How can i find the index of a value in a matrix?

I have a matrix event(120x120) and i want know the position of the value 7 in each row (this means that i want know in which column it is). I know that in each row there is the value 7 but with the command "find" it finds the linear indices (ex. if in the position 1,2 there is a 7 with find the ans is 121 but i want that the answer is 2 because it search in each row). for example in the matrix: 1 7 3 4 5 6 7 8 9 8 5 7 2 4 5 6 7 8 if i seach for 7 i want an ans like this: 2 1 5

Answer 1

[M]

In the find command, you can use:

[row,col,v] = find()

or you can use sub2ind and ind2sub functions to convert between subscripts and linear indices.

In your example :

"in the matrix 1 7 3 4 5 6 7 8 9 8 5 7 2 4 5 6 7 " if i seach for 7 i want an ans like this: 2 1 5 .

Why ? Your example is a vector.

[Stefano Sacchetti]

your answer is what I was looking for, thank you!! when i wrote i put in 3 rows (in the preview message it was like [1 7 3 4 5 ; 7 8 9 8 5; 2 4 5 6 7 ]