System Function T

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⎕T - Return tick count since the operating system was started

The ⎕T system function returns the tick count in units of seconds of the running system. The precision of the result depends upon the operating system and underlying hardware.

⎕T is a niladic function, so it accepts no arguments.

For example, here's an idiom for measuring the execution time of an expression. Replace ... with the expression to be timed: ⎕T-(...)⊢⊢⎕T

      ⎕T-(((¯2+2*63x)/1)⍳0 1)⊢⊢⎕T
0.00004204447031952441
      ⎕T-⎕T
¯0.0000031892559491097927

As the above examples illustrate, ⎕T typically provides a very precise way of measuring execution time.


Note: T is a niladic form system function, you cannot assign a value to it.

System Variables (A value may be assigned to these except for ⎕DM)
ALX CT DM DT ELX FC FEATURE FPC IC IO
LR LX PP PR PW RL SA WSID
Niladic System Functions (a value cannot be assigned to these)
A AV EM ET LC NNAMES NNUMS SI 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 DFT 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 (except for the ⎕A family of functions) are case insensitive


See Also
System Commands System Variables and Functions Operators


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