PDL::AutoLoader(3pm)

1AutoLoader(3)         User Contributed Perl Documentation        AutoLoader(3)
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NAME

6       PDL::AutoLoader - MatLab style AutoLoader for PDL
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SYNOPSIS

9        use PDL::AutoLoader;
10        $a = func1(...);   # Load file func1.pdl
11        $b = func2(...);   # Load file func2.pdl
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13        $PDL::AutoLoader::Rescan = 1; # Enable re-scanning
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DESCRIPTION

16       This module implements a MatLab style AutoLoader for PDL. If an unknown
17       function "func()" is called, PDL looks for a file called "func.pdl".
18       If it finds one, it compiles the file and calls the function "func".
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20       The list of directories to search in is given by the shell environment
21       variable "PDLLIB". This is a colon-separated list of directories. On
22       MSWindows systems, is it a semicolon -separated list of directories.
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24       For example, in csh:
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26         setenv PDLLIB "/home/joe/pdllib:/local/pdllib"
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28       Note: This variable is unrelated to Perl's "PERL5LIB".
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30       If you add a leading '+' on a directory name, PDL will search the
31       entire directory tree below that point. Internally, PDL stores the
32       directory list in the variable @PDLLIB, which can be modified at run
33       time.
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35       For example, in csh:
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37         setenv PDLLIB "+/home/joe/PDL"
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39       will search /home/joe/PDL and all its subdirectories for .pdl files.
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41   AUTO-SCANNING
42       The variable $PDL::AutoLoader::Rescan controls whether files are
43       automatically re-scanned for changes at the "perldl" or "pdl2" command
44       line.
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46       If "$PDL::AutoLoader::Rescan == 1" and the file is changed then the new
47       definition is reloaded auto-matically before executing the "perldl" or
48       "pdl2" command line. Which means in practice you can edit files, save
49       changes and have "perldl" or "pdl2" see the changes automatically.
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51       The default is '0' - i.e. to have this feature disabled.
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53       As this feature is only pertinent to the PDL shell it imposes no
54       overhead on PDL scripts. Yes Bob you can have your cake and eat it too!
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56       Note: files are only re-evaled if they are determined to have been
57       changed according to their date/time stamp.
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59       No doubt this interface could be improved upon some more. :-)
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61   Sample file:
62        sub foo { # file 'foo.pdl' - define the 'foo' function
63          my $x=shift;
64          return sqrt($x**2 + $x**3 + 2);
65        }
66        1; # File returns true (i.e. loaded successfully)
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AUTHOR

69       Copyright(C) 1997 Karl Glazebrook (kgb@aaoepp.aao.gov.au); several
70       extensions by Craig DeForest (deforest@boulder.swri.edu) All rights
71       reserved. There is no warranty. You are allowed to redistribute this
72       software / documentation under certain conditions. For details, see the
73       file COPYING in the PDL distribution. If this file is separated from
74       the PDL distribution, the copyright notice should be included in the
75       file.
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BUGS

78       No doubt this interface could be improved upon some more. :-)
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80       Will probably be quite slow if "$PDL::AutoLoader::Rescan == 1" and
81       thousands of functions have been autoloaded.
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83       There could be a race condition in which the file changes while the
84       internal autoloader code is being executed but it should be harmless.
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86       Probably has not been tested enough!
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NAME

SYNOPSIS

DESCRIPTION

AUTHOR

BUGS

SEE ALSO