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Re: procedure name quirk [message #49075 is a reply to message #49074]

Tue, 13 June 2006 02:44

Foldy Lajos
Messages: 268
Registered: October 2001

Senior Member

Hi,

it's all about identifiers. Variable names, function/procedure names,
structure names are identifiers.

In theory, the IDL 6.3 manual says:

Each identifier must begin with a letter and can contain from 1 to 128
characters. The second and subsequent characters can be letters, digits,
the underscore character, or the dollar sign.

In practice, _ (for _extra) and ! (for system variables) are also
permitted as leading character. (The manual even lists _INIT as
unacceptable variable name, but IDL happily accepts it :-)

A quick check shows that other characters are not accepted:

for i=32b,127b do $
if ( idl_validname(string(i)) ne '' ) then $
print, string(i)

prints only _, ! and letters.

The 8-bit version of this test is left to the reader :-)
just an example:

IDL> Ö=1 ; character 214
IDL> help
% At $MAIN$
V INT = 1

Ö is converted to char 86 (ie highest bit masked).

regards,
lajos

On Tue, 13 Jun 2006, Martin Rother wrote:

> it is possible to write a procedure named '!'.

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[Message index]

		Re: procedure name quirk By: David Fanning on Tue, 13 June 2006 08:03
		Re: procedure name quirk By: rother on Tue, 13 June 2006 07:00
		Re: procedure name quirk By: Foldy Lajos on Tue, 13 June 2006 02:44
		Re: procedure name quirk By: greg michael on Tue, 13 June 2006 01:59
		Re: procedure name quirk By: David Fanning on Mon, 12 June 2006 17:33

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