fsolve will not work on my machine

I have been trying to get fsolve to work on my personal computer. I have tried many different problems and all come out with the same error. "Error using fsolve. Too many input arguments." I have ultimately dumbed down my problem to solve to the code at the end to make sure it isn't a coding error. This code works perfectly on the school's computer but not on my own. I have checked and I do have the optimization toolbox installed. Other functions in the optimization toolbox work, such as fmincon. I have tried uninstalling and reinstalling the optimization toolbox. I have also uninstalled and reinstalled matlab. I am using version 2018b but have also tried using 2017b on my personal computer but neither work. Is there something that I am missing. This is a fairly straight forward function.

Thanks for your help.

clc;
x0=0;

x=fsolve(@test,x0);

function F=test(x)
    F=2*x+1;
end

[Matt J]

Odd. Well, show us the result that you see when doing

>> which -all fsolve

[Adam Danz]

Even going back to r2006a, fsolve() has always allowed up to 3 inputs. So that rule out one possibility.

Perhaps you have a different function on your matlab path named fsolve()? To check that run this line. If you have more than 1 file named fsolve() it will appear in the output.

which fsolve -all
% C:\Program Files\MATLAB\R2018a\toolbox\optim\optim\fsolve.m

[Justin Becker]

The output I get from the above code is below.

Apparently there was a file I didn't know about called fsolve that it was trying to run. Thanks for your help guys!

Error using fsolve
Too many input arguments.

Error in myFunction (line 4)
x=fsolve(@test,x0);

[Adam Danz]

Nice! Either re-name the other fsolve() function or remove its path prior to calling the built-in fsolve() function.

rmpath('C:\Users\name\Documents\MATLAB\myPoorlyNamedFunctions\fsolve.m')

Answer 1

[KALYAN ACHARJYA]

Do the following;

1. Save the function named as test.m

function F=test(x)
    F=2*x+1;
end

2. Call the function from different main script or command window

clc;
x0=0;
x=fsolve(@(x) test(x),x0); 

There may be same function name conflict, so change the function name in all three position.

1. Change function name
2. Change in save Matlab file name
3. During Call the function name

All must be tthe same name.

Or

As @Adam suggested to avoid the conflict the file name with inbuilt function (fsolve)

Hope it Helps!