Section 6: Instrument programming
Model 2651A High Power System SourceMeter® Instrument Reference Manual
6-26
2651A-901-01 Rev. A / March 2011
Example: While
list = {
"One", "Two", "Three", "Four", "Five", "Six"}
print("Count list elements on numeric index:")
element = 1
while list[element] do
print(element, list[element])
element = e 1
end
This loop will exit when
list[element] = nil
.
Output:
Count list elements on
numeric index:
1.00000 One
2.00000 Two
3.00000 Three
4.00000 Four
5.00000 Five
6.00000 Six
Repeat until loops
To repeat a command, you use the
repeat … until
statement. The body of a
repeat
statement
always executes at least once. It stops repeating when the conditions of the until clause are met.
repeat
block
until
expression
Where:
•
block
consists of one or more Lua statements
•
expression
is Lua code that evaluates to either
true
or
false
Example: Repeat until
list = {
"One", "Two", "Three", "Four", "Five", "Six"}
print("Count elements in list using repeat:")
element = 1
repeat
print(element, list[element])
element = e 1
until not list[element]
Output:
Count elements in list
using repeat:
1.00000 One
2.00000 Two
3.00000 Three
4.00000 Four
5.00000 Five
6.00000 Six
For loops
There are two variations of
for
statements supported in Lua: numeric and generic.
NOTE
In a
for
loop, the loop expressions are evaluated once, before the loop starts.
