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| SPSS macros are fundamentally a form of string manipulation, and lack any interface for arithmetic. It is possible to accomplish basic arithmetic through creative use of [[SPSS/Macro/StringFunctions|string functions]]. | SPSS macros do not offer any numeric functions or operators directly, but certain forms of arithmetic can be hacked with [[SPSS/Macro/StringFunctions|string functions]]. |
SPSS Macro Arithmetic
SPSS macros do not offer any numeric functions or operators directly, but certain forms of arithmetic can be hacked with string functions.
Note that the below macros demonstrate how to operate on externally declared macros (e.g. define !year() 2021 !enddefine). If passing a value into a macro as an argument, the !eval() call can be eliminated.
Contents
Addition
!a + 1
define !main()
*Short.
!let !c = !length(!concat(!blanks(!eval(!a)), !blanks(1)))
*Readable.
!let !c = !length(
!concat(
!blanks(!eval(!a)),
!blanks(1)
)
)
!enddefine
!a + !b
define !main()
*Short.
!let !c = !length(!concat(!blanks(!eval(!a)), !blanks(!b)))
*Readable.
!let !c = !length(
!concat(
!blanks(!eval(!a)),
!blanks(!eval(!b))
)
)
!enddefine
Subtraction
!a - 1
define !main()
*Short.
!let !c = !length(!substr(!blanks(!eval(!a)),2))
*Readable.
!let !c = !length(
!substr(
!blanks(!eval(!a)),
2
)
)
!enddefine
!a - !b
define !main()
*Short.
!let !c = !length(!substr(!blanks(!eval(!a)),!length(!concat(!blanks(!eval(!b)),!blanks(1)))))
*Readable.
!let !c = !length(
!substr(
!blanks(!eval(!a)),
!length(
!concat(
!blanks(!eval(!b)),
!blanks(1)
)
)
)
)
!enddefine
Multiplication
!a * !b
define !main()
!let !sum = !blanks(0)
!do !x = 1 !to !eval(!a)
!let !sum = !concat(!sum, !blanks(!eval(!b)))
!doend
!let !c = !length(!sum)
!enddefine