# how automatically label multiple outputs in the loop?

조회 수: 3 (최근 30일)
frwmetric 2013년 5월 20일
hi how automatically label multiple outputs in the loop? I do not know it is possible or not... may be it is very basic...
I mean basically
for i=1:3
x=i^2
end
here the outputs
x =
1
x =
4
x =
9
I want to label those x st
x(1)=1
x(2)=4
x(3)=9

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### 답변 (2개)

Dr. Seis 2013년 5월 20일
If you know how many elements in x there will be (3 in your example), then it is best to initialize the output:
x = zeros(3,1); % 3 rows and 1 column of zeros
for i = 1 : 3
x(i) = i^2;
end
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Image Analyst 2013년 5월 20일
You can initialize to the max you ever expect to see, and then truncate later once you know the number of elements you actually need:
% Preallocate space for as many as 3 million elements.
x = zeros(3000000,1); % 3 million rows and 1 column of zeros
for i = 1 : 2000000 % 2 million.
x(i) = i^2;
end
% Truncate to known length of 2 million elements.
x = x(1:2000000);
Iain 2013년 5월 20일
You could also do the loop in the opposite direction. High indices to low indices.

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José-Luis 2013년 5월 20일
편집: José-Luis 2013년 5월 20일
x = 1:3; %Creating a vector of values
your_result = x.^2; %squaring element by element
x(1)
x(2)
x(3)
I would recommend you read the Getting started part of the documentation.

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