I have two equations with two variables each is a function of another, so I'm using ''fsolve'' for solving two nonlinear equations. but if I have an equation with a specific constant which I want to give it a range (e.g. 1:50)

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Ahmed Ibrahim 2018-9-3

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评论： Ahmed Ibrahim 2018-9-4

function F = root2d(x,n) 
F(1)= x(1)-1+((1-x(2))^n);
F(2)= (x(2)*(33*(1-2*x(1))+32*x(1)*(1-(2*x(1))^3)))-2*(1-(2*x(1)));
%%%%%%%

I want to obtain the values of two variables x(1),x(2) at each value of n which takes a range (i.e. 1--->50).

How can I do that?

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madhan ravi 2018-9-3

can you elaborate what's x and n? give some examples

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采纳的回答

Stephan 2018-9-3

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Hi,

i guess you are searching for this (rename the outer function or save it as some_stuff_with_n.m in your matlab search path:

function some_stuff_with_n
sol = zeros(50,2);
      for k = 1:50
          n = k;
          sol(k,1:2) = fsolve(@root2d,[1, 1]);
      end
      function F = root2d(x,~)
          F(1) = x(1)-1+((1-x(2))^n); 
          F(2) = (x(2)*(33*(1-2*x(1))+32*x(1)*(1-(2*x(1))^3)))-2*(1-(2*x(1)));
      end
  end

This calculates the function root2d 50x for n=1...50, calculates the x(1) and x(2) values corresponding to this n and saves it in the variable you want. Use:

sol = some_stuff_with_n

to call it.

Best regards

Stephan