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concatenate

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God'sSon
God'sSon 2011-3-28
编辑： Rajeev 2014-5-26
I have a for-loop that executes commands and displays the answer for each iteration. Please, can someone tell me how to concatenate all the answers into an array instead of having the results displayed independently for each iteration. cheers.
  2 个评论
Rajeev
Rajeev 2014-5-26
hey me too searching for the same question did u get the answer?
Rajeev
Rajeev 2014-5-26
编辑：Rajeev 2014-5-26
if u store ur answer in A. then give A as A[ ]; in array form it will store automaticly

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采纳的回答

Walter Roberson
Walter Roberson 2011-3-28
Paulo answered the question as you phrased it, but if you know the exact number of results you are producing (or if the maximum number of results is "reasonably close" to the likely number of results), then you are better off pre-allocating memory for the results:
a = zeros(10,1);
for b = 1:10
a(b) = 3*b+5; %for example
end
When you get to thousands of elements, pre-allocating can be much much faster.
  2 个评论
God'sSon
God'sSon 2011-3-28
thanks for your answer.
I fancy the idea of pre-allocating memory but I couldnt implement it with my code.
consider this example:
a= 2 1 3 1
1 4 1 5
6 7 1 1
8 1 9 1
for i=(1:4)
row=(a(i,:));
b=sort(row)
end
I need an answer which is (b= 4x4 array) like the original (a)
cheers.
Walter Roberson
Walter Roberson 2011-3-28
b = zeros(size(a));
for i = 1:size(a,1)
b(i,:) = sort(a(i,:))
end
Or more simply,
b = sort(a,2);

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更多回答（1 个）

Paulo Silva
Paulo Silva 2011-3-28
a=[]
for b=1:10
a=[a b] %replace the b with the data you want to store per iteration
end
a %result is inside this variable
The code doesn't do any memory pre-allocation!!

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