Model 2601B-PULSE System SourceMeter Instrument Reference Manual Section 10: Instrument programming
2601B-PULSE-901-01A April 2020 10-15
Values and variable types
In Lua, you use variables to store values in the runtime environment for later use.
Lua is a dynamically-typed language; the type of the variable is determined by the value that is
assigned to the variable.
Variables in Lua are assumed to be global unless they are explicitly declared to be local. A global
variable is accessible by all commands. Global variables do not exist until they have been assigned
a value.
Variable types
Variables can be one of the following types.
Variable types and values
The type of the value nil, whose main property is
to be different from any other value; usually it
represents the absence of a useful value.
Boolean is the type of the values false and true.
In Lua, both nil and false make a condition
false; any other value makes it true.
All numbers are real numbers; there is no
distinction between integers and floating-point
numbers.
sequence of words or
characters
Functions perform a task or compute and return
values.
New tables are created with { } braces.
For example:
{1, 2, 3.00e0}
Allows arbitrary program data to be stored in Lua
variables.
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