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Series 2600B

System SourceMeter® Instrument Reference Manual Section 6:

Instrument programming

2600BS-901-01 Rev. B / May 2013 6-19

Example: Concatenation

print(2 .. 3)

print("Hello " .. "World")

Hello World

Operator precedence

Operator precedence in Lua follows the order below (from higher to lower priority):

• ^ (exponentiation)

• not, - (unary)

• *, /

• +, −

• .. (concatenation)

• <, >, <=, >=, ~=, ==

• and

• or

You can use parentheses to change the precedences in an expression. The concatenation ("..") and

exponentiation ("^") operators are right associative. All other binary operators are left associative. The

examples below show equivalent expressions.

Equivalent expressions

reading + offset < testValue/2+0.5

(reading + offset) <

((testValue/2)+0.5)

3+reading^2*4

3+((reading^2)*4)

Rdg < maxRdg and lastRdg <=

expectedRdg

(Rdg < maxRdg) and (lastRdg <=

expectedRdg)

-reading^2

-(reading^2)

reading^testAdjustment^2

reading^(testAdjustment^2)

Conditional branching

Lua uses the if, else, elseif, then, and end keywords to do conditional branching.

Note that in Lua, nil and false are false and everything else is true. Zero (0) is true in Lua.

Keithley 2601B Reference Manual

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