Keithley SourceMeter 2600 Series Reference Manual page 110

2-58 TSP Programming Fundamentals Series 2600 System SourceMeters Reference Manual
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Both and and or use short-cut evaluation, that is, they evaluate their second
operand only when necessary. A useful TSL construct is x = x or v , which is
equivalent to:
if not x then x = v end
For example, it sets x to a default value v when x is not set (provided that x is not
set to false ).
To select the maximum of two numbers x and y , use the following statement (note
the and operator has a higher precedence than or ):
max = (x > y) and x or y
When x > y is true, the first expression of the and is true, so the and results in its
second argument x (which is also true, because it is a number), and then the or
expression, results in the value of its first expression, x . When x > y is false, the
expression is false and so are the or results in its second expression, y .
and
The operator not always returns true or false :
print(not nil)
print(not false)
print(not 0)
print(not not nil)
Output of code above:
true
true
false
false
Concatenation
TSL denotes the string concatenation operator by ".." (two dots). If any of its
operands is a number, TSL converts that number to a string:
print( " Hello " .. " World " )
print(0 .. 1)
Output of code above:
Hello World
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2600S-901-01 Rev. A / May 2006 Return to Section 2 topics