Thank you kind gentlemen for helping me move forward with modern APL.
Am I correct in assuming that expressions such as {⍬≡0⍴⍵} are lambdas?
And that the symbols theta and omega are place holders similar to X and Y in a
user defined function?
(all new stuff to me BTW - but very interesting.)
respect
Peter
On 2014-07-31, at 9:51 PM, Elias Mårtenson <[email protected]> wrote:
> This is the table I have included in the Emacs mode documentation. I got the
> information from the ISO spec, so I hope it's correct:
>
> 0 (1-R⋆2)⋆0.5
> ¯1 arcsin R 1 sin R
> ¯2 arccos R 2 cosin R
> ¯3 arctan R 3 tan R
> ¯4 (R+1)×((R-1)÷R+1)⋆0.5 4 (1+R⋆2)⋆0.5
> ¯5 arcsinh R 5 sinh R
> ¯6 arccosh R 6 cosh R
> ¯7 arctanh R 7 tanh R
> ¯8 -(¯1-R×2)⋆0.5 8 (¯1-R⋆2)⋆0.5
> ¯9 R 9 Real part of R
> ¯10 +R 10 |R
> ¯11 0J1×R 11 Imaginary part of R
> ¯12 ⋆0J1×R 12 Arc R
>
> Regards,
> Elias
>
>
> On 1 August 2014 06:46, David B. Lamkins <[email protected]> wrote:
> Reshape your datum as an empty vector then match to zilde. If the match
> succeeds then your datum is a number; otherwise a character/string.
>
> I believe that there's a circle function to extract the imaginary part
> of a number, if any. You can test for a nonzero imaginary part.
>
> Finally, you can compare a number's floor to the number itself to
> determine whether the value is integer or real.
>
> Not knowing your application, I have to warn you that you shouldn't use
> these tests to infer anything about APL's storage. All of the numeric
> tests are subject to quad-CT.
>
> On Thu, 2014-07-31 at 15:54 -0400, Peter Teeson wrote:
> > I feel pretty stupid.
> > Looked in the APL2 IBM manual but do not understand how to determine the
> > data type of a variable.
> > Neither the primitives nor the Quads sparked the answer in my brain.
> > It must be something pretty obvious but not to me right now.
> >
> > So if I have a function FOO X how do I determine if X is character,
> > integer, float, or imaginary?
> > Assuming that it is not a nested array of course.
> >
> > respect…
> >
> > Peter
> >
>
>
>
>
