Matlab Error (Matrix dimensions must agree)
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xOld =input('Enter initial guess: ');
errortmp =2;
counter =0;
while (errortmp>10^-10)
xNew =xOld - Jf3(xOld)\f3(xOld)
counter=counter+1
error=norm(xNew-xOld,inf)+4*eps*norm(xNew,inf)
if(error>=errortmp)
error('shit!');
else
errortmp=error;
end
xOld = xNew;
pause
end
function J=Jf3(x)
J=[0 0 1 1;
x(3) x(4) x(1) x(2);
2*x(3)*x(1) 2*x(4)*(x(2)) x(1)^2 x(2)^2;
3*x(3)*x(1)^2 3*x(4)*(x(2))^2 x(1)^3 x(2)^3];
function y=f3(x)
y=[x(3)+x(4)-2;
x(3)*x(1) + x(4)*x(2);
x(3)*x(1)^2 + x(4)*x(2)^2 - (2/3);
x(3)*x(1)^3 + x(4)*x(2)^3];
end
//当用户输入数值时,一定要输入一个matrix,不能只输入一个数值,否则会显示:Matrix dimensions must agree
输入 1; //这时我们输入的只是一个数字
输入 1 2 2 3; //这时我们输入的并不是matrix
输入 [1 2 3 4 ] //这时我们输入的也不是matrix
输入 [1;2;3;4] //正确
这是因为,输入的值的形式和函数处理的形式是不一样的,所以会显示该代码的错误
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