System Function EX

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⎕EX function available in monadic form.

Monadic Function

Z←⎕EX R expunges or deletes the named object from the APL workspace, similar to )ERASE command. R should be a character string of the function or variable name to delete.
R is a character scalar or vector (function or variable name string).
Z is a scalar number, usually 1. 1 means success, object was deleted. 0 means failed, object not deleted.

Monadic function ⎕EX behaves much the same as described in the Extended APL Standard.

The following deletes variable X from the workspace:

       X←45 99
       ⎕EX 'X'
1
One important difference between ⎕EX and )ERASE is: ⎕EX can be used inside a user function.
See also: )ERASE

System Variables (A value may be assigned to these except for ⎕DM)
ALX CT DM DT ELX FC FEATURE FPC IC IO
LX PP PR PW RL SA WSID
Niladic System Functions (a value cannot be assigned to these)
A AV EM ET LC NNAMES NNUMS SYSID SYSVER T
TC TCBEL TCBS TCESC TCFF TCHT TCLF TCNL TCNUL TS
WA
Monadic or dyadic system functions (a value cannot be assigned to these)
AT CR DC DL DR EA EC ERROR ES EX
FMT FX MF NAPPEND NC NCREATE NERASE NINFO NL NLOCK
NREAD NRENAME NREPLACE NRESIZE NSIZE NTIE NUNTIE STOP TF TRACE
UCS VR
Note that quad functions and variables are case insensitive