Series 3700A System Switch/Multimeter Reference Manual Section 10: Instrument programming
3700AS-901-01 Rev. D/June 2018 10-17
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}.
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))
y = false
print(y, type(y))
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.
130 number
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