Save FOR loop data into a vector

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Agent Cooper
Agent Cooper 2014-2-13
评论： Agent Cooper 2014-2-13
Dear all,
I am trying to save the data that I get from a FOR loop into a vector. Here is my example:
X = [ -5 1 -2 9 100 -3 ]
for i = X(1:1:end)
if find(0<i & i<10) == 1
Y = i
else Y = NaN
end
end
The above code returns the values after each iteration, separately. I would like them placed into a vector. Could anyone give me a hint on that?

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采纳的回答

Iain
Iain 2014-2-13
You need your for loop to index into X, rather than use X as the index.
for j = 1:numel(X)
i = X(j);
your code as normal...
output(j) = Y;
end

更多回答（1 个）

Jos (10584)
Jos (10584) 2014-2-13
Note that you can loop over elements
X = [1 3 5 2 3 4 1]
Y = zeros(size(X)) ; % pre-allocation makes loops faster
k = 0 ;
for xval = X
k = k + 1 ;
disp(xval)
if xval > 2
Y(k) = 1 ;
end
end
But … matlab can handle vectors/arrays at once, making this much easier!
Y = double(X>2) % X>2 would return a logical array.

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