MATLAB Programming Fundamentals - MathWorks

X = [1,2,3];

Y = update1(X)

Y =

3 5 7

Nested Functions

A nested function has access to the workspaces of all functions in which it is nested. So,

for example, a nested function can use a variable (in this case, x) that is defined in its

parent function:

function primaryFx

x = 1;

nestedFx

function nestedFx

x = x + 1;

end

end

When parent functions do not use a given variable, the variable remains local to the

nested function. For example, in this version of primaryFx, the two nested functions

have their own versions of x that cannot interact with each other.

function primaryFx

nestedFx1

nestedFx2

function nestedFx1

x = 1;

end

function nestedFx2

x = 2;

end

end

For more information, see “Nested Functions” on page 20-32.

Persistent Variables

When you declare a variable within a function as persistent, the variable retains its value

from one function call to the next. Other local variables retain their value only during the

20 Function Basics