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

Question

craig 2015-3-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/184521-how-can-i-stop-a-user-defined-function-from-returning-the-output-twice

评论： dpb 2015-3-23

采纳的回答： Ken Atwell

在 MATLAB Online 中打开

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 个评论
显示 1更早的评论隐藏 1更早的评论

craig 2015-3-23

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 2015-3-23

I had to format the code and admit I then didn't actually read it...hadn't thought it so simple a question... :)

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Ken Atwell 2015-3-22

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/184521-how-can-i-stop-a-user-defined-function-from-returning-the-output-twice#answer_172318

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?