i'm getting error Error using ga (line 276) Fitness function must be a function handle

Objective function

function z=my_fun(x)

z=x(1)+2*x(2)+56*x(3)+100;

main script

clear all

clc

nvars=3;

LB=[6 2 2];

UB=[100 4 4];

[x, fval]=ga(my_fun,nvars,[],[],[],[],[],[],LB,UB)

when excecuted getting error

Error using ga (line 276)

Fitness function must be a function handle.

Error in start (line 6)

[x, fval]=ga(my_fun,nvars,[],[],[],[],[],[],LB,UB)

please help me by necessary changes to coding.. thank you

Answer 1

[Matt J]

   [x, fval]=ga(@my_fun,nvars,[],[],[],[],[],[],LB,UB)