NASACDF (.cdf)

• Import supports the NASA CDF 3.1 and earlier versions.

• Mathematica by default exports NASA CDF 2.7 files, and can also generate 64-bit enhanced NASA CDF 3.1 files.

IMPORT AND EXPORT

• Import imports a CDF file, returning the names of the datasets stored in the file.

• Export exports an array or a Graphics object to a CDF file.

• Import returns a list of strings representing the names of all datasets contained in the file.

• Export creates a CDF file, storing the arrays or Graphics objects as separate datasets.

• Import imports the specified element from a CDF file.

• Import imports a subelement.

• Import imports multiple elements.

• The import format can be specified with Import or Import.

• Export creates a NASA CDF file by treating expr as specifying element elem.

• Export treats each as specifying the corresponding .

• Export exports expr with the specified option elements taken to have the specified values.

• Export uses rules to specify the elements to be exported.

• See the reference pages for full general information on Import and Export.

• ImportString and ExportString support the NASA CDF format.

ELEMENTS

• General Import elements:

	"Elements"	list of elements and options available in this file
	"Rules"	full list of rules for each element and option
	"Options"	list of rules for options, properties, and settings

• Data representation elements:

	"Data"	all datasets imported as a list of arrays
	"Datasets"	names of all datasets

• Import by default uses the element for the CDF format.

• Specifying and selecting datasets:

	"Datasets",n	dataset
	"Datasets",dataset	named dataset

• The following values can be given for :

	"Date"	dates, given as DateList specifications
	"Integer8"	8-bit integers
	"Integer16"	16-bit integers
	"Integer32"	32-bit integers
	"UnsignedInteger8"	unsigned 8-bit integers
	"UnsignedInteger16"	unsigned 16-bit integers
	"UnsignedInteger32"	unsigned 32-bit integers
	"Real32"	IEEE single-precision numbers
	"Real64"	IEEE double-precision numbers
	"String"	strings of ASCII characters

• Meta-information elements:

	"Annotations"	meta-information for each dataset
	"DataEncoding"	specifies how each dataset is compressed
	"DataFormat"	type used to represent each dataset
	"Dimensions"	data dimensions of each dataset
	"Metadata"	general meta-information as a list of rules

• can take the following values:

	None	no data compression is used
	"AdaptiveHuffman"	adaptive Huffman encoding
	"GZIP"	GZIP compression
	"Huffman"	Huffman encoding
	"RLE"	run-length encoding

OPTIONS

• Export options:

	"Append"	False	whether to append to an existing file
	"LargeFileSupport"	False	whether to export a 64-bit NASA CDF file

• With the default setting False, the exported file uses a 32-bit data representation conforming to Version 2.7 of the CDF format.

• 64-bit enhanced CDF 3.1 files can be created with True.

SEE ALSO

• "FITS"  "HDF"  "HDF5"  "NetCDF"

MORE ABOUT

• Graphics Importing & Exporting

• Importing & Exporting

• Listing of All Formats

• New in 6.0: Data Handling & Data Sources

• New in 6.0: Import & Export Formats

• Numerical Data Formats

• Raster Image Formats

• Scientific & Medical Data Formats

EXAMPLES

CLOSE ALL

Basic Examples   (7)

Get the dataset names:

Show the import elements available in the example file:

Read all meta-information:

Import the and datasets:

Importing the dataset returns a date in the form given by DateList:

Read a data array from the example file and render it using MatrixPlot:

Rasterize the earlier graphics and export them as an array of color values to NASA CDF:

Export a list of integers to NASA CDF, explicitly specifying the dataset name:

This imports the generated NASA CDF file:

Get the dataset names: In[1]:= Out[1]=   Show the import elements available in the example file: In[1]:= Out[1]=   Read all meta-information: In[1]:= Out[1]=   Import the and datasets: In[1]:= Out[1]=   Importing the dataset returns a date in the form given by DateList: In[1]:= Out[1]=   Read a data array from the example file and render it using MatrixPlot: In[1]:= Out[1]= Rasterize the earlier graphics and export them as an array of color values to NASA CDF: In[2]:= Out[2]=   Export a list of integers to NASA CDF, explicitly specifying the dataset name: In[1]:= Out[1]= This imports the generated NASA CDF file: In[2]:= Out[2]=