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How to store output of iterative statement to a matrix?

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Rahman
Rahman 2012-11-21
I have the following code segment
numRows=size(rulesTable,1);
fluCertainity=[-1 100 100 75 20 25 80];
for i=1:numRows
if rulesTable(i,1)==headache && rulesTable(i,2)==temperature
CF=fluCertainity(i)
end
end
Question: I want to store the fluCertainity value into the matrix 'CF' if the condition is true. How can I take CF as a matrix to store all the values from fluCertainity in case of true cases?
Thanks in advance. Rahman Ali
[EDITED, code formatted, Jan]

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Jan
Jan 2012-11-21
编辑：Jan 2012-11-21
k = 0;
CF = zeros(numRows); % Pre-allocate
for i=1:numRows
if <your condition>
k = k + 1;
CF(k) = fluCertainity(i);
end
end
CF = CF(1:k); % Crop unneded memory
Or vectorized - no need for a loop:
index = (rulesTable(:,1)==headache & rulesTable(:,2)==temperature);
CF = fluCertainity(index);

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