help to use for loop in four layer

2019 7 5
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更新时间：2019 7 5
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hi
can enyone help me to write following code lines with use of for loops
p & ommega & v matrices are as follow:
v=zeros(6,3);
for i=1:3
v(4:end,i)=1+2*i;
end
ommega=zeros(6,3);
for i=1:3
ommega(4:end,i)=75+25*i;
end
p=zeros(6,3);
for i=1:3
p(4:end,i)=0.1*i;
end

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Stephen23
Stephen23 2019-7-5
编辑：Stephen23 2019-7-5

1 个投票

Without loops:
>> [X,Y,Z] = ndgrid(1:3);
>> A = permute(cat(3,p(:,Z),ommega(:,Y),v(:,X)),[1,3,2]);
And checking with some examples:
>> [p(:,1),ommega(:,1),v(:,1)]
ans =
0 0 0
0 0 0
0 0 0
0.1 100 3
0.1 100 3
0.1 100 3
>> A(:,:,1)
ans =
0 0 0
0 0 0
0 0 0
0.1 100 3
0.1 100 3
0.1 100 3
>> [p(:,1),ommega(:,3),v(:,2)]
ans =
0 0 0
0 0 0
0 0 0
0.1 150 5
0.1 150 5
0.1 150 5
>> A(:,:,8)
ans =
0 0 0
0 0 0
0 0 0
0.1 150 5
0.1 150 5
0.1 150 5
>> [p(:,3),ommega(:,3),v(:,1)]
ans =
0 0 0
0 0 0
0 0 0
0.3 150 3
0.3 150 3
0.3 150 3
>> A(:,:,25)
ans =
0 0 0
0 0 0
0 0 0
0.3 150 3
0.3 150 3
0.3 150 3

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ali alipour
ali alipour 2019-7-5
thank you very much
my problem was solved
but can do this with loops?
Stephen23
Stephen23 2019-7-5
编辑：Stephen23 2019-7-5
"but can do this with loops?"
Of course: preallocate A and then use indexing. You could generate the indices before the loop (e.g. using ndgrid) or inside the loop using division and modulo operations.

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