In an assignment A(I) = B, the number of elements in B and I must be the same.

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Rock Rocky 2014-7-16

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https://ww2.mathworks.cn/matlabcentral/answers/142009-in-an-assignment-a-i-b-the-number-of-elements-in-b-and-i-must-be-the-same

编辑： per isakson 2014-7-16

    p=3;
    L=1000;
    x=rand(1,L);
    r=zeros(p,1);
    W=ones(p,L);
    V=zeros(L,1);
    for k=1:L 
        r=[x(k);r(1:p-1)];
        V(k) = W.'*r;
    end

error In an assignment A(I) = B, the number of elements in B and I must be the same.

| I want to find the value of V(k) which is the result of transpose W times r but I'm getting the above error. would you please tell me how to fix the code. |

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Answer 1

per isakson 2014-7-16

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/142009-in-an-assignment-a-i-b-the-number-of-elements-in-b-and-i-must-be-the-same#answer_145294

See

http://www.mathworks.se/matlabcentral/answers/87710#answer_97292

and start with

put the code in a function (functions are easier to debug)
set dbstop if error
run the function

BTW: V(k) is a scalar

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Rock Rocky 2014-7-16

would you please tell me why I'm getting this error ? BTW when I change W from W=ones(p,L) to W= ones(p,1) the code run well without any error.

per isakson 2014-7-16

编辑：per isakson 2014-7-16

What result do you expect from the code?
Did you try the three steps I proposed?
"run well without any error" . Did you get the expected result?
I guess it errors because &nbsp V(k) is a scalar&nbsp whereas &nbsp W.'*r &nbsp is a column vector