System Function T: Difference between revisions

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For example:
For example:


<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;a←⎕T ⋄ ←((¯2+2*63x)/1)⍳0 1 ⋄ ⎕T-a<br />
<apll><pre>
0.00008355929458048195<br />
      a←⎕T ⋄ ←((¯2+2*63x)/1)⍳0 1 ⋄ ⎕T-a
</apll>
0.00008355929458048195


<apll>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;⎕T-⎕T<br />
      ⎕T-⎕T
¯0.0000031892559491097927</apll>
¯0.0000031892559491097927</pre></apll>


<p>As the above examples illustrate, <apll>⎕T</apll> typically provides a very precise way of measuring execution time.</p>
<p>As the above examples illustrate, <apll>⎕T</apll> typically provides a very precise way of measuring execution time.</p>


{{SFN|T}}
{{SFN|T}}

Revision as of 15:48, 16 April 2018

⎕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: 

      a←⎕T ⋄ ←((¯2+2*63x)/1)⍳0 1 ⋄ ⎕T-a
0.00008355929458048195

      ⎕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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