https://www.jsoftware.com/help/dictionary/dhcapdot.htm
Using
H=: {{(m {{m rf %&(*/) n rf=. {{(,m) ^!.1/ i.@[}}}} n +/ .* (i.@[ ^~
]) % !@i.@[)"0}}
erf=: (1 H 1.5)@*: * 2p_0.5&* % ^@:*:
or
rf=: 1 : '(,m) ^!.1/ i.@[' NB. Rising factorial
L1=: 2 : 'm rf %&(*/) n rf'
L2=: (i.@[ ^~ ]) % !@i.@[
H =: 2 : '(m L1 n +/ . * L2) " 0'
erf=: (1 H 1.5)@*: * 2p_0.5&* % ^@:*:
I get
erf 0.5 1 1.5
| domain error
Apparently the problem is that this version of hypergeometric can only
handle integer arguments (because L2 uses i. which requires integer
arguments).
Does anyone know how to implement the J version 8 of erf?
Thanks,
--
Raul
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