Unable to perform assignment because the indices on the left side are not compatible with the size of the right side

Question

Christine 2021-9-12

0
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https://ww2.mathworks.cn/matlabcentral/answers/1451724-unable-to-perform-assignment-because-the-indices-on-the-left-side-are-not-compatible-with-the-size-o

评论： Christine 2021-9-13

%% function
syms x real 
f = x^3*551-x^2*4180+1.2030*10^4*x+4375;
A = readmatrix(char(File));  % matrix A double of 160x100   
B = zeros(160,100); % matrix B of 160x100
    
%% Solve function f to x with given y values from the matrix A and save in B
    parfor i=1:16000
 
        B(i)= double(solve(f==A(i),x));
        
    end 

Using the for loop the error does not occur. Can someone help me? How can I solve this?

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Answer 1

Matt J 2021-9-12

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https://ww2.mathworks.cn/matlabcentral/answers/1451724-unable-to-perform-assignment-because-the-indices-on-the-left-side-are-not-compatible-with-the-size-o#answer_785884

编辑：Matt J 2021-9-12

在 MATLAB Online 中打开

    parfor i=1:16000
 
        tmp=double(solve(f==A(i),x));
        
        if isempty(tmp), 
            warning 'No solutions found.'
            tmp=nan; 
        elseif ~isscalar(tmp)
             warning 'Multiple solutions found.'
            tmp=tmp(1); 
        end
        
        B(i)=tmp;
        
    end 