.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.16)
.\"
.\" Standard preamble:
.\" ========================================================================
.de Sp \" Vertical space (when we can't use .PP)
.if t .sp .5v
.if n .sp
..
.de Vb \" Begin verbatim text
.ft CW
.nf
.ne \\$1
..
.de Ve \" End verbatim text
.ft R
.fi
..
.\" Set up some character translations and predefined strings.  \*(-- will
.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
.\" double quote, and \*(R" will give a right double quote.  \*(C+ will
.\" give a nicer C++.  Capital omega is used to do unbreakable dashes and
.\" therefore won't be available.  \*(C` and \*(C' expand to `' in nroff,
.\" nothing in troff, for use with C<>.
.tr \(*W-
.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
.ie n \{\
.    ds -- \(*W-
.    ds PI pi
.    if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
.    if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\"  diablo 12 pitch
.    ds L" ""
.    ds R" ""
.    ds C` ""
.    ds C' ""
'br\}
.el\{\
.    ds -- \|\(em\|
.    ds PI \(*p
.    ds L" ``
.    ds R" ''
'br\}
.\"
.\" Escape single quotes in literal strings from groff's Unicode transform.
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\"
.\" If the F register is turned on, we'll generate index entries on stderr for
.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
.\" entries marked with X<> in POD.  Of course, you'll have to process the
.\" output yourself in some meaningful fashion.
.ie \nF \{\
.    de IX
.    tm Index:\\$1\t\\n%\t"\\$2"
..
.    nr % 0
.    rr F
.\}
.el \{\
.    de IX
..
.\}
.\"
.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
.\" Fear.  Run.  Save yourself.  No user-serviceable parts.
.    \" fudge factors for nroff and troff
.if n \{\
.    ds #H 0
.    ds #V .8m
.    ds #F .3m
.    ds #[ \f1
.    ds #] \fP
.\}
.if t \{\
.    ds #H ((1u-(\\\\n(.fu%2u))*.13m)
.    ds #V .6m
.    ds #F 0
.    ds #[ \&
.    ds #] \&
.\}
.    \" simple accents for nroff and troff
.if n \{\
.    ds ' \&
.    ds ` \&
.    ds ^ \&
.    ds , \&
.    ds ~ ~
.    ds /
.\}
.if t \{\
.    ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
.    ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
.    ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
.    ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
.    ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
.    ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
.\}
.    \" troff and (daisy-wheel) nroff accents
.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
.ds 8 \h'\*(#H'\(*b\h'-\*(#H'
.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
.ds ae a\h'-(\w'a'u*4/10)'e
.ds Ae A\h'-(\w'A'u*4/10)'E
.    \" corrections for vroff
.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
.    \" for low resolution devices (crt and lpr)
.if \n(.H>23 .if \n(.V>19 \
\{\
.    ds : e
.    ds 8 ss
.    ds o a
.    ds d- d\h'-1'\(ga
.    ds D- D\h'-1'\(hy
.    ds th \o'bp'
.    ds Th \o'LP'
.    ds ae ae
.    ds Ae AE
.\}
.rm #[ #] #H #V #F C
.\" ========================================================================
.\"
.IX Title "HDF5::Dataset 3pm"
.TH HDF5::Dataset 3pm "2011-01-22" "perl v5.14.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
PDL::IO::HDF5::Dataset \- PDL::IO::HDF5 Helper Object representing HDF5 datasets.
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is a helper-object used by \s-1PDL::IO::HDF5\s0 to interface with \s-1HDF5\s0 format's dataset objects.
Information on the \s-1HDF5\s0 Format can be found
at the \s-1NCSA\s0's web site at http://hdf.ncsa.uiuc.edu/ .
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
See \s-1PDL::IO::HDF5\s0
.SH "MEMBER DATA"
.IX Header "MEMBER DATA"
.IP "\s-1ID\s0" 1
.IX Item "ID"
\&\s-1ID\s0 number given to the dataset by the \s-1HDF5\s0 library
.IP "name" 1
.IX Item "name"
Name of the dataset.
.IP "parent" 1
.IX Item "parent"
Ref to parent object (group) that owns this dateset.
.IP "fileObj" 1
.IX Item "fileObj"
Ref to the \s-1PDL::IO::HDF5\s0 object that owns this object.
.SH "METHODS"
.IX Header "METHODS"
####\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
.SS "new"
.IX Subsection "new"
PDL::IO::HDF5::Dataset Constructor \- creates new object
.PP
\&\fBUsage:\fR
.PP
This object will usually be created using the calling format detailed in the \s-1SYNOPSIS\s0. The 
following syntax is used by the \s-1PDL::IO::HDF5\s0 object to build the object.
.PP
.Vb 6
\&   $a = new PDL::IO::HDF5:Dataset( name => $name, parent => $parent, 
\&                                fileObj => $fileObj);
\&        Args:
\&        $name                           Name of the dataset
\&        $parent                         Parent Object that owns this dataset
\&        $fileObj                        PDL::HDF object that owns this dateset.
.Ve
.SS "\s-1DESTROY\s0"
.IX Subsection "DESTROY"
PDL::IO::HDF5::Dataset Destructor \- Closes the dataset object
.PP
\&\fBUsage:\fR
.PP
.Vb 1
\&   No Usage. Automatically called
.Ve
.SS "set"
.IX Subsection "set"
Write data to the \s-1HDF5\s0 dataset
.PP
\&\fBUsage:\fR
.PP
.Vb 1
\& $dataset\->set($pdl);     # Write the array data in the dataset
.Ve
.SS "get"
.IX Subsection "get"
Get data from a \s-1HDF5\s0 dataset to a \s-1PDL\s0
.PP
\&\fBUsage:\fR
.PP
.Vb 2
\& $pdl = $dataset\->get;     # Read the Array from the HDF5 dataset, create a PDL from it
\&                           #  and put in $pdl
\&
\&                           # Assuming $dataset is three dimensional
\&                           # with dimensions (20,100,90)
.Ve
.PP
The \fIget\fR method can also be used to obtain particular slices or hyperslabs
of the dataset array. For example, if \f(CW$dataset\fR is three dimensional with dimensions
(20,100,90) then we could do:
.PP
.Vb 3
\& $start=pdl([0,0,0]);      # We begin the slice at the very beggining
\& $end=pdl([19,0,0]);       # We take the first vector of the array,
\& $stride=pdl([2,1,1]);     # taking only every two values of the vector 
\&
\& $pdl = $dataset\->get($start,$end,[$stride]); # Read a slice or
\&                           # hyperslab from the HDF5 dataset.
\&                           # $start, $end and optionally $stride
\&                           # should be PDL vectors with length the
\&                           # number of dimensions of the dataset.
\&                           # $start gives the starting coordinates
\&                           # in the array.
\&                           # $end gives the ending coordinate
\&                           # in the array
\&                           # $stride gives the steps taken from one
\&                           # coordinate to the next of the slice
.Ve
.PP
The mapping of \s-1HDF5\s0 datatypes in the file to \s-1PDL\s0 datatypes in memory will be according
to the following table.
.PP
.Vb 10
\& HDF5 File Type                         PDL Type
\& \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-               \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-
\& PDL::IO::HDF5::H5T_C_S1()      =>      PDL::Char Object    (Special Case for Char Strings)
\& PDL::IO::HDF5::H5T_STD_I8BE()  =>      $PDL::Types::PDL_B
\& PDL::IO::HDF5::H5T_STD_I8LE()  =>      $PDL::Types::PDL_B,
\& PDL::IO::HDF5::H5T_STD_U8BE()  =>      $PDL::Types::PDL_S,
\& PDL::IO::HDF5::H5T_STD_U8LE()  =>      $PDL::Types::PDL_S,
\& PDL::IO::HDF5::H5T_STD_I16BE() =>      $PDL::Types::PDL_S,
\& PDL::IO::HDF5::H5T_STD_I16LE() =>      $PDL::Types::PDL_S,
\& PDL::IO::HDF5::H5T_STD_U16BE() =>      $PDL::Types::PDL_L,
\& PDL::IO::HDF5::H5T_STD_U16LE() =>      $PDL::Types::PDL_L,
\& PDL::IO::HDF5::H5T_STD_I32BE() =>      $PDL::Types::PDL_L,
\& PDL::IO::HDF5::H5T_STD_I32LE() =>      $PDL::Types::PDL_L,
\& PDL::IO::HDF5::H5T_STD_U32LE() =>      $PDL::Types::PDL_LL,
\& PDL::IO::HDF5::H5T_STD_U32BE() =>      $PDL::Types::PDL_LL,
\& PDL::IO::HDF5::H5T_STD_I64LE() =>      $PDL::Types::PDL_LL,
\& PDL::IO::HDF5::H5T_STD_I64BE() =>      $PDL::Types::PDL_LL,
\& PDL::IO::HDF5::H5T_IEEE_F32BE()=>      $PDL::Types::PDL_F,
\& PDL::IO::HDF5::H5T_IEEE_F32LE()=>      $PDL::Types::PDL_F,
\& PDL::IO::HDF5::H5T_IEEE_F64BE()=>      $PDL::Types::PDL_D,
\& PDL::IO::HDF5::H5T_IEEE_F64LE()=>      $PDL::Types::PDL_D
.Ve
.PP
For \s-1HDF5\s0 File types not in this table, this method will attempt to
map it to the default \s-1PDL\s0 type \s-1PDL_D\s0.
.PP
\&\fBNote:\fR
.PP
Character arrays are returned as the special PDL::Char fixed-length string type. For fixed-length
\&\s-1HDF5\s0 string arrays, this is a direct mapping to the PDL::Char datatype. For \s-1HDF5\s0 variable-length string
arrays, the data is converted to a fixed-length character array, with a string size equal to the maximum
size of all the strings in the array.
.SS "dims"
.IX Subsection "dims"
Get the dims for a \s-1HDF5\s0 dataset. For example, a 3 x 4 array would return a perl array
(3,4);
.PP
\&\fBUsage:\fR
.PP
.Vb 1
\& @pdl = $dataset\->dims;    # Get an array of dims.
.Ve
.SS "attrSet"
.IX Subsection "attrSet"
Set the value of an attribute(s)
.PP
Attribute types supported are null-terminated strings and \s-1PDL\s0 matrices
.PP
\&\fBUsage:\fR
.PP
.Vb 7
\&   $dataset\->attrSet( \*(Aqattr1\*(Aq => \*(Aqattr1Value\*(Aq,
\&                    \*(Aqattr2\*(Aq => \*(Aqattr2 value\*(Aq, 
\&                    \*(Aqattr3\*(Aq => $pdl,
\&                    .
\&                    .
\&                    .
\&                   );
.Ve
.PP
Returns undef on failure, 1 on success.
.SS "attrDel"
.IX Subsection "attrDel"
Delete attribute(s)
.PP
\&\fBUsage:\fR
.PP
.Vb 6
\& $dataset\->attrDel( \*(Aqattr1\*(Aq, 
\&                    \*(Aqattr2\*(Aq,
\&                    .
\&                    .
\&                    .
\&                   );
.Ve
.PP
Returns undef on failure, 1 on success.
.SS "attrs"
.IX Subsection "attrs"
Get a list of all attribute names associated with a dataset
.PP
\&\fBUsage:\fR
.PP
.Vb 1
\&   @attrs = $dataset\->attrs;
.Ve
.SS "attrGet"
.IX Subsection "attrGet"
Get the value of an attribute(s)
.PP
Currently the attribute types supported are null-terminated strings
and PDLs.
.PP
\&\fBUsage:\fR
.PP
.Vb 1
\&   my @attrs = $dataset\->attrGet( \*(Aqattr1\*(Aq, \*(Aqattr2\*(Aq);
.Ve
.SS "IDget"
.IX Subsection "IDget"
Returns the \s-1HDF5\s0 library \s-1ID\s0 for this object
.PP
\&\fBUsage:\fR
.PP
.Vb 1
\& my $ID = $dataSetObj\->IDget;
.Ve
.SS "nameGet"
.IX Subsection "nameGet"
Returns the \s-1HDF5\s0 Dataset Name for this object.
.PP
\&\fBUsage:\fR
.PP
.Vb 1
\& my $name = $datasetObj\->nameGet;
.Ve