Re: [q-lang-users] improvement to Q
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Re: [q-lang-users] improvement to Q
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From: <ed...@ri...> - 2007-06-28 00:57:37
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<P><BR>
Ok :) I promise I looked for this function. I guess I overlooked it many ti=
mes. I wonder what other goodies I've overlooked many times?</P>=0D
<P>Eddie<BR>
<BR>
<BR>
<B>On Wed Jun 27 18:52 , Albert Graef <Dr....@t-...> sent:<BR>
<BR>
</P></B>=0D
<BLOCKQUOTE style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5p=
x; BORDER-LEFT: #f5f5f5 2px solid; MARGIN-RIGHT: 0px"><A href=3D"javascript=
:top.opencompose('ed...@ri...','','','')">ed...@ri...=
</A> wrote:<BR>
<FONT color=3Dred>> I hope other Q users don't boo me but, I would like =
to see x^n return</FONT><BR>
<FONT color=3Dred>> integer results when x is an integer and n is a natu=
ral number. Maybe</FONT><BR>
<FONT color=3Dred>> even return a rational when n is a negative integer.=
</FONT><BR>
<BR>
The pow function already does this:<BR>
<BR>
=3D=3D> whos pow<BR>
<BR>
pow external function symbol defined in /usr/share/q/lib/clib.q<BR>
pow X1 X2<BR>
<BR>
=3D=3D> pow 2 64<BR>
18446744073709551616<BR>
<BR>
=3D=3D> pow 2 (-2)<BR>
1%4<BR>
<BR>
=3D=3D> pow (2%3) (-2)<BR>
9%4<BR>
<BR>
So if you prefer to have this as an operator, simply define:<BR>
<BR>
public (^^) X Y @ (^);<BR>
<BR>
X:Num^^Y:Num =3D Z where Z:Num =3D pow X Y;<BR>
<BR>
If you want to have the operator work with floats as well, just add:<BR>
<BR>
X:Num^^Y:Num =3D Z where Z:Num =3D X^Y;<BR>
<BR>
A while ago there was a heated discussion over whether (^) should<BR>
provide that functionality but, as John already pointed out, it's really<BR>
better to have two different operations here, for various reasons.<BR>
<BR>
Albert<BR>
<BR>
-- <BR>
Dr. Albert Gr"af<BR>
Dept. of Music-Informatics, University of Mainz, Germany<BR>
Email: <A href=3D"javascript:top.opencompose('Dr....@t-...','','','=
')">Dr....@t-...</A>, <A href=3D"javascript:top.opencompose('ag@muw=
iinfa.geschichte.uni-mainz.de','','','')">ag...@mu...schichte.uni-mainz.=
de</A><BR>
WWW: <A href=3D"parse.pl?redirect=3Dhttp%3A%2F%2Fwww.musikinformatik.uni-ma=
inz.de%2Fag" target=3D_blank><FONT color=3Dred>http://www.musikinformatik.u=
ni-mainz.de/ag</FONT></A><BR>
</BLOCKQUOTE>=0D
</html><BR>=
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