J3/10-169r1
To: J3
From: Malcolm Cohen/Stan Whitlock
Subject: Interp on Bessel functions.
Date: 2010 June 14
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NUMBER: F08/0019
TITLE: Transformational Bessel functions
KEYWORDS: Intrinsic, Function
DEFECT TYPE: Erratum
STATUS: J3 consideration in progress
QUESTION:
Consider
INTEGER :: n1(10) = 1,n2(2,3,4,5) = 2
...
PRINT *,BESSEL_JN(n1,n2,[1.0,2.0])
The description of BESSEL_JN, transformational version, merely states
that N1 and N2 "shall be of type integer and nonnegative", and for X
merely states that it "shall be of type real". There is no
requirement on rank or conformability.
Is this conforming, and if so, what value(s) should it print?
A similar question applies to BESSEL_YN.
ANSWER:
This was not intended to be conforming. The N1 and N2 arguments
should have been required to be scalar, as should the X argument for
the transformational version of the function. Edits are supplied to
correct this oversight.
A similar answer pertains to the similar question for BESSEL_YN, and
similar edits are supplied.
EDITS to 10-007:
[333:12,13] In 13.7.24p3, lines beginning N1 and N2,
replace "of type integer and nonnegative"
by "an integer scalar with a nonnegative value".
[333:14] In 13.7.24p3, line beginning X, after "real" insert
"; if the function is transformational, X shall be scalar".
[334:12,13] In 13.7.27p3, lines beginning N1 and N2,
replace "of type integer and nonnegative"
by "an integer scalar with a nonnegative value".
[334:14] In 13.7.27p3, line beginning X, after "real" insert
"; if the function is transformational, X shall be scalar".
SUBMITTED BY: Malcolm Cohen
HISTORY: 10-169 m192 F08/0019 submitted
10-169r1 m192 Draft answer
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