create a vector without for

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vincent lin
vincent lin 2020-1-19
评论： Stephen23 2020-1-19
The vector structure is like [a b c d e f g h i j]
a=1:10
b=1:10
...
j=1:5
vect=[]
I can use for a =1:10
for b=1:10
...
vect = [vect;a.b...j]
end
end
but it looks not elegant. Is there a better way to generate it?
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vincent lin
vincent lin 2020-1-19
Thanks David. My question is a general question and no specific application. I can reduce it to [a b c d] for example.
a=1:10
b=1:10
c=1:3
d=1:5
Total array size is 10*10*3*5. So Yes, I'd like to have possible permutation. I can use for commands but it will need several for. If there're other more compact ways to generate these vectors, that would be good.
Stephen23
Stephen23 2020-1-19
"I'd like to have possible permutation"
Then you should have asked about generating permutations: http://xyproblem.info/

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采纳的回答

Walter Roberson
Walter Roberson 2020-1-19
a=1:10;
b=1:10;
c=1:3;
d=1:5;
[A, B, C, D] = ndgrid(uint8(a), uint8(b), uint8(c), uint8(d)) ;
v = [A(:), B(:), C(:), D(:)] ;

更多回答（1 个）

Image Analyst
Image Analyst 2020-1-19
Try
a = 1 : 10
b = 1 : 10
...
j = 1 : 5
outputVector = [a, b, c, d, e, f, g, h, i, j]

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