Models 707B and 708B Switching Matrix Reference Manual
Section 6: Instrument programming
707B-901-01 Rev. A / August 2010
6-25
Example: Else and elseif
Code
x = 1
y = 2
if x and y then
print("'if' expression 2 was not false.")
end
if x or y then
print("'if' expression 3 was not false.")
end
if not x then
print("'if' expression 4 was not false.")
else
print("'if' expression 4 was false.")
end
if x == 10 then
print("x = 10")
elseif y > 2 then
print("y > 2")
else
print("x is not equal to 10, and y is not less than 2.")
end
Output
'if' expression 2 was not false.
'if' expression 3 was not false.
'if' expression 4 was false.
x is not equal to 10, and y is not less than 2.
\
Loop control
If you need to repeat code execution, you can use the Lua
while
,
repeat
, and
for
control
structures. To exit a loop, you can use the
break
keyword.
While loops
To use conditional expressions to determine whether to execute or end a loop, you use
while
loops.
These loops are similar to
(on page 6-24) statements.
while expression do
block
end
Where:
•
expression
is Lua code that evaluates to either
true
or
false
•
block
consists of one or more Lua statements
