Finding the indices of a max value of a matrix

I have a matrix(1001x251) and i need to find where the maximum value occurs in each row using a for loop and the find function. please help!!

[David Goodmanson]

Hi James,

take a look at the help information for max, specifically the two-output option

[vikal kumar]

use this command

[max,idx]=max(m)

[Walter Roberson]

[max,idx]=max(m, [], 2);

Answer 1

[Chaitanya Bidnur]

The function is max. To obtain the first maximum value you should do

[val, idx] = max(a);

val is the maximum value and idx is its index.

[Walter Roberson]

max() in that form finds the maximum value per column, not per row.

Answer 2

[Walter Roberson]

When you are at the beginning of any row:

• if the row is empty, then the max for the row is empty
• otherwise, initialize a max_seen_so_far variable to the first element of the row. Then for the second element onward, compare the element to max_seen_so_far and replace max_seen_so_far with the element if the element is larger. You can keep track of where that maximum occurred.