# HDF Reference Manual

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> ### SD - Multifile Scientific Data Interface

> | SDattrinfo/sfgainfo | Retrieves information about an attribute.
> | SDcheckempty/sfchempty | Determines whether a scientific dataset (an SDS) is empty.
> | SDcreate/sfcreate | Creates a new data set.
> | SDdiminfo/sfgdinfo | Retrieves information about a dimension.
> | SDend/sfend | Terminates access to an SD interface.
> | SDendaccess/sfendacc | Terminates access to a data set.
> | SDfileinfo/sffinfo | Retrieves the number of data sets and the number of global attributes in a file.
> | SDfindattr/sffattr | Finds the index of an attribute given its name.
> | SDgetcal/sfgcal | Retrieves the calibration information associated with a data set.
> | SDgetchunkinfo/sfgichnk | Retrieves chunking information for a data set.
> | SDgetcompinfo/sfgcompress | Retrieves data set compression type and compression information.
> | SDgetdatasize/ | Retrieves the sizes of original and compressed data.
> | SDgetdatastrs/sfgdtstr | Retrieves the predefined attributes of a data set.
> | SDgetdimid/sfdimid | Returns the identifier of a dimension given its index.
> | SDgetdimscale/sfgdscale | Retrieves the scale values for a dimension.
> | SDgetdimstrs/sfgdmstr | Retrieves the predefined attributes of a dimension.
> | SDgetfilename/sfgetfname | Given a file identifier, retrieves the name of the file.
> | SDgetfillvalue/sfgfill/sfgcfill | Reads the fill value of a data set, if the value has been set.
> | SDgetinfo/sfginfo | Retrieves the name, rank, dimension sizes, data type and number of attributes for a data set.
> | SDgetnamelen/sfgetnamelen | Retrieves the length of the name of a file, a dataset, or a dimension.
> | SDgetnumvars_byname/sfgnvars_byname | Get the number of data sets having the same name.
> | SDgetrange/sfgrange | Retrieves the maximum and minimum values of the range.
> | SDget_maxopenfiles/sfgmaxopenf | Retrieves current and maximum number of open files.
> | SDget_numopenfiles/sfgnumopenf | Returns the number of files currently being opened.
> | SDidtoref/sfid2ref | Returns the reference number assigned to a data set.
> | SDidtype/sfidtype | Given an id, return the type of object the id represents.
> | SDiscoordvar/sfiscvar | Determines if a data set is a coordinate variable.
> | SDisdimval_bwcomp/sfisdmvc | Determines whether a dimension has the old and new representations or the new representation only.
> | SDisrecord/sfisrcrd | Determines whether a data set is appendable.
> | SDnametoindex/sfn2index | Determines the index of a data set given its name.
> | SDnametoindices/sfn2indices | Retrieves indices of all variables with the same name.
> | SDreadattr/sfrnatt/sfrcatt | Reads the values of an attribute.
> | SDreadchunk/sfrchnk/sfrcchnk | Reads a data chunk from a chunked data set.
> | SDreaddata/sfrdata/sfrcdata | Reads a subsample of data from a data set or coordinate variable.
> | SDreftoindex/sfref2index | Returns the index of a data set given the reference number.
> | SDreset_maxopenfiles/sfrmaxopenf | Resets the maximum number of files can be opened at the same time.
> | SDselect/sfselect | Obtains the data set identifier (sds_id) of a data set.
> | SDsetattr/sfsnatt/sfscatt | Attaches an attribute to an object.
> | SDsetblocksize/sfsblsz | Sets the block size used for storing data sets with unlimited dimensions.
> | SDsetcal/sfscal | Sets the calibration information.
> | SDsetchunk/sfschnk | Sets the chunk size and the compression method, if any, of a data set.
> | SDsetchunkcache/sfscchnk | Sets the size of the chunk cache.
> | SDsetcompress/sfscompress | Compresses the data set with the specified compression method.
> | SDsetdatastrs/sfsdtstr | Sets the predefined attributes for a data set.
> | SDsetdimname/sfsdmname | Assigns a name to a dimension.
> | SDsetdimscale/sfsdscale | Stores the values of a dimension.
> | SDsetdimstrs/sfsdmstr | Sets the predefined attribute of a dimension.
> | SDsetdimval_comp/sfsdmvc | Determines whether a dimension will have the old and new representations or the new representation only.
> | SDsetexternalfile/sfsextf | Stores data in an external file.
> | SDsetfillmode/sfsflmd | Sets the current fill mode of a file.
> | SDsetfillvalue/sfsfill/sfscfill | Sets the fill value for a data set.
> | SDsetnbitdataset/sfsnbit | Specifies a non-standard bit length for the data set values.
> | SDsetrange/sfsrange | Sets the maximum and minimum range values for a data set.
> | SDstart/sfstart | Opens an HDF file and initializes an SD interface.
> | SDwritechunk/sfwchnk/sfwcchnk | Writes a data chunk to a chunked data set.
> | SDwritedata/sfwdata/sfwcdata | Writes a subsample of data to a data set or to a coordinate variable.

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