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can someone tell me whats wrong with my coding?

1 次查看（过去 30 天）
eri
eri 2012-10-1
关闭： MATLAB Answer Bot 2021-8-20
i make this, and it work just fine clear all clc
load matrix4;
b=a
[x,y]=size (b)
d=999999999999999999999999999999999999999999999999999999999;
for n=1:x
b(n,:) = [ ];
c=det(b*b')
if c<d;
d=c
m=n
end
b=a;
end
small=[d]
row=[m]
but then, when i change the matrix, this message appear
Undefined function or variable 'm'.
Error in mystock (line 18)
row=[m]
can someone help me whats wrong?
  1 个评论
Stephen
Stephen 2012-10-1
that error means that the variable 'm' was never created earlier in the code.

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回答（1 个）

Andrei Bobrov
Andrei Bobrov 2012-10-1
编辑：Andrei Bobrov 2012-10-1
x =size(a,1);
d=inf;
for n=1:x
k = a([1:n-1,n+1:end],:);
c=det(k*k.')
if c < d;
d = c;
row=n;
end
end
small=d;
or
x = size(a,1);
c = zeros(x,1);
for n=1:x
k = a([1:n-1,n+1:end],:);
c(n) = det(k*k.');
end
[small,row] = min(c);

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