error in while loop

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Piyanut Nanta
Piyanut Nanta 2015-6-17
编辑： Nicholas Sullivan 2015-6-19
Hi, I want to loop of Jacobi method but error in while loop. help me please
clear all
clc
n=input('Number of equations (n): ');
A=input('Enter the matrix A,2D Matrix: ');
b=input('Enter the matrix b,Column vector: ');
E=input('Permissible error: ');
x0=zeros(1,n);
x=x0;
k=0;
while
k=k+1;
fprintf('%d',k);
for i=1:n
j=1:n
if i~=j
sum=sum+A(i,j)*x(j);
end
x(i)=(b(i)-sum)/A(i,i);
fprintf('%10.5f',x(i));
end
end

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回答（1 个）

Nicholas Sullivan
Nicholas Sullivan 2015-6-17
编辑：Nicholas Sullivan 2015-6-19
I think you might be missing a nested 'for' statement. Instead of
for i=1:n
j=1:n
Write
for i=1:n
for j=1:n
and then add an extra 'end' statement where appropriate.
  2 个评论
Walter Roberson
Walter Roberson 2015-6-18
k will never test equal to k+1 unless k is infinity.
The code was not "while k=k+1", it just looked like that because it was not formatted. Instead it had a 'while" with nothing else on the same line. That needs to be changed to something like
while true
That would create an infinite loop. Possibly along the way some test involving E (permissible error) is intended. The way to calculate the current error is not documented here, though, so no suggestions on that.
Nicholas Sullivan
Nicholas Sullivan 2015-6-19
Thanks for the correction. I wasn't paying attention.

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