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Section 10: Instrument programming Series 3700A System Switch/Multimeter Reference Manual

10-18 3700AS-901-01 Rev. D/June 2018

Example: Function

function add_two(first_value,

second_value)

return first_value + second_value

end

print(add_two(3, 4), type(add_two))

7 function

Example: Table

atable = {1, 2, 3, 4}

print(atable, type(atable))

print(atable[1])

print(atable[4])

Defines a table with four numeric

elements.

Note that the "table" value (shown here

as a096cd30) will vary.

table: a096cd30 table

Delete a global variable

To delete a global variable, assign nil to the global variable. This removes the global variable from

the run-time environment.

Functions

With Lua, you can group commands and statements using the function keyword. Functions can

take zero, one, or multiple parameters, and they return zero, one, or multiple values.

You can use functions to form expressions that calculate and return a value. Functions can also act

as statements that execute specific tasks.

Functions are first-class values in Lua. That means that functions can be stored in variables, passed

as arguments to other functions, and returned as results. They can also be stored in tables.

Note that when a function is defined, it is stored in the run-time environment. Like all data that is

stored in the run-time environment, the function persists until it is removed from the run-time

environment, is overwritten, or the instrument is turned off.

Create functions using the function keyword

Functions are created with a message or in Lua code in either of the following forms:

function myFunction(parameterX) functionBody end

myFunction = function (parameterX) functionBody end

Where:

• myFunction: The name of the function.

• parameterX: Parameter names. To use multiple parameters, separate the names with commas.

• functionBody: The code that is executed when the function is called.

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