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I want to have a sequence of vectors using the following loop. but when i run the mat lab it will say "Subscripted assignment dimension mismatch." what can i do to index vectors and matrix.

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Dinoma Degefa
Dinoma Degefa 2018-8-31
关闭： MATLAB Answer Bot 2021-8-20
for k=1:100;
x(1)=[1 4 6];
A=[1 3 -1; 2 1 5; 9 7 4];
x(k+1)=A*x(k)
end
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Dinoma Degefa
Dinoma Degefa 2018-8-31
编辑：Dinoma Degefa 2018-8-31
it gives me 100 vectors as k runs from 1 to 100. it is a loop of generating vectors as you can see from the cod. Initial vector x(1) is given and a fixed matrix A. New vector x(k+1) is generated as matrix A multiplied by a vector x(k).

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回答（1 个）

Dennis
Dennis 2018-8-31
There are a few errors in your code:
  1. You try to assign 3 values [1 4 6] to only one field in x. This will not work unless x is a cell or structure.
  2. You try to multiply a 3x3 matrix with a 1x3 matrix, i think there is no mathematical correct way to do this. I am not sure which vector is supposed to be in a 3D space.
  3. This is no error, but if A and x(1) never change there is no need to reassign them in every loop iteration.
I fixed the "Subscripted assignment dimension mismatch" for you. I also swapped A*x{k} to x{k}*A, but this might not be what you want to calculate.
x=cell(101,1);
A=[1 3 -1; 2 1 5; 9 7 4];
x{1}=[1 4 6];
for k=1:100
x{k+1}=x{k}*A;
end
  1 个评论
Dinoma Degefa
Dinoma Degefa 2018-8-31
Sorry, it should be [1;4;6]. Your answer helped me a lot. Indexing is my problem. Matlab is not acceptable when indexing the vector like x(k). Now indexing it by x{k} is ok. thanks a lot.

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