Help with an "unknown" APL2 symbol
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Help with an "unknown" APL2 symbol

Help ! While trying to adapt for APL+WIN a function written in APL2, from a
barely legible faxed sheet, I met that symbol that looks like the capital
letter "O" or the APL  symbol for PI. Actually, the expression is : TxO.iota
N, where T and N are scalars, and "x" stands for the multiply sign.  It
looks like an outer product. Anybody knows what that symbol means in APL2,
or is it just a quirk due to the fax machine ? Thanks. Pierre Windal.

Tue, 11 Mar 2003 03:00:00 GMT
Help with an "unknown" APL2 symbol

Quote:

> Help ! While trying to adapt for APL+WIN a function written in APL2, from a
> barely legible faxed sheet, I met that symbol that looks like the capital
> letter "O" or the APL  symbol for PI. Actually, the expression is : TxO.iota
> N, where T and N are scalars, and "x" stands for the multiply sign.  It

I think you have a fax problem.  T{times}{circle}.{iota}Z and
T{times}{nul}.{iota}Z are both invalud expressions in APL2.  Note:
{circle} is the large circle (pi when monadic) and {nul} is the small
circle (as used in outer product).

What is the expression supposed to do?

Ted

Thu, 13 Mar 2003 03:00:00 GMT
Help with an "unknown" APL2 symbol

Quote:
> > letter "O" or the APL  symbol for PI. Actually, the expression is : TxO.iota
> > N, where T and N are scalars, and "x" stands for the multiply sign.  It
> I think you have a fax problem.  T{times}{circle}.{iota}Z and

A further thought:  perhaps the "." is a fax artifact.  If so, the
expresion becomes T{times}{pi-times}{iota}N to give T times intergral
multiples of pi.  Such an expression arises frequently in anything to do
with spectra.

Ted

Fri, 14 Mar 2003 03:00:00 GMT

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