Vector Newton Raphson Method coding help

Question

Kevin Tovson 2015-11-1

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https://ww2.mathworks.cn/matlabcentral/answers/252197-vector-newton-raphson-method-coding-help

回答： Nitin Khola 2015-11-3

I have a code for the Vector Newton Raphson method (which solves 2 functions that are a function of both x and y) and I am getting the error 'Subscripted assignment dimension mismatch' at line 17 and 18. If anyone has any clue how to fix this problem to where my code runs smoothly I would really appreciate it!

x=15;
y=12;
v=[x;y];
tol=.01;
loopcnt=0;
Maxloop=56;
while loopcnt<Maxloop
      f1t=-sind(x)-sind(x+y);
      f1b=-sind(x+y);
      f2t=cosd(x)+cosd(x+y);
      f2b=cosd(x+y);
      Jacobian=[f1t f1b;f2t f2b];
      f1=cosd(x)+cosd(x+y)-1;
      f2=sind(x)+sind(x+y)-1.1;
      F=[f1;f2];
      vNew=v-inv(Jacobian)*F;
      vNew(1,1)=xNew
      vNew(2,1)=yNew
      xNew=x
      yNew=y
      if (vNew-vOld)>tol
      else 
          break
      end
      loopcnt=loopcnt+1;
  end

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Jan 2015-11-1

编辑：Jan 2015-11-1

Please do not let us guess, which one is the line 17 and 18. But, by the way, it is impossible that the line 18 stops with an error, if the code stops in line 17 already.

The code should stop in the line "vNew(1,1)=xNew" also due to an unknown variable "xNew".

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