Variable x must be of size [2 1]. It is currently of size [2 2]. Check where the variable is assigned a value.

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Sithum Nanayakkara 2020-5-18

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https://ww2.mathworks.cn/matlabcentral/answers/526335-variable-x-must-be-of-size-2-1-it-is-currently-of-size-2-2-check-where-the-variable-is-assigne

评论： KSSV 2020-5-25

All lines except the 8th comes up as correct but line 8 comes up as incorrect and states the reason "Variable x must be of size [2 1]. It is currently of size [2 2]. Check where the variable is assigned a value."

How can i change this code to get a [2 1] matrix instead of [2 2] ?

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KSSV 2020-5-18

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/526335-variable-x-must-be-of-size-2-1-it-is-currently-of-size-2-2-check-where-the-variable-is-assigne#answer_433127

A = [1 2 4 5 7 ; 9 2 1 4 13] ;
B = [-11 2 ; 3 -1 ; 2 0; 5 11 ; -21 1];
C = A*B ;
D = B*A ;
s = det(C) ; 
t = det(D) ; 
x = inv(C).*[8 -1].^t ; 

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Sithum Nanayakkara 2020-5-25

Here :

D =  [-3,-18,1,-47,3;2,4,2,11,1;1,4,3,10,8;1,32,4,69,5;7,-40,5,-101,-1];
b = [11;3;7;-17;1];
x = linsolve(D,b) ;

KSSV 2020-5-25

clc; clear all ;
D = [-3 -18 1 -47 3 ; 
     2 4 2 11 1 ;
     1 4 3 10 8 ;
     1 32 4 69 5 ;
     7 -40 5 -101 -1] ;
b = [11 ; 3 ;7 ;-17 ;1] ;
x = D\b
     