Teledyne-lecroy LeCroy Analyzers File Based Decoding Manual Instrukcja Użytkownika Pobierz pdf (Strona 11)

File-based Decoding User Manual Chapter 2: Values

LeCroy Corporation 5

2.2 Variables

Variables are used to store information, or data, that can be modified. A variable can be

thought of as a container that holds a value.

All variables have names. Variable names must contain only alphanumeric characters

and the underscore (

_ ) character, and they cannot begin with a number. Some possible

variable names are

_NewValue

name_2

A variable is created when it is assigned a value. Variables can be of any value type, and

can change type with re-assignment. Values are assigned using the assignment operator

( = ). The name of the variable goes on the left side of the operator, and the value goes

on the right:

x = [ 1, 2, 3 ]

New_value = x

name2 = "Smith"

If a variable is referenced before it is assigned a value, it evaluates to null.

There are two types of variables: global and local.

Global Variables

Global variables are defined outside of the scope of functions. Defining global variables

requires the use of the keyword set. Global variables are visible throughout a file (and

all files that it includes).

set Global = 10;

If an assignment in a function has a global as a left-hand value, a variable is not created,

but the global variable is changed. For example:

set Global = 10;

Function()

{

Global = "cat";

Local = 20;

}

creates a local variable called Local, which is only visible within the function Function.

Additionally, it changes the value of Global to "cat"

, which is visible to all functions.

This also changes its value type from an integer to a string.

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Teledyne-lecroy LeCroy Analyzers File Based Decoding Manual Instrukcja Użytkownika Strona 11