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how do you eliminate rows of a matrix?

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Highwayman2
Highwayman2 2015-5-1
回答： Star Strider 2015-5-1
I have a 100x2 matrix of random values and i need to remove any row that has a negative value in it. I originally changed all the positive values to 1 and negative values to 0 by setting the matrix to be > 0, just a bit lost on how to delete the rows with a zero (negative value).
Thanks in advance

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回答（2 个）

the cyclist
the cyclist 2015-5-1
% Some pretend data
A = rand(100,2);
% Identify row with negative values
idx = any(A<0,2);
% Remove them
A(idx,:) = [];
Star Strider
Star Strider 2015-5-1
One possibility:
d = randi(50, 100, 2)-10; % Original Random Matrix
ds = d; % Check Original Matrix
d(any(d<0,2),:) = []; % Rmeove Negative Element Rows
The ‘ds’ assignment preserves ‘d’ so you can check to see that the routine works. It is not necessary for the code.

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