MATLAB: Hi i stuck in basics of matlab function command

function

clear all

clc

function [z,t]=calc(x,y)

z=x-y;

z=x+y;

i saved this file naming it calc.m but when i am giving input from main window the following error occurs

calc(2,3) % input ??? Error: File: calc.m Line: 3 Column: 1 Function definitions are not permitted in this context.

Delete the "clear all" and "clc"

which -all flip

is likely to indicate that you have your own function or a third party function by that name instead of the built-in function

Only anonymous functions may be defined in the command window:

 >> fun = @(x,y,z)-9*x - 10*y+ z*(-log(100-x-y)-log(x)-log(y)-log(50-x+y));
 >> fun(1,2,3)
 ans =
          -56.599051375363

Other function types (those defined using the keyword function) must be defined in an Mfile.