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How can i loop a matrix without knowing is size?

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Joana Santos
Joana Santos 2019-3-1
编辑： Joana Santos 2019-3-1
Hello!
So, i'm trying to make a loop where i have a matrix to go through and save their elements in a vector. Just note that i don't know the size of the matrix. So how can i do it?
Thanks!

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Bob Thompson
Bob Thompson 2019-3-1
So, you have two matrices, one outside the loop, and one inside? Which one are you not sure about the size of?
If it is the outside loop you can set the loop bounds to be dependent on the size of the matrix.
for i = 1:size(mat,1) % (mat,1) for rows, (mat,2) for columns and so on
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Bob Thompson
Bob Thompson 2019-3-1
It's your indexing for v. Your i loop only goes from 1:2, so indexing v with (i) will just give you v(1) or v(2). You need to change this to be a combination of i and j.
v((i-1)*size(mat,2)+j) = mat(i,j);
Also, you need to change your dimension your specifying for the innner loop. When you call size() the first input is the matrix, and the second input is the dimension. 1 is rows, 2 is columns, 3 is sheets, etc.
Joana Santos
Joana Santos 2019-3-1
编辑：Joana Santos 2019-3-1
Thank you so much! You helped me a lot :)
Have a nice day xx

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