Re: Some questions: built-in operators and exponent markers

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Sorry for the late response, it's been a busy week!

To redefine the built-in operator "!", try this in your Maxima session:
>
> :lisp (remprop '$! 'mheader)
> :lisp (remprop '$! 'led)
>
> and then
>
> postfix ("!");
> x ! :=3D x * %i


I added the lisp commands into my maxima-init.lisp file and it works
perfectly! Thank you so much for this, it's exactly what I was hoping for
on the exclamation mark thing.

Probably, but you probably also want to type =E2=80=9C3.14p0=E2=80=9D and b=
e read it in
> correctly. That=E2=80=99s more work.


Yeah, on the bigfloat exponent marker thing, I was hoping to be able to
type in say 1p0+2p0; and get back either a 3.0p0 or a 3.0b0 (in the latter
case I could just write a function to stringify the output and do a
character substitution on it).

I don't think it's possible to change the exponent marker for
> bigfloats from b to p except for searching the source code (probably
> src/nparse.lisp but possibly elsewhere) for the place where bigfloats
> are parsed, and look for an instance of the characters #\B and #\b,
> and replace them with #\P and #\p. I haven't tried it.



> Maxima already as a compiler builtin, so put your changes in a file and d=
o
> something like:

:lisp (load "/path/new-code.lisp")


If I make an edited copy of src/nparse.lisp where I replace those
characters (or whatever file is responsible for parsing the bigfloats, if
nparse isn't it... I'll assume for now that if a file contains #\B and #\b
it's probably the one I'm looking for, but don't hesitate to enlighten me!)
and then if I include a command in my maxima-init.lisp to load the edited
file, might that work?

Thanks again,
Astrea


On Mon, Jul 13, 2026 at 9:39=E2=80=AFAM Robert Dodier <robert.dodier@gmail.=
com>
wrote:

> To redefine the built-in operator "!", try this in your Maxima session:
>
> :lisp (remprop '$! 'mheader)
> :lisp (remprop '$! 'led)
>
> and then
>
> postfix ("!");
> x ! :=3D x * %i;
>
> Then I get:
>
> x!;
>  =3D> %i*x
>
> 100!;
>  =3D> 100*%i
>
> etc.
>
> You might consider using an otherwise-undefined operator, such as "i".
>
> postfix ("i");
> x i :=3D x * %i;
>
> x i;
>  =3D> x*%i
>
> 100;
>  =3D> 100*%i
>
> I don't think it's possible to change the exponent marker for
> bigfloats from b to p except for searching the source code (probably
> src/nparse.lisp but possibly elsewhere) for the place where bigfloats
> are parsed, and look for an instance of the characters #\B and #\b,
> and replace them with #\P and #\p. I haven't tried it.
>
> Hope this helps,
>
> Robert
>

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<div dir=3D"ltr">Sorry for the late response, it&#39;s been a busy week!<br=
><br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bo=
rder-left:1px solid rgb(204,204,204);padding-left:1ex">To redefine the buil=
t-in operator &quot;!&quot;, try this in your Maxima session:<br><br>:lisp =
(remprop &#39;$! &#39;mheader)<br>:lisp (remprop &#39;$! &#39;led)<br><br>a=
nd then<br><br>postfix (&quot;!&quot;);<br>x ! :=3D x * %i<span style=3D"ba=
ckground-color:transparent">=C2=A0</span></blockquote><br>I added the lisp =
commands into my maxima-init.lisp file and it works perfectly! Thank you so=
 much for this, it&#39;s exactly what I was hoping for on the exclamation m=
ark thing.<br><br><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px=
 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Probabl=
y, but you probably also want to type =E2=80=9C3.14p0=E2=80=9D and be read =
it in correctly. That=E2=80=99s more work.</blockquote><div><br>Yeah, on th=
e bigfloat exponent marker thing, I was hoping to be able to type in say <f=
ont face=3D"monospace">1p0+2p0;</font><font face=3D"arial, sans-serif">=C2=
=A0and get back either a=C2=A0</font><font face=3D"monospace">3.0p0</font><=
font face=3D"arial, sans-serif">=C2=A0or a=C2=A0</font><font face=3D"monosp=
ace">3.0b0</font><font face=3D"arial, sans-serif">=C2=A0(in the latter case=
 I could just write a function to stringify the output and do a character s=
ubstitution on it</font><font face=3D"arial, sans-serif">).</font></div><br=
><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border=
-left:1px solid rgb(204,204,204);padding-left:1ex">I don&#39;t think it&#39=
;s possible to change the exponent marker for<br>bigfloats from b to p exce=
pt for searching the source code (probably<br>src/nparse.lisp but possibly =
elsewhere) for the place where bigfloats<br>are parsed, and look for an ins=
tance of the characters #\B and #\b,<br>and replace them with #\P and #\p. =
I haven&#39;t tried it.</blockquote><div>=C2=A0</div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex"><span style=3D"background-color:transparent">Ma=
xima already as a compiler builtin, so put your changes in a file and do so=
mething like:</span></blockquote><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex"><font face=3D"arial, sans-serif" style=3D"background-color:rgb(255,=
255,255)"><span style=3D"white-space:pre-wrap">:lisp (load &quot;/path/new-=
code.lisp&quot;)</span>=C2=A0</font></blockquote><div><br>If I make an edit=
ed copy of src/nparse.lisp=C2=A0where I replace those characters (or whatev=
er file is responsible for parsing the bigfloats, if nparse isn&#39;t it...=
 I&#39;ll assume for now that if a file contains #\B and #\b it&#39;s proba=
bly the one I&#39;m looking for, but don&#39;t hesitate to enlighten me!)=
=20

 and then if I include a command in my maxima-init.lisp to load the edited =
file, might that work?<br><br>Thanks again,<br>Astrea</div><br></div><br><d=
iv class=3D"gmail_quote gmail_quote_container"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Mon, Jul 13, 2026 at 9:39=E2=80=AFAM Robert Dodier &lt;<a href=
=3D"mailto:[email protected]">[email protected]</a>&gt; wrote:<=
br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex">To redefine the =
built-in operator &quot;!&quot;, try this in your Maxima session:<br>
<br>
:lisp (remprop &#39;$! &#39;mheader)<br>
:lisp (remprop &#39;$! &#39;led)<br>
<br>
and then<br>
<br>
postfix (&quot;!&quot;);<br>
x ! :=3D x * %i;<br>
<br>
Then I get:<br>
<br>
x!;<br>
=C2=A0=3D&gt; %i*x<br>
<br>
100!;<br>
=C2=A0=3D&gt; 100*%i<br>
<br>
etc.<br>
<br>
You might consider using an otherwise-undefined operator, such as &quot;i&q=
uot;.<br>
<br>
postfix (&quot;i&quot;);<br>
x i :=3D x * %i;<br>
<br>
x i;<br>
=C2=A0=3D&gt; x*%i<br>
<br>
100;<br>
=C2=A0=3D&gt; 100*%i<br>
<br>
I don&#39;t think it&#39;s possible to change the exponent marker for<br>
bigfloats from b to p except for searching the source code (probably<br>
src/nparse.lisp but possibly elsewhere) for the place where bigfloats<br>
are parsed, and look for an instance of the characters #\B and #\b,<br>
and replace them with #\P and #\p. I haven&#39;t tried it.<br>
<br>
Hope this helps,<br>
<br>
Robert<br>
</blockquote></div>

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