add and remove columns from a marix

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Niki
Niki 2011-9-6
I am writing a code , in fact I have a matrix and I select the fist column then I add next column and in each epoch one column will be adding to the previous for example first 1 , the second epoch 1 and 2 , the third epoch 1, 2 and 3 and so on .
I do that like this
for i = 1:size(Matrix,2) new matrix after each iteration = Matrix(:,1:i);
but now before i put end, I would like to evaluate this new matrix.
I would like to say if nnn> 0.5 then keep this and continue the loop otherwise remove this column from the Matrix and go for the next one and continue the loop
Do you have any idea?

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回答（1 个）

Fangjun Jiang
Fangjun Jiang 2011-9-6
n=rand(5,1);
Matrix=magic(5);
NewMatrix=[];
for k=1:size(Matrix,2)
if n(k)>0.5
NewMatrix(:,end+1)=Matrix(:,k);
end
end
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Fangjun Jiang
Fangjun Jiang 2011-9-7
Sorry, I won't do it. It seems to be a different topic. Ask a different question and someone with statistics expertise might be able to help you.

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