BSL PRO Software Guide - Biopac

186 Part DMatlab File(*.MAT)MATLAB ® format—Uses the “MAT-file” binary format to save numerical and textualinformation as Filename.mat.Windows and Mac create MATLAB Version 6 files, which are compatible with bothMATLAB Version 6 and MATLAB Version 7.Interoperability with earlier versions of MATLAB is not guaranteed.The following variables will be in the workspace when the file is opened in MatLab.data Contains the data of the graph in floating point format, for all of thechannels of the array. The first dimension of this array is the amount ofdata in each channel, the second dimension increments with eachchannel. Therefore, each row contains a full channel of data that can beaccessed in MATLAB via data (1:length).units This string array contains the textual representation of the units of thesamples stored in data, with one element per channel of data.labels This string array contains the labels of each of the channels, with oneelement per channel.isiThis floating point array of one element gives the number of units of asingle 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,” andother values will be represented by an Arbitrary horizontal axis type inan ACQ graph.start_sample Contains the time offset of the index 0 sample of data in isi units. Thiswill be 0 for many graphs, but if only a selected area of a graph wasexported into the MAT file, the start_sample will contain the offset fromthe original data corresponding to the start of the data array in the MATfile.Visit the online support center at www.biopac.com