Matrix dimensions must agree

조회 수: 1 (최근 30일)
Meaghan
Meaghan 2017년 10월 17일
답변: Gautam 2024년 10월 23일
Hi, I am having trouble with solving a system of linear equations. I am getting an error that the matrix dimensions must agree and i cannot divide a/b.
if true
x1=167.48;
x2 = 355.63;
x3 = 355.63;
x4=264.58;
x5=62.93;
x6=167.48;
a= 1000.*(6+.005.*x1)./1.1 ;
b= 1000.*(6+.005.*x2)./1.1 ;
c= 1000.*(6+.005.*x3)./1.1 ;
d= 1000.*(6+.005.*x4)./1.1 ;
e= 1000.*(6+.005.*x5)./1.1;
f= 1000.*(6+.005.*x6)./1.1;
g= (1000.*(6+.005.*x1)/1.1).^-1;
h= (1000.*(6+.005.*x2)/1.1).^-1;
i= (1000.*(6+.005.*x3)/1.1).^-1;
j=(1000.*(6+.005.*x4)/1.1).^-1 ;
k=(1000.*(6+.005.*x5)/1.1).^-1;
l=(1000.*(6+.005.*x6)/1.1).^-1 ;
r = -.0024
a = [1,0,0,0,0,0, 0,0,0,0,0,0, g,0,0,0,0,0 0,0,0,0,0,0;
0,1,0,0,0,0, 0,0,0,0,0,0, 0,h,0,0,0,0 0,0,0,0,0,0;
0,0,1,0,0,0, 0,0,0,0,0,0, 0,0,i,0,0,0 0,0,0,0,0,0;
0,0,0,1,0,0, 0,0,0,0,0,0, 0,0,0,j,0,0 0,0,0,0,0,0;
0,0,0,0,1,0, 0,0,0,0,0,0, 0,0,0,0,k,0 0,0,0,0,0,0;
0,0,0,0,0,1, 0,0,0,0,0,0, 0,0,0,0,0,l 0,0,0,0,0,0;
r,0,0,0,0,0 1,0,0,0,0,0 0,0,0,0,0,0 0,0,0,0,0,0;
0,r,0,0,0,0 0,1,0,0,0,0 0,0,0,0,0,0 0,0,0,0,0,0;
0,0,r,0,0,0 0,0,1,0,0,0 0,0,0,0,0,0 0,0,0,0,0,0;
0,0,0,r,0,0 0,0,0,1,0,0 0,0,0,0,0,0 0,0,0,0,0,0;
0,0,0,0,r,0 0,0,0,0,1,0 0,0,0,0,0,0 0,0,0,0,0,0;
0,0,0,0,0,r 0,0,0,0,0,1 0,0,0,0,0,0 0,0,0,0,0,0;
0,0,0,0,0,0 a,0,0,0,0,0 0,0,0,0,0,0 1,0,0,0,0,0;
0,0,0,0,0,0 0,b,0,0,0,0 0,0,0,0,0,0 0,1,0,0,0,0;
0,0,0,0,0,0 0,0,c,0,0,0 0,0,0,0,0,0 0,0,1,0,0,0;
0,0,0,0,0,0 0,0,0,d,0,0 0,0,0,0,0,0 0,0,0,1,0,0;
0,0,0,0,0,0 0,0,0,0,e,0 0,0,0,0,0,0 0,0,0,0,1,0;
0,0,0,0,0,0 0,0,0,0,0,f 0,0,0,0,0,0 0,0,0,0,0,1;
0,0,0,0,0,0 0,0,0,0,0,0 0,0,0,0,0,0 1,0,0,0,0,-1;
0,0,0,0,0,0 0,0,0,0,0,0 0,0,0,0,0,0 0,1,0,0,0,-1;
0,0,0,0,0,0 0,0,0,0,0,0 0,0,0,0,0,0 0,0,1,0,0,-1;
0,0,0,0,0,0 0,0,0,0,0,0 0,0,0,0,0,0 0,0,0,1,0,-1;
0,0,0,0,0,0 0,0,0,0,0,0 0,0,0,0,0,0 0,0,0,0,1,-1;
0,0,0,0,0,0 0,0,0,0,0,0 1,1,1,1,1,1 0,0,0,0,0,0;];
% 1 2 3 4 5 6 7 8 9 101112131415161718192021222324
b = [0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;0;];
x= size(a)
z = size(b)
y = a/b
end

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답변 (2개)

KSSV
KSSV 2017년 10월 17일
Replace:
y = a/b
with
y = a\b
Gautam
Gautam 2024년 10월 23일
Hello Meaghan,
The reason you get this error is because you cannot divide two matrices the way you divide two scalars.
To find the solution to a system of linear equations, use the “\” operation instead of “/”. Like, “y = a\b”
Hope this helps

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