# HDF Reference Manual

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> ### DFSD - Single-file Scientific Data Interface

> | DFSDadddata/dsadata | Appends a scientific dataset in its entirety to an existing HDF file if the file exists. If not, a new file is created.
> | DFSDclear/dsclear | Clears all values set by DFSDset* routines.
> | DFSDendslab/dseslab | Terminates a sequence of slab calls started by DFSDstartslab by closing the file.
> | DFSDendslice/dseslc | Terminates the write operation after storing a slice of data in a scientific dataset.
> | DFSDgetcal/dsgcal | Retrieves the calibration record, if there is one, attached to a scientific dataset.
> | DFSDgetdata/dsgdata | Reads the next dataset in the file.
> | DFSDgetdatalen/dsgdaln | Retrieves the lengths of the label, unit, format, and coordinate system strings.
> | DFSDgetdatastrs/dsgdast | Retrieves information about the label, unit, and format attribute strings associated with the data.
> | DFSDgetdimlen/dsgdiln | Retrieves the length of the label, unit, and format attribute strings associated with the specified dimension.
> | DFSDgetdims/dsgdims | Retrieves the number of dimensions (rank) of the dataset and the sizes of the dimensions (dimsizes) for the next scientific dataset in the file.
> | DFSDgetdimscale/dsgdisc | Gets the scale corresponding to the specified dimension.
> | DFSDgetdimstrs/dsgdist | Retrieves the label, unit, and format attribute strings corresponding to the specified dimension.
> | DFSDgetfillvalue/dsgfill | Retrieves the fill value of a DFSD scientific dataset.
> | DFSDgetNT/dsgnt | Retrieves the data type of the next dataset to be read.
> | DFSDgetrange/dsgrang | Retrieves the maximum and minimum values stored with the scientific dataset.
> | DFSDgetslice/dsgslc | Reads part of a scientific dataset from a file.
> | DFSDlastref/dslref | Retrieves the most recent reference number used in writing or reading a scientific dataset.
> | DFSDndatasets/dsnum | Returns the number of scientific datasets in the file.
> | DFSDpre32sdg/dsp32sd | Tests if the scientific dataset with the specified reference number was created by an HDF library earlier than version 3.2.
> | DFSDputdata/dspdata | Writes a scientific data and related information to an HDF file.
> | DFSDputslice/dspslc | Writes part of a scientific dataset to a file.
> | DFSDreadref/dsrref | Specifies the reference number for the dataset to be read during the next read operation.
> | DFSDreadslab/dsrslab | Reads a slab of data from any scientific dataset.
> | DFSDrestart/dsfirst | Causes the next read command to be read from the first scientific dataset in the file, rather than the scientific dataset following the one that was most recently read.
> | DFSDsetcal/dsscal | Sets the calibration information associated with data
> | DFSDsetdatastrs/dssdast | Sets the label, unit, format, and coordinate system for the next dataset written to file.
> | DFSDsetdims/dssdims | Sets the rank and dimension sizes for all subsequent scientific datasets written to the file.
> | DFSDsetdimscale/dssdisc | Defines the scale for a dimension.
> | DFSDsetdimstrs/dssdist | Sets the label, unit, and format strings corresponding to the specified dimension.
> | DFSDsetfillvalue/dssfill | Set the value used to fill in any unwritten location in a scientific dataset.
> | DFSDsetlengths/dsslens | Sets the maximum lengths for the strings that will hold labels, units, formats, and the name of the coordinate system.
> | DFSDsetNT/dssnt | Sets the data type of the data to be written in the next write operation.
> | DFSDsetrange/dssrang | Stores the specified maximum and minimum data values.
> | DFSDstartslab/dssslab | Prepares the DFSD interface to write a slab of data to a scientific dataset.
> | DFSDstartslice/dssslc | Prepares the interface to write a data slice to the specified file.
> | DFSDwriteref/dswref | Specifies the reference number, ref, of the dataset to be overwritten next by DFSDputdata or DFSDadddata
> | DFSDwriteslab/dswslab | Writes a slab of data to a scientific dataset.

> ###

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