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'For' loop for specified integers (more than one)

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Eirini Gk
Eirini Gk 2016-5-10
评论： Stephen23 2016-5-10
Hello, I know that we can use for loop for specified integers like : for v=[1 5 23 99]. But I want to have more than one variable. I have to calculate every iteration in the loop with given initial condition (x,y,a). For example for:[ (x=1,y=0,a=0.2),(x=2,y=1,a=2) ] etc. Can I write it somehow ?

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回答（2 个）

KSSV
KSSV 2016-5-10
P = [1 0 0.2 ; 2 1 2 ] ;
for i = 1:size(P,1)
x = P(i,1) ; y = P(i,2) ; a = P(i,3) ;
end
  1 个评论
Stephen23
Stephen23 2016-5-10
编辑：Stephen23 2016-5-10
Note that you should not use i for variable names, as this is the name of the inbuilt imaginary unit:
http://stackoverflow.com/questions/14790740/using-i-and-j-as-variables-in-matlab
Ditto for j, size, length, etc, etc.
You can use which to check if variable names are already allocated.

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Stephen23
Stephen23 2016-5-10
编辑：Stephen23 2016-5-10
The simplest solution is to use indexing:
X = [1,2,3]
Y = [0,1,2];
A = [0.2,2,20];
for k = 1:numel(A)
x = X(k)
y = Y(k)
a = A(k)
end
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Eirini Gk
Eirini Gk 2016-5-10
One quastion more because Im quite new user of Matlab. If I have a variable s=0 s=s+1 that gets bigger in every iteration if I 'print' a(s) would it appear a(1), a(2) etc. or not ? Thank u very much
Stephen23
Stephen23 2016-5-10
@Eirini Gk: Yes, it is just basic indexing. You just have to keep in mind that MATLAB indexing (like is common in mathematics) starts from one, not zero.

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