Keithley 2601B Reference Manual

Section
6: Instrument programming Series 2600B System SourceMeter® Instrument
Reference Manual
6-14 2600BS-901-01 Rev. B / May 2013
Variable types
Variables can be one of the following types.
Variable types and values
Variable type returned Value Notes
"nil"
not declared
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"
true or false
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
.
"number"
number
All numbers are real numbers; there
is no distinction between integers
and floating-point numbers.
"string"
sequence of words or
characters
"function"
a block of code
Functions perform a task or compute
and return values.
"table"
an array New tables are created with { }
braces. For example,
{1, 2, 3.00e0}.
To determine the type of a variable, you can call the type() function, as shown in the examples
below.
The output you get from these examples may vary depending on the data format that is set.
Example: Nil
x = nil
print(x, type(x))
nil nil
Example: Boolean
y = false
print(y, type(y))
false boolean
Example: String and number
x = "123"
print(x, type(x))
x = x + 7
print(x, type(x))
123 string
Adding a number to x forces its type to
number.
1.30 number

Keithley 2601B Specifications

General

Brand	Keithley
Model	2601B
Category	Measuring Instruments
Language	English