Problem with Argument and fsolve

조회 수: 6 (최근 30일)
satendra kumar
satendra kumar 2013년 4월 29일
Hi everyone, I am trying to solve:
S= (50625*(arg(x*i + y - 1393 - 746*i) - 3560289735917593/36028797018963968)^2)/pi^2 + ((x + (y - 987)^2 - 24025)^(1/2)/2 - 8643/20)^2 + (3240000*(arg(x*i + y - 259 - 1571*i) + 8955599335723659/288230376151711744)^2)/(169*pi^2) + (90000*(arg(x*i + y - 375 - 629*i) - 3959779706285659/144115188075855872)^2)/pi^2
with fsolve. But i am getting following error message:
'Undefined function 'arg' for input arguments of type 'double'.
Error in myfun (line 2)
F = [((x(1) + (x(2) - 987)^2 - 24025)^(1/2)/2 - 8643/20)/(2*(x(1) + (x(2) - 987)^2 - 24025)^(1/2)) -
(6480000*((17*pi)/60 + arg(x(1)*i + x(2) - 259 - 1571*i))*(imag(x(1)) - real(x(2)) + 259))/(169*pi
Error in fsolve (line 241)
fuser = feval(funfcn{3},x,varargin{:});
Caused by:
Failure in initial user-supplied objective function evaluation. FSOLVE cannot continue.
Please help me out in this. Thanks
  댓글 수: 5
satendra kumar
satendra kumar 2013년 4월 29일
Sorry for the inconvenience, Now i made it correct. Please look into it.
Walter Roberson
Walter Roberson 2013년 4월 29일
? Your current function has no reference to arg(). Are you possibly using matlabFunction() to generate the function in some code you have not shown here? The myfun() you have shown here has no relationship to finding S or Sx or Sy.

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답변 (1개)

Shashank Prasanna
Shashank Prasanna 2013년 4월 29일
Satendra, arg is not a function in MATLAB but you the function 'angle' computes the argument of the complex number which I believe you are trying to find. In your 'S' replace 'arg' with 'angle'
  댓글 수: 1
satendra kumar
satendra kumar 2013년 4월 29일
편집: satendra kumar 2013년 4월 29일
Thanks Shashank, But when i did that i got following error message:
Undefined function 'atan2' for input arguments of type 'sym'.
Error in angle (line 14)
p = atan2(imag(h), real(h));

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