Selecting only some rows of a matrix

Hi, I have a matrix A mxn and I want to select only some of its rows satisfying this criterion: A(i,1)<=1e-03 && A(i,1)>=-1e-03 && A(i,2)<=1e-03 A(i,2)>=-1e-03 && A(i,3:end)<= 1e-03. I can't use loops.

Could you help me? Thanks

Answer 1

[Azzi Abdelmalek]

idx=A(:,1)<=1e-03 & A(:,1)>=-1e-03 & A(:,2)<=1e-03 & A(:,2)>=-1e-03 & all(A(:,3:end)<= 1e-03,2)
B=A(idx,:)

Answer 2

[Simon]

Hi!

So, what is "i"? Did you mean ":"? I assume ":" here.

Start by looking at the first criterion, you can write

crit1 = A(:, 1) <= 1e-3;

This will give you a logical vector. Do the same with the other criterions and combine them.

Hint: For the last criterion the function "all" is useful.

Answer 3

[Andrei Bobrov]

A(all(A(:,1:2) >= -1e-3,2) & all(A <= 1e-3,2),:)