Home > eeg > egis > egis_file_utils > read_csdm.m

read_csdm

PURPOSE ^

function [csdm_data, csdm_fhdr, csdm_chdr] = read_csdm(csdm_fname, cell, obs)

SYNOPSIS ^

function [csdm_data, csdm_fhdr, csdm_chdr] = read_csdm(csdm_fname, cell, obs)

DESCRIPTION ^

 function [csdm_data, csdm_fhdr, csdm_chdr] = read_csdm(csdm_fname, cell, obs)

CROSS-REFERENCE INFORMATION ^

This function calls: This function is called by:

SOURCE CODE ^

0001 function [csdm_data, csdm_fhdr, csdm_chdr] = read_csdm(csdm_fname, cell, obs)
0002 
0003 % function [csdm_data, csdm_fhdr, csdm_chdr] = read_csdm(csdm_fname, cell, obs)
0004 
0005 size_data_type = 4;
0006 
0007 if nargin < 3
0008   error('Need 3 input arguments');
0009 end
0010 
0011 if length(cell) > 1
0012   error('Only one cell can be specified at a time');
0013 end
0014 
0015 if length(obs) > 1
0016   error('Only one observation can be specified at a time');
0017 end
0018 
0019 % Open the csdm file
0020 
0021 csdm_fid = fopen(csdm_fname, 'rb');
0022 
0023 % Read the csdm file header
0024 
0025 ave_hdr_offsets_v;
0026 
0027 [csdm_fhdr,csdm_chdr,ename,czeros,cgains,cnames,fcom,ftext, coff]=rd_csdm_hdr_v(csdm_fid);
0028 
0029 [cell_data_offsets]=get_csdm_cell_off(csdm_fhdr, csdm_chdr);
0030 
0031 % Seek to desired place in file
0032 
0033 foffset = cell_data_offsets(cell) + (obs-1)*csdm_fhdr(NChan)*csdm_chdr(cell,NPoints)*size_data_type;
0034 
0035 fseek(csdm_fid, foffset, 'bof');
0036 
0037 real_csdm_data = fread(csdm_fid, [csdm_fhdr(NChan) csdm_chdr(cell, NPoints)/2], 'float');
0038 
0039 imag_csdm_data = fread(csdm_fid, [csdm_fhdr(NChan) csdm_chdr(cell, NPoints)/2], 'float');
0040 
0041 csdm_data = real_csdm_data' + imag_csdm_data'*i;
0042 
0043 fclose(csdm_fid);

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