matlab.io.hdf4.sd

Low-level access to HDF4 multifile scientific datasets (SD)

Description

To use these MATLAB^® functions, you should be familiar with the HDF SD C API. In most cases, the syntax of the MATLAB function is similar to the syntax of the corresponding HDF library function. The functions are implemented as the namespace matlab.io.hdf4.sd. To use this namespace, prefix the function name with a namespace path, or use the import function to add the namespace to the current import list, prior to calling the function, for example,

import matlab.io.hdf4.*
sdID = sd.start("myfile.hdf","read");

Access

matlab.io.hdf4.sd.close	Terminate access to SD interface
matlab.io.hdf4.sd.endAccess	Terminate access to dataset
matlab.io.hdf4.sd.getFilename	Name of file
matlab.io.hdf4.sd.select	Identifier of dataset with specified index
matlab.io.hdf4.sd.setExternalFile	Store data in external file
matlab.io.hdf4.sd.start	Open HDF file and initialize SD interface

Read/Write

matlab.io.hdf4.sd.create	Create new dataset
matlab.io.hdf4.sd.readData	Read subsample of data
matlab.io.hdf4.sd.setFillMode	Set current fill mode of file
matlab.io.hdf4.sd.writeData	Write to dataset

Inquiry

matlab.io.hdf4.sd.fileInfo	Number of datasets and global attributes in file
matlab.io.hdf4.sd.getCompInfo	Information about dataset compression
matlab.io.hdf4.sd.getInfo	Information about dataset
matlab.io.hdf4.sd.idToRef	Reference number corresponding to dataset identifier
matlab.io.hdf4.sd.idType	Type of object
matlab.io.hdf4.sd.isCoordVar	Determine if dataset is a coordinate variable
matlab.io.hdf4.sd.isRecord	Determine if dataset is appendable
matlab.io.hdf4.sd.nameToIndex	Index value of named dataset
matlab.io.hdf4.sd.nameToIndices	List of datasets with same name
matlab.io.hdf4.sd.refToIndex	Index of dataset corresponding to reference number

Dimensions

matlab.io.hdf4.sd.dimInfo	Information about dimension
matlab.io.hdf4.sd.getDimID	Dimension identifier
matlab.io.hdf4.sd.getDimScale	Scale data for dimension
matlab.io.hdf4.sd.setDimName	Associate name with dimension
matlab.io.hdf4.sd.setDimScale	Set scale values for dimension

User-defined Attributes

matlab.io.hdf4.sd.attrInfo	Information about attribute
matlab.io.hdf4.sd.findAttr	Index of specified attribute
matlab.io.hdf4.sd.readAttr	Read attribute value
matlab.io.hdf4.sd.setAttr	Write attribute value

Predefined Attributes

matlab.io.hdf4.sd.getCal	Dataset calibration information
matlab.io.hdf4.sd.getDataStrs	Predefined attributes for dataset
matlab.io.hdf4.sd.getDimStrs	Predefined attributes for dimension
matlab.io.hdf4.sd.getFillValue	Fill value for dataset
matlab.io.hdf4.sd.getRange	Maximum and minimum range values
matlab.io.hdf4.sd.setCal	Set dataset calibration information
matlab.io.hdf4.sd.setDataStrs	Set predefined attributes for dataset
matlab.io.hdf4.sd.setDimStrs	Set label, unit, and format attributes
matlab.io.hdf4.sd.setFillValue	Set fill value for dataset
matlab.io.hdf4.sd.setRange	Set maximum and minimum range value for dataset

Chunking/Tiling Operations

matlab.io.hdf4.sd.getChunkInfo	Chunk size for dataset
matlab.io.hdf4.sd.readChunk	Read chunk from dataset
matlab.io.hdf4.sd.setChunk	Set chunk size and compression method of dataset
matlab.io.hdf4.sd.writeChunk	Write chunk to dataset

Compression

matlab.io.hdf4.sd.setCompress	Set compression method of dataset
matlab.io.hdf4.sd.setNBitDataSet	Specify nonstandard bit length for dataset values