the field corresponds to the name of an attribute...

The data in that field,
contained in a cell array, represents the entry values for that attribute.
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cdfinfo
For VariableAttributes, the attribute data resides in an N-by-2 cell array,
where N is the number of variables. The first column of this cell array contains
the variable names associated with the entries. The second column contains
the entry values.
Note Attribute names may not match the names of the attributes in the CDF
file exactly. Because attribute names can contain characters that are illegal in
MATLAB field names, they may be translated into legal field names. Illegal
characters that appear at the beginning of attributes are removed; other
illegal characters are replaced with underscores ('_'). If an attribute’s name is
modified, the attribute’s internal number is appended to the end of the field
name. For example, Variable%Attribute might become
Variable_Attribute_013.
The Variables Field
The Variables field of the returned info structure is an N-by-6 cell array,
where N is the number of variables. The six columns of the cell array contain
the following information.
Column No.
Description
Return Type
1
Name of the variable
String
2
Dimensions of the variable, as returned by
Double
the size function
array
3
Number of records assigned for the variable
Double
4
Data type of the variable, as stored in the
String
CDF file
5
Record and dimension variance settings for
String
the variable
6
Sparsity of the variable’s records
String
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cdfinfo
Column 5 - Record and Dimension Variance
This is a string indicating either true or false for one or more types of variance
in the variable’s values. The single T or F to the left of the slash designates
whether values vary by record. The zero or more T or F letters to the right of
the slash designate whether values vary at each dimension. Here are some
examples.
T/
for a scalar variable
F/T
for a one-dimensional variable
T/TFF
for a three-dimensional variable
Column 6 - Record Sparsity
This is a string holding one of three possible values:
• 'Full'
• 'Sparse (padded)'
• 'Sparse (nearest)'
Examples
info = cdfinfo('example.cdf')
info =
Filename: 'example.cdf'
FileModDate: '29-Jun-1995 05:51:58'
FileSize: 230513
Format: 'CDF'
FormatVersion: '2.4.8'
FileSettings: [1x1 struct]
Subfiles: {}
Variables: {7x6 cell}
GlobalAttributes: [1x1 struct]
VariableAttributes: [1x1 struct]
info.Variables
ans =
'L_gse'
[1x2 double]
[
1]
'char'
'F/T'
'Full'
'Status%C1'
[1x2 double]
[7493]
'uint8'
'T/T'
'Full'
'B_gse%C1'
[1x2 double]
[7493]
'single'
'T/T'
'Full'
'B_nsigma%C1'
[1x2 double]
[7493]
'single'
'T/'
'Full'
See Also
cdfread
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cdfread
2cdfread
Purpose
Read data from a CDF file
Syntax
data = cdfread(file)
data = cdfread(file, 'records', recnum, ...)
data = cdfread(file, 'variables', varnames, ...)
data = cdfread(file, 'slices', dimensionvalues, ...)
[data, inf0] = cdfread(file, ...)
Description
data = cdfread(file) reads all of the variables from each record of the
Common Data Format (CDF) file specified in the string, file. The function
returns a cell array, in which each row contains a record and each column
represents a variable.
data = cdfread(file, 'records', recnums, ...) reads only those records
specified in the vector, recnums. The record numbers are zero-based. The
function returns a cell array having length(recnums) number of rows and as
many columns as there are variables.
data = cdfread(file, 'variables', varnames, ...) reads only those
variables specified in the 1-by-N or N-by-1 cell array of strings, varnames. Data
is returned in a cell array having length(varnames) number of columns and a
row for each record requested.
data = cdfread(file, 'slices', dimensionvalues, ...) reads specific
values from the records of one variable in the CDF file. The N-by-3 matrix,
dimensionvalues, indicates which records are to be read by specifying start,
interval, and count parameters for each of the N dimensions of the variable.
The start parameter is zero-based.