MATLAB: How to find a real positive root

fsolverootsolve

How to find only the positive root of the equation x^3-A=0 for each A where A is a parameter varying like 1,2,3,….1000.
If alpha is the root, find the value of alpha/(alpha +1) for each case.

Best Answer

hi, try this essay :
 counter=1;
 for A=1:100
   f=@(x) x^3-A;
   alpha=fzero(f,A);
   if isa(alpha,'complex');
        continue;
  else
  X(counter)=alpha;
  Y(counter)=alpha/(alpha+1);
  counter=counter+1;
 end
 end
 figure, plot(Y);
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