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Root finder matlab code is not displaying result

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Ceyda Elcin Kaya
Ceyda Elcin Kaya on 10 Feb 2019
Edited: Ceyda Elcin Kaya on 10 Feb 2019
I wrote this code below. It works without errors. However I can't see the result.
It finds the nth root of w, starting from guess g.
w=9;
g=5;
n=2;
function result=findRoot(w,g,n)
if (abs(newGuess-g)<(g*0.0001))
result = newGuess;
disp(result);
else
newGuess = (g - g^n - w) / (n*g^(n-1));
result = findRoot(w, newGuess,n);
disp(result);
end
end
I appreciate any help. Thank you.

  2 Comments

Star Strider
Star Strider on 10 Feb 2019
One problem is that you are calling your function from within the function:
result = findRoot(w, newGuess,n);
This will lead to ‘infinite recursion’, and so no output.
Ceyda Elcin Kaya
Ceyda Elcin Kaya on 10 Feb 2019
Out of memory. The likely cause is an infinite recursion within the program.
yep the exact problem I'm facing with right now. I will try to find a solution.
edit: i made it i guess. only problem left is that now it displays infinetely
w=9;
g=5;
n=2;
findRoot(w,g,n);
function [result]=findRoot(w,g,n)
newGuess=0;
while(abs(newGuess-g)>g*0.0001)
newGuess = (g - g^n - w) / (n*g^(n-1));
%result = findRoot(w, newGuess,n);
disp(newGuess)
end
result = newGuess;
disp(newGuess);
end

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Answers (1)

Anand Shirke
Anand Shirke on 10 Feb 2019
Maybe the problem is while declaring the function, I would suggest you to declare the function in this way
function [result]=findRoot(w,g,n)
..
.....
end
After saving the code, type in command window :
findRoot(9,5,2)

  1 Comment

Ceyda Elcin Kaya
Ceyda Elcin Kaya on 10 Feb 2019
I did what you say. Now I'm getting a new error.
Function with duplicate name "findRoot" cannot be defined.
But my function is defined.

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