Format of MATLAB files exported from AcqKnowledge

data

Contains the data of the graph in floating point format, for all of the
channels of the array. The first dimension of this array is the amount
of data in each channel, the second dimension increments with each
channel. Therefore, each column contains a full channel of data that
can be accessed in MATLAB via data (1:length, [channel number]).

units

This string [character] array contains the textual representation of the units of
the samples stored in data, with one element per channel of data.
labels. This string [character] array contains the labels of each of the channels, with one
element per channel.

isi

This floating point array of one element gives the number of units of
a single inter sample interval of the data.

isi_units

This single string array provides a units string for a single unit of isi.
Time data will always be “ms,” frequency data will always be
“kHz,” and other values will be represented by an Arbitrary
horizontal axis type in an ACQ graph.

start_sample

Contains the time offset of the index 0 sample of data in isi units.
This will be 0 for many graphs, but if only a selected area of a graph
was exported into the MAT file, the start_sample will contain the
offset from the original data corresponding to the start of the data
array in the MAT file.