MATLAB: Delete rows in a matrix that contain ONLY a negative number

delete rowslarge matrixnegative numbers in a row

Hello

I've got a really large matrix (say 2000 x 3000) and I want to delete the rows that contain ONLY the negative number -999.

For example, I've got A = [5 3 -999 ; -999 -999 -999; 4 1 7 ; -999 -999 -999]

and I want my new matrix to be A = [5 3 -999 ; 4 1 7]

How can I do that?

Thanks!

Best Answer

idx = all(A == -999, 2);
A(idx, :) = [];

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A = [1 2 3 4 5; 6 7 8 9 10]
B=A
B(A>3)=-999

MATLAB: I am trying to find the euclidean distance of 2 vector with different sizes

I'm also not clear on what you're asking. If you want to find the euclidean distance between each row of T and each row of X, then this is easily done:

T = [
    5.1000    3.5000    1.4000    0.2000
    6.4000    3.2000    4.5000    1.5000
    5.4000    3.4000    1.7000    0.2000
    5.7000    2.8000    4.5000    1.3000
    5.7000    4.4000    1.5000    0.4000
    5.6000    2.9000    3.6000    1.3000];
X = [
    5.5000    3.8000    1.9000    0.4000
    6.4000    2.9000    4.3000    1.3000
    4.3000    3.0000    1.1000    0.1000
    5.4000    3.0000    4.5000    1.5000];
distance = sqrt(sum((permute(T, [1 3 2]) - permute(X, [3 1 2])) .^ 2, 3))

distance(r, c) is then the distance between T(r, :) and X(c, :)

Best Answer

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MATLAB: How to create a new variable after replacing some data from old variable

MATLAB: I am trying to find the euclidean distance of 2 vector with different sizes

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