simple example

A = [1 2; 0 3]
[rows,cols,vals] = find(A==0)

[Mohammad Mahmoud]

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

[infinity]

Hello,

You could see the answer below of @Star

Answer 2

[Star Strider]

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