COMP130_Functions

MATLAB^® program files can contain code for more than one function. In a function file, the first function in the file is called the main function,

which must have the same name as the file it is defined in.

• True

• False

What will happen if you define a sub-function with the same name as a built-in function?

• There is an error

• Your sub-function will be used in preference to the built-in function any time it is called within the same file.

• Both the built-in function and your sub-function will be run when the function is called.

• The built-in function will take precedence and your sub-function will be ignored.

Given the following function header:

function f = func(alpha, beta)

Which of the following statements is the best way to invoke the function?

• out = f(5, 6)

• f(5, 6)

• func(5, 6)

• func([5, 6])

• func(5)

Using functions make the program run faster and more efficiently.

• True

• False

The following command can be used to determine the

number of inputs from function cos:

nargin(cos)

• True

• False

What’s the result to the following code?

myfunction = @(x,y) (x + y^2 + x*y);

x=2;

y=1;

z = myfunction(x, y)

What is the command used to change where

MATLAB® looks for function definitions?

Tips for your classmates when writing functions: