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How to fix "Subscripted assignment dimension mismatch," in a for loop?

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Alec Carruthers
Alec Carruthers 2018 年 4 月 11 日
コメント済み: Alec Carruthers 2018 年 4 月 11 日
for k=1:length(index)
syms w
W_TO(k) = vpasolve(((C1(k)+C5(k))*(w^1.195))+(C2*(w^.235))+((C3+C4(k)+C6(k)+C7+C10-1)*w)+(C8+C9)==0,w);
end
The error message I get it is: "Subscripted assignment dimension mismatch.
Error in sym/privsubsasgn (line 1107) L_tilde2 = builtin('subsasgn',L_tilde,struct('type','()','subs',{varargin}),R_tilde);
Error in sym/subsasgn (line 944) C = privsubsasgn(L,R,inds{:});
Error in Weight (line 250) W_TO(k) = vpasolve(((C1(k)+C5(k))*(w^1.195))+(C2*(w^.235))+((C3+C4(k)+C6(k)+C7+C10-1)*w)+(C8+C9)==0,w);"
For each k value, I should be getting one value for W_TO. My guess is that there is no analytical solution to this expression. I would appreciate the advice anyone can give on fixing this issue.

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回答 (1 件)

Star Strider
Star Strider 2018 年 4 月 11 日
I cannot run your code because I do not have the constants.
Your guess may be correct. However saving ‘W_TO’ as a cell array instead may at least prevent the error your code is currently throwing:
W_TO{k} = vpasolve(((C1(k)+C5(k))*(w^1.195))+(C2*(w^.235))+((C3+C4(k)+C6(k)+C7+C10-1)*w)+(C8+C9)==0,w);
You can sort out any multiple results for each ‘k’ iteration after the loop completes.

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Alec Carruthers
Alec Carruthers 2018 年 4 月 11 日
You are right about using a cell array for "W_TO" because that fixed the issue. However, now I get three outputs of "[]"? Im not sure what that means.
Walter Roberson
Walter Roberson 2018 年 4 月 11 日
MATLAB was not able to find numeric solutions for those three cases. Possibly they do not exist, or possibly it is just too hard for MATLAB.
Alec Carruthers
Alec Carruthers 2018 年 4 月 11 日
Alright, that is what I was thinking.
Thank You!

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