Series 3700A System Switch/Multimeter Reference Manual
Section 10: Instrument programming
3700AS-901-01 Rev. D/June 2018
10-21
Operators
You can compare and manipulate Lua variables and constants using operators.
Arithmetic operators
Operator
Description
+
addition
-
subtraction
*
multiplication
/
division
-
negation (for example, c =
a)
^
exponentiation
Relational operators
Operator
Description
<
less than
>
greater than
<=
less than or equal
>=
greater than or equal
~=
not equal
==
equal
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)
1.01
a
nil
false
false
nil
2.01
