How to return multiple value in matlab?

Question

I want to return two array in this function(newton method). But when I run this script in matlab. It will only return the first array. How should I fix it?

    function [iter errorn]=Newton(func,dfunc,x0)
    i=1;
    solution=fzero(func,x0);
    while abs(x0-solution)>1e-06
      iter(i)=i;
      x0=x0-func(x0)./dfunc(x0);
      errorn(i)=abs(x0-solution);
      i=i+1;
    end
    end

The function is called by:

f1=@(x)x^3-2*x-5;
df1=@(x)3*x^2-2; 
[iter,y1N]=Newton(f1,df1,4)

But MATLAB returns an error: too many arguments

check your function call how much output variable you assign to this function — Karthick Rajan
– Karthick Rajan, Commented Apr 7, 2015 at 7:36
f1=@(x)x^3-2*x-5; df1=@(x)3*x^2-2; [iter,y1N]=Newton(f1,df1,4);this is my function call but matlab has error "too many arguments" I can't figure out why@Karthick Rajan @Santhan Salai — Youwei Zhu
– Youwei Zhu, Commented Apr 7, 2015 at 7:44
the two output arrays are iter and y1N. what more do you want? — Santhan Salai
– Santhan Salai, Commented Apr 7, 2015 at 7:50
@YouweiZhu do you have a variable called "Newton" in the Workspace? Please try which Newton and verify that this is the path to your Newton function. — hbaderts
– hbaderts, Commented Apr 7, 2015 at 7:52

Community · Accepted Answer · 2017-05-23 12:22:07Z

3

Add one more variable to the output of function call. Replace the variable name with the variable name of your problem.

[firstArray, secondArray] = Newton(func,dfunc,x0);

Check if the function is created as a separate function.m file and also it's visible to matlab (in the path).

Also refer to hbaderts comment - Same variable name as function name might override the function.

edited May 23, 2017 at 12:22

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answered Apr 7, 2015 at 7:36

Santhan Salai

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1 Comment

Youwei Zhu Over a year ago

Thanks, realised that matlab won't overwrite existing variable, So I need to change variable name.

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