MATLAB Answers

trigonometric non linear equation

1 view (last 30 days)
deepak verma
deepak verma on 23 Apr 2021
Commented: deepak verma on 23 Apr 2021
Trying to solve the nonlinear equation using this code but geeting error :
code :-----------------------------------------------------------------------------------------------
F=@(x) [(Vm/3)*{cos(x(2))-cos(x(1)+pi/3)+1.5*cos(x(1))-1.5*cos(x(2))}-Vdc*{(x(2)-x(1))/2-(2*x(2))/2+(x(1)+pi/3)/1.5}; (Vm/3)*{cos(x(1)+pi/3)-cos(x(2))+cos(x(2)-(2*pi)/3)-cos(x(1)-pi/3)-1.5*cos(x(1)+pi/3)+1.5*cos(x(1))}-Vdc*{(x(1)-x(2)+pi/3)/3-(x(2)-x(1))/2}];
x0=[-1;1];
options=optimoptions('fsolve', 'Display', 'iter');
Error:::-------------------------------------------------------------------------------------------------
Undefined operator '*' for input arguments of type 'cell'.
Error in
@(x)[(Vm/3)*{cos(x(2))-cos(x(1)+pi/3)+1.5*cos(x(1))-1.5*cos(x(2))}-Vdc*{(x(2)-x(1))/2-(2*x(2))/2+(x(1)+pi/3)/1.5};(Vm/3)*{cos(x(1)+pi/3)-cos(x(2))+cos(x(2)-(2*pi)/3)-cos(x(1)-pi/3)-1.5*cos(x(1)+pi/3)+1.5*cos(x(1))}-Vdc*{(x(1)-x(2)+pi/3)/3-(x(2)-x(1))/2}]
Error in fsolve (line 242)
fuser = feval(funfcn{3},x,varargin{:});
  1 Comment
deepak verma
deepak verma on 23 Apr 2021
To get the value of theta 1 and theta2 : Vm=80 and Vdc=72

Sign in to comment.

Accepted Answer

William
William on 23 Apr 2021
I have no idea what this question is about, but I do notice that some of the expressions are surrounded with curly braces { } rather than parentheses ( ). In Matlab, the curly braces indicate a cell-array, and that seems to be causing a problem with the multiplication operator (which cannot be used on cells).
  1 Comment
deepak verma
deepak verma on 23 Apr 2021
thanx solved. Curley braces were the problem

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by