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Series 2600B System SourceMeter® instrument Reference Manual Section 8: Instrument programming

2600BS-901-01 Rev. F/August 2021 8-21

Logical operators

The logical operators in Lua are and, or, and not. All logical operators consider both false and

nil as false and anything else as true.

The operator not always returns false or true.

The conjunction operator and returns its first argument if the first argument is false or nil;

otherwise, and returns its second argument. The disjunction operator or returns its first argument if

this value is different from nil and false; otherwise, or returns its second argument. Both and and

or use shortcut evaluation, that is, the second operand is evaluated only if necessary.

The example output you get may vary depending on the data format settings of the instrument.

Example

print(10 or errorqueue.next())

print(nil or "a")

print(nil and 10)

print(false and errorqueue.next())

print(false and nil)

print(false or nil)

print(10 and 20)

1.00000e+01

nil

false

nil

2.00000e+01

String concatenation

String operators

Operator

Description

Concatenates two strings. If either argument is a number, it is coerced to a string (in a

reasonable format) before concatenation.

Example: Concatenation

print(2 .. 3)

print("Hello " .. "World")

Output:

Hello World

Tektronix KEITHLEY 2600B Series User Manual

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