= SPSS Macro Logic =

SPSS macros offer the following options for '''logic'''.

<<TableOfContents>>

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== Operators ==

The following logical operators are valid for logic control of SPSS macros.

||'''Operator''' ||
||`!EQ`, `=`     ||
||`!NE`, `~=`    ||
||`!GT`, `>`     ||
||`!GE`, `>=`    ||
||`!LT`, `<`     ||
||`!LE`, `<=`    ||
||`!OR`, `|`     ||
||`!AND`, `&`    ||
||`!NOT`, `~`    ||

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== Conditional Processing ==

The `!IF` ... `!THEN` ... `!IFEND` syntax is used for conditional processing inside a macro. `!ELSE` is optional. Further logic can be expressed in nested blocks.

{{{
define !export(type = !tokens(1))
  !IF (!type !EQ "xlsx") !THEN
    save translate /outfile="export.xlsx" /type=xlsx /version=12 /map /replace /fieldnames /cells=values.
  !ELSE
    !IF (!type !EQ "dta") !THEN
      save translate /outfile="export.dta" /type=stata /version=8 /edition=se /map /replace.
    !ELSE
      save outfile="export.sav".
    !IFEND
  !IFEND
!enddefine
}}}

Inside the `!IF` construct, string literals ''can'' be left unquoted. This comes with the unexpected side-effect of case-sensitivity.



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