Asign data with index or something...

Question

0 个投票

Hi, I have the following inputs:

row=[3,7,10]
col=[1,2,3]
data=rand(1,3)
data =
            0.91          0.63          0.10
matrix=zeros(3,3)

And I want to replace the following row in matrix: row 3, coll 7 by 0.81 instead of 0

row 7, coll 2 by 0.63 instead of 0

row 10, coll 3 by 0.1 instead of 0

Any idea?

PS: wihtout loop and the real matrix a much more biger and it need to be dynamic the answer.

Thank you!

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Answer 1

Sean de Wolski 2014-8-21

0 个投票

You've defined matrix to be a 3x3 but want to reference the 7th and 10th row. How big should it be?

If you just want it to be "big enough"

M = zeros(max(row),max(col));
M(sub2ind(size(M),row,col)) = data

Answer 2

Matt J 2014-8-21

0 个投票

matrix = sparse(row,col,data)