Can I use a for loop to access different pairs in a matrix?

I want to use a matrix as the input of a for loop, and reference different pairs of indices in the matrix as the variable for each iteration.

Say I have a matrix that looks like

1 4
2 5
3 6

I want the loop to choose [1 4],[1 5] then [1 6], then go back to the first column and choose [2 4], [2,5] and so on.

Is this possible?

Answer 1

[Walter Roberson]

for idxpair = [1 1 1 2 2 2; 4:6 4:6]

That is, when "for" is given an array it iterates over the columns.

Normally though, you would use

for i1 = 1:2
  for i2 = 4:6
    ...
  end
end

Answer 2

[Sean de Wolski]

for ii = 1:3
 for jj = 4:6
   do_stuff_with(ii,jj);
 end
end

What operation are you doing with the two variables. It's possible you could use BSXFUN to do it all with one shot.

[darksideofthemoon101]

I have a for loop that I feed a number of variables. I'm wanting to look at a broad range of data from the variables, so I was looking for something slightly more elegant than a series of nested loops.

What does BSXFUN do?

[Sean de Wolski]

doc bsxfun