# How can I stop a user defined function from returning the output twice?

2 views (last 30 days)
craig on 22 Mar 2015
Commented: dpb on 23 Mar 2015
The function seems to be looping twice. I cannot see how the code allows this.
Code:
function [ x,solution,logical ] = sim_eq( A,b )
%SIM_EQ solves a system of simultaneous equations.
% Calculate rank and solve
n=input('Input number of unknowns:');
m=input('Input number of equations:');
r1=rank(A);
r2=rank([A b]);
if r1==r2 && r1==n && r2==n
if m>n
display('Overdetermined set of equations. Least-squares fit.');
x=A\b
solution= 'Unique'
logical= 'Approximate'
elseif m==n
x=A\b
solution= 'Unique'
logical= 'Exact'
end
elseif r1==r2 && r1<n && r2<n
x=pinv(A)*b
solution= 'A solution'
logical= 'Exact'
elseif r1~=r2
x= 'No solution'
solution= 'nil'
logical= 'nil'
end
end
##### 3 CommentsShow 1 older commentHide 1 older comment
craig on 23 Mar 2015
Yeah thanks. I read your first statement and within 2 seconds it dawned on me. I thought I wouldn't put semi-colons so it would display. But it displays automatically. duh. I'm tired. Thanks!!
dpb on 23 Mar 2015
I had to format the code and admit I then didn't actually read it...hadn't thought it so simple a question... :)

Ken Atwell on 22 Mar 2015
You don't have semicolons at the end of some lines (so output of those lines will be displayed). Maybe it is running once, but the lack of semicolons is making you think it is running twice?
craig on 23 Mar 2015
Yes thanks. It hit me as soon as I read the previous comment. Can't believe I did that. Thank you!

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