HDF(3)

NAME
PDL::IO::HDF - A PDL interface to the HDF4 library.

SYNOPSIS
  use PDL;
  use PDL::IO::HDF;

  # Open file 'foo.hdf' with all hdf interface:
  my $HDF = PDL::IO::HDF->new("foo.hdf");

  # You can call functions from either the SD or VS interfaces:
  $HDF->{SD}->SDget("Foo_data");
  $HDF->{VS}->VSgetnames();

  # To close the file:
  $HDF->close();

DESCRIPTION
This library provides functions to manipulate HDF files with the SD, VS, and V HDF interfaces.

For more information on HDF, see http://hdf.ncsa.uiuc.edu/

The 'new' function of this package uses the 'new' functions for the individual HDF interfaces. This allows you to use all of the interfaces at one time (if you don't mind the extended syntax).

Actually using the HDF files comes down to using one of the particular interfaces, for that see the docs on those modules.

CONSTANTS
These constants are now implemented using the perl 'use constant' pragma.

Previously, they were just scalars that were changeable (which is a no-no).

See constant(1) for more info on how to use these in your code.

  Access Modes

DFACC_READ
    Open the file in read-only mode.

DFACC_WRITE
    Open the file in write-only mode.

DFACC_CREATE
    Clobber the file (create it if it doesn't exist, and then open with RW mode).

DFACC_ALL
    Open the file in read-write mode.

DFACC_RDONLY
    Same as DFACC_READ

DFACC_RDWR
    Open the file in read-write mode.

  VS Interface Interlacing Modes

FULL_INTERLACE
NO_INTERLACE

  HDF4 Data Type Codes:

DFNT_UCHAR
    HDF's unsigned char ~= PDL's byte

DFNT_CHAR
    HDF's char ~= PDL's byte

DFNT_FLOAT32
    HDF's 32-bit float ~= PDL's float

DFNT_FLOAT64
    HDF's 64-bit float ~= PDL's double

DFNT_INT8
    HDF's 8-bit integer ~= PDL's byte

DFNT_UINT8
    HDF's 8-bit unsigned integer ~= PDL's byte

DFNT_INT16
    HDF's 16-bit integer ~= PDL's short

DFNT_UINT16
    HDF's 16-bit unsigned integer ~= PDL's ushort

DFNT_INT32
    HDF's 32-bit integer ~= PDL's long

DFNT_INT64
    HDF's 32-bit integer ~= PDL's long

  Misc. HDF Library Constants:

MAX_NC_NAME
    This is the max name length for SDS variables, attribtues, and just about anything else.

MAX_VAR_DIMS
    This is the max number of dims a HDF variable can have.

VNAMELENMAX
    Max length of V interface names.

CURRENT AUTHOR & MAINTAINER
Judd Taylor, Orbital Systems, Ltd. judd dot t at orbitalsystems dot com

PREVIOUS AUTHORS
Patrick Leilde patrick.leilde@ifremer.fr contribs of Olivier Archer olivier.archer@ifremer.fr

SEE ALSO
perl(1), PDL(1), PDL::IO::HDF::SD(1), PDL::IO::HDF::VS(1), constant(1).