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readsac.m
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readsac.m
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function [t1, t2, d] = readsac(filenames)
%
% *** THIS CODE WAS NOT PRODUCED BY PLOURDE AND/OR NEDIMOVIC ***
% It was downloaded from:
% web.gps.caltech.edu/classes/ge162/Computer_Resources
% (last accessed November 2020)
%
%
%
% S = READSAC(FILENAMES); reads the given SAC data files. FILENAMES contains
% the names of SAC data files to be read. It may consist of a string for a
% single file or a cell array of strings for multiple file names. Wildcard '*'
% is accepted. If FILENAMES is omitted, all SAC data files in the current
% directory are read. The data sets and header variables of the SAC data
% files are returned in structure S.
%
% [INDEP, DEP] = READSAC(FILENAMES); reads the SAC data files and returns
% the independent and dependent variables in INDEP and DEP. INDEP and DEP are
% either cell arrays if more than one file is specified and data lengths are
% different for different files, or double vectors (matrices) if only one file is
% specified or if data have the same length for multiple input files.
% [INDEP, DEP1, DEP2] = READSAC(FILENAMES); reads spectral type of SAC data files and
% [INDEP1, INDEP2, DEP] = READSAC(FILENAMES); reads xyz (spectrogram) type
% of SAC data files.
%
% *** As of this version, SAC does not define general xyz type files. ***
%
% Structure S is defined to have following fields corresponding to SAC
% header variables and the data set except the first one. Fields that are
% set to undefined in the SAC data files are set to NaN or '', depending on
% the type of the variable, in the S structure.
%
% FILENAME - File name of SAC data file; Path to the file, if exists,
% is removed.
% DELTA - Data sampling interval
% DEPMIN - Minimum value of dependent variable
% DEPMAX - Maximum value of dependent variable
% SCALE - Multiplying factor for dependent variable
% ODELTA - Observed increment if different from nominal
% B - Beginning value of independent variable
% E - Ending value of independent variable
% O - Event origin time
% A - First arrival time
% INTERNAL1 - First internal variable
% T0 - First user-defined time picks or markers
% T1 - Second user-defined time picks or markers
% T2 - Third user-defined time picks or markers
% T3 - Fourth user-defined time picks or markers
% T4 - Fifth user-defined time picks or markers
% T5 - Sixth user-defined time picks or markers
% T6 - Seventh user-defined time picks or markers
% T7 - Eighth user-defined time picks or markers
% T8 - Ninth user-defined time picks or markers
% T9 - Tenth user-defined time picks or markers
% F - Final or end of event time
% RESP0 - First instrument response parameter
% RESP1 - Second instrument response parameter
% RESP2 - Third instrument response parameter
% RESP3 - Fourth instrument response parameter
% RESP4 - Fifth instrument response parameter
% RESP5 - Sixth instrument response parameter
% RESP6 - Seventh instrument response parameter
% RESP7 - Eighth instrument response parameter
% RESP8 - Ninth instrument response parameter
% RESP9 - Tenth instrument response parameter
% STLA - Station latitude
% STLO - Station longitude
% STEL - Station elevation
% STDP - Station depth
% EVLA - Event latitude
% EVLO - Event longitude
% EVEL - Event elevation
% EVDP - Event depth
% MAG - Event magnitude
% USER0 - First user-defined variable
% USER1 - Second user-defined variable
% USER2 - Third user-defined variable
% USER3 - Fourth user-defined variable
% USER4 - Fifth user-defined variable
% USER5 - Sixth user-defined variable
% USER6 - Seventh user-defined variable
% USER7 - Eighth user-defined variable
% USER8 - Ninth user-defined variable
% USER9 - Tenth user-defined variable
% DIST - Station-to-event distance (km)
% AZ - Event-to-station azimuth (degree)
% BAZ - Station-to-event azimuth (degree)
% GCARC - Station-to-event great-circle arc length (degree)
% INTERNAL2 - Second internal variable
% INTERNAL3 - Third internal variable
% DEPMEN - Mean value of dependent variable
% CMPAZ - Component azimuth
% CMPINC - Component incident angle
% XMINIMUM - Minimum value of X (spectral file only)
% XMAXIMUM - Maximum value of X (spectral file only)
% YMINIMUM - Minimum value of Y (spectral file only)
% YMAXIMUM - Maximum value of Y (spectral file only)
% UNUSED1 - First unused variable
% UNUSED2 - Second unused variable
% UNUSED3 - Third unused variable
% UNUSED4 - Fourth unused variable
% UNUSED5 - Fifth unused variable
% UNUSED6 - Sixth unused variable
% UNUSED7 - Seventh unused variable
% NZYEAR - GMT year corresponding to reference time
% NZJDAY - GMT julian day corresponding to reference time
% NZHOUR - GMT hour corresponding to reference time
% NZMIN - GMT minute corresponding to reference time
% NZSEC - GMT second corresponding to reference time
% NZMSEC - GMT milisecond corresponding to reference time
% NVHDR - Header version
% NORID - Origin ID
% NEVID - Event ID
% NPTS - Number of data points
% INTERNAL4 - Fourth internal variable
% NWFID - Waveform ID
% NXSIZE - Spectral length (spectral file only)
% NYSIZE - Spectral width (spectral file only)
% UNUSED8 - Eighth unused variable
% IFTYPE - Type of file
% IDEP - Type of dependent variable
% IZTYPE - Reference-time equivalence
% UNUSED9 - Ninth unused variable
% IINST - Type of recording instrument
% ISTREG - Station geographic region
% IEVREG - Event geographic region
% IEVTYP - Type of event
% IQUAL - Quality of data
% ISYNTH - Synthetic data flag
% IMAGTYP - Magnitude type
% IMAGSRC - Magnitude source
% UNUSED10 - Tenth unused variable
% UNUSED11 - Eleventh unused variable
% UNUSED12 - Twelveth unused variable
% UNUSED13 - Thirteenth unused variable
% UNUSED14 - Fourteenth unused variable
% UNUSED15 - Fifteenth unused variable
% UNUSED16 - Sixteenth unused variable
% UNUSED17 - Seventeenth unused variable
% LEVEN - True if data is evenly spaced
% LPSPOL - True if station polarity follows left-hand rule
% LOVROK - True if it is ok to overwrite this file on disk
% LCALDA - True if DIST, AZ, BAZ and GCARC are to be calculated from
% station and event coordinates
% UNUSED18 - Eighteenth unused variable
% KSTNM - Station name
% KEVNM - Event name
% KHOLE - Hole ID for nuclear test
% KO - Event origin time ID
% KA - First arrival time ID
% KT0 - First user-defined time pick ID
% KT1 - Second user-defined time pick ID
% KT2 - Third user-defined time pick ID
% KT3 - Fourth user-defined time pick ID
% KT4 - Fifth user-defined time pick ID
% KT5 - Sixth user-defined time pick ID
% KT6 - Seventh user-defined time pick ID
% KT7 - Eighth user-defined time pick ID
% KT8 - Ninth user-defined time pick ID
% KT9 - Tenth user-defined time pick ID
% KF - Final or end event time ID
% KUSER0 - First user-defined text string
% KUSER1 - Second user-defined text string
% KUSER2 - Third user-defined text string
% KCMPNM - Component name
% KNETWK - Network name
% KDATRD - Date data were read onto computer
% KINST - Generic name of recording instrument
% DATA1 - First data block
%
% If the SAC data file is for spectral or unevenly-spaced xy data, following
% fields may exist.
%
% DATA2 - Second data block
%
% Values of enumerated I-type header variables are converted from integers to
% corresponding alphanumeric names (all upper case).
% *************************************************************************
% This program was developed originally from the program readsac.m of the
% package MatSeis 1.6 by Sandia National Laboratories.
%
% Mark Harris, [email protected]
% Copyright (c) 1996-2001 Sandia National Laboratories. All rights reserved.
% *************************************************************************
%
% Copyright, 19, The Board of Governors of the Los Alamos National Security, LLC.
% This software was produced under a U. S. Government contract (DE-AC52-06NA25396)
% by Los Alamos National Laboratory, which is operated by the Los Alamos
% National Security, LLC for the U. S. Department of Energy. The U. S. Government
% is licensed to use, reproduce, and distribute this software. Permission is granted
% to the public to copy and use this software without charge, provided that
% this Notice and any statement of authorship are reproduced on all copies.
% Neither the Government nor the LANS makes any warranty, express or implied,
% or assumes any liability or responsibility for the use of this software.
%
% Xiaoning Yang, [email protected] 2002, 2008
%
% process input argument
if nargin < 1
filenames = dir;
filenames = filenames(~[filenames.isdir]);
filenames = {filenames.name};
else
% check input argument
error(nargchk(1, 1, nargin), 'string')
if ~iscell(filenames) && (~ischar(filenames) || size(filenames, 1) ~= 1)
error('Input must be a string or a cell array of strings !!!')
elseif ischar(filenames)
filenames = cellstr(filenames);
end
% treat wildcard
filename_temp = {''};
for i = 1:length(filenames)
if ismember('*', filenames{i})
[pathstr, name] = fileparts(filenames{i}); % separate path from name
filenamei = dir(deblank(filenames{i}));
if isempty(pathstr)
filename_temp = [filename_temp; {filenamei.name}'];
else % add path to filenames
filenamei = char({filenamei.name});
pathstr = [pathstr, filesep];
pathstr = repmat(pathstr, size(filenamei, 1), 1);
filenamei = [pathstr filenamei];
filename_temp = [filename_temp; cellstr(filenamei)];
end
else
filename_temp = [filename_temp, filenames(i)];
end
end
filenames = filename_temp(2:end);
end
nfiles = length(filenames);
% initialize output structure
s = sacstruct(nfiles);
% used to flag successfully read SAC files
count = false(nfiles, 1);
% read all files
for f = 1:nfiles
% open SAC file
fid = fopen(filenames{f}, 'r');
if fid ~= -1
% read SAC file header
[A count1] = fread(fid, [70 1], 'float32');
[B count2] = fread(fid, [40 1], 'int32');
if ~ismember(B(7), 1:6) % non-native byte order
[comp, mxsize, endian] = computer;
if strcmp(endian, 'B')
fclose(fid);
fid = fopen(filenames{f}, 'r', 'l');
else
fclose(fid);
fid = fopen(filenames{f}, 'r', 'b');
end
[A count1] = fread(fid, [70 1], 'float32');
[B count2] = fread(fid, [40 1], 'int32');
end
[C count3] = fread(fid, [1 192], 'char');
C = char(C);
%keyboard
% process valid SAC data file
if count1 == 70 && count2 == 40 && count3 == 192 && ...
B(10) >= 1 && (B(16) == 1 || B(16) == 2 || B(16) == 3 || ...
B(16) == 4 || B(16) == 51) && (B(36) == 0 || B(36) == 1)
% set undefined values
A(A == -12345.0) = NaN;
B(B == -12345) = NaN;
C = cellstr(reshape(C, 8, 24)');
C(strncmp('-12345', C, 6)) = {' '};
% fill output structure
[temp, name, ext] = fileparts(filenames{f});
s(f).FILENAME = [name, ext];
s(f).DELTA = A(1);
s(f).DEPMIN = A(2);
s(f).DEPMAX = A(3);
s(f).SCALE = A(4);
s(f).ODELTA = A(5);
s(f).B = A(6);
s(f).E = A(7);
s(f).O = A(8);
s(f).A = A(9);
s(f).INTERNAL1 = A(10);
s(f).T0 = A(11);
s(f).T1 = A(12);
s(f).T2 = A(13);
s(f).T3 = A(14);
s(f).T4 = A(15);
s(f).T5 = A(16);
s(f).T6 = A(17);
s(f).T7 = A(18);
s(f).T8 = A(19);
s(f).T9 = A(20);
s(f).F = A(21);
s(f).RESP0 = A(22);
s(f).RESP1 = A(23);
s(f).RESP2 = A(24);
s(f).RESP3 = A(25);
s(f).RESP4 = A(26);
s(f).RESP5 = A(27);
s(f).RESP6 = A(28);
s(f).RESP7 = A(29);
s(f).RESP8 = A(30);
s(f).RESP9 = A(31);
s(f).STLA = A(32);
s(f).STLO = A(33);
s(f).STEL = A(34);
s(f).STDP = A(35);
s(f).EVLA = A(36);
s(f).EVLO = A(37);
s(f).EVEL = A(38);
s(f).EVDP = A(39);
s(f).MAG = A(40);
s(f).USER0 = A(41);
s(f).USER1 = A(42);
s(f).USER2 = A(43);
s(f).USER3 = A(44);
s(f).USER4 = A(45);
s(f).USER5 = A(46);
s(f).USER6 = A(47);
s(f).USER7 = A(48);
s(f).USER8 = A(49);
s(f).USER9 = A(50);
s(f).DIST = A(51);
s(f).AZ = A(52);
s(f).BAZ = A(53);
s(f).GCARC = A(54);
s(f).INTERNAL2 = A(55);
s(f).INTERNAL3 = A(56);
s(f).DEPMEN = A(57);
s(f).CMPAZ = A(58);
s(f).CMPINC = A(59);
s(f).XMINIMUM = A(60);
s(f).XMAXIMUM = A(61);
s(f).YMINIMUM = A(62);
s(f).YMAXIMUM = A(63);
s(f).UNUSED1 = A(64);
s(f).UNUSED2 = A(65);
s(f).UNUSED3 = A(66);
s(f).UNUSED4 = A(67);
s(f).UNUSED5 = A(68);
s(f).UNUSED6 = A(69);
s(f).UNUSED7 = A(70);
s(f).NZYEAR = B(1);
s(f).NZJDAY = B(2);
s(f).NZHOUR = B(3);
s(f).NZMIN = B(4);
s(f).NZSEC = B(5);
s(f).NZMSEC = B(6);
s(f).NVHDR = B(7);
s(f).NORID = B(8);
s(f).NEVID = B(9);
s(f).NPTS = B(10);
s(f).INTERNAL4 = B(11);
s(f).NWFID = B(12);
s(f).NXSIZE = B(13);
s(f).NYSIZE = B(14);
s(f).UNUSED8 = B(15);
switch B(16)
case 1, filetype = 'ITIME';
case 2, filetype = 'IRLIM';
case 3, filetype = 'IAMPH';
case 4, filetype = 'IXY';
case 51, filetype = 'IXYZ';
end
s(f).IFTYPE = filetype;
switch B(17)
case 5, sigtype = 'IUNKN';
case 6, sigtype = 'IDISP';
case 7, sigtype = 'IVEL';
case 8, sigtype = 'IACC';
case 50, sigtype = 'IVOLTS';
otherwise, sigtype = '';
end
s(f).IDEP = sigtype;
switch B(18)
case 5, refequiv = 'IUNKN';
case 9, refequiv = 'IB';
case 10, refequiv = 'IDAY';
case 11, refequiv = 'IO';
case 12, refequiv = 'IA';
case 13, refequiv = 'IT0';
case 14, refequiv = 'IT1';
case 15, refequiv = 'IT2';
case 16, refequiv = 'IT3';
case 17, refequiv = 'IT4';
case 18, refequiv = 'IT5';
case 19, refequiv = 'IT6';
case 20, refequiv = 'IT7';
case 21, refequiv = 'IT8';
case 22, refequiv = 'IT9';
otherwise, refequiv = '';
end
s(f).IZTYPE = refequiv;
s(f).UNUSED9 = B(19);
s(f).IINST = B(20);
s(f).ISTREG = B(21);
s(f).IEVREG = B(22);
switch B(23)
case 5, evtype = 'IUNKN';
case 37, evtype = 'INUCL';
case 38, evtype = 'IPREN';
case 39, evtype = 'IPOSTN';
case 40, evtype = 'IQUAKE';
case 41, evtype = 'IPREQ';
case 42, evtype = 'IPOSTQ';
case 43, evtype = 'ICHEM';
case 44, evtype = 'IOTHER';
case 70, evtype = 'IQB';
case 71, evtype = 'IQB1';
case 72, evtype = 'IQB2';
case 73, evtype = 'IQBX';
case 74, evtype = 'IQMT';
case 75, evtype = 'IEQ';
case 76, evtype = 'IEQ1';
case 77, evtype = 'IEQ2';
case 78, evtype = 'IME';
case 79, evtype = 'IEX';
case 80, evtype = 'INU';
case 81, evtype = 'INC';
case 82, evtype = 'IO_';
case 83, evtype = 'IL';
case 84, evtype = 'IR';
case 85, evtype = 'IT';
case 86, evtype = 'IU';
otherwise, evtype = '';
end
s(f).IEVTYP = evtype;
switch B(24)
case 44, quality = 'IOTHER';
case 45, quality = 'IGOOD';
case 46, quality = 'IGLCH';
case 47, quality = 'IDROP';
case 48, quality = 'ILOWSN';
otherwise, quality = '';
end
s(f).IQUAL = quality;
switch B(25)
case 49, synth = 'IRLDTA';
otherwise, synth = '';
end
s(f).ISYNTH = synth;
switch B(26)
case 52, magtype = 'IMB';
case 53, magtype = 'IMS';
case 54, magtype = 'IML';
case 55, magtype = 'IMW';
case 56, magtype = 'IMD';
case 57, magtype = 'IMX';
otherwise, magtype = '';
end
s(f).IMAGTYP = magtype;
switch B(27)
case 58, magsrc = 'INEIC';
case 59, magsrc = 'IPDE';
case 60, magsrc = 'IISC';
case 61, magsrc = 'IREB';
case 62, magsrc = 'IUSGS';
case 63, magsrc = 'IBRK';
case 64, magsrc = 'ICALTECH';
case 65, magsrc = 'ILLNL';
case 66, magsrc = 'IEVLOC';
case 67, magsrc = 'IJSOP';
case 68, magsrc = 'IUSER';
case 69, magsrc = 'IUNKNOWN';
otherwise, magsrc = '';
end
s(f).IMAGSRC = magsrc;
s(f).UNUSED10 = B(28);
s(f).UNUSED11 = B(29);
s(f).UNUSED12 = B(30);
s(f).UNUSED13 = B(31);
s(f).UNUSED14 = B(32);
s(f).UNUSED15 = B(33);
s(f).UNUSED16 = B(34);
s(f).UNUSED17 = B(35);
s(f).LEVEN = logical(B(36));
if ~isnan(B(37))
s(f).LPSPOL = logical(B(37));
else
s(f).LPSPOL = B(37);
end
if ~isnan(B(38))
s(f).LOVROK = logical(B(38));
else
s(f).LOVROK = B(38);
end
if ~isnan(B(39))
s(f).LCALDA = logical(B(39));
else
s(f).LCALDA = B(39);
end
if ~isnan(B(40))
s(f).UNUSED18 = logical(B(40));
else
s(f).UNUSED18 = B(40);
end
s(f).KSTNM = C{1};
s(f).KEVNM = [C{2:3}];
s(f).KHOLE = C{4};
s(f).KO = C{5};
s(f).KA = C{6};
s(f).KT0 = C{7};
s(f).KT1 = C{8};
s(f).KT2 = C{9};
s(f).KT3 = C{10};
s(f).KT4 = C{11};
s(f).KT5 = C{12};
s(f).KT6 = C{13};
s(f).KT7 = C{14};
s(f).KT8 = C{15};
s(f).KT9 = C{16};
s(f).KF = C{17};
s(f).KUSER0 = C{18};
s(f).KUSER1 = C{19};
s(f).KUSER2 = C{20};
s(f).KCMPNM = C{21};
s(f).KNETWK = C{22};
s(f).KDATRD = C{23};
s(f).KINST = C{24};
% read data blocks
clear count2
[D, count1] = fread(fid, [s(f).NPTS, 1], 'float32');
s(f).DATA1 = D;
if ~s(f).LEVEN || strcmp(s(f).IFTYPE, 'IAMPH') || ...
strcmp(s(f).IFTYPE, 'IRLIM')
[D, count2] = fread(fid, [s(f).NPTS, 1], 'float32');
s(f).DATA2 = D;
end
% flag successfully read SAC file
if count1 == s(f).NPTS
if exist('count2','var')
if count2 == s(f).NPTS
count(f) = true;
end
else
count(f) = true;
end
end
end
% close SAC file.
fclose(fid);
end
end
s = s(count);
% assign output
if nargout == 1
t1 = s;
elseif nargout == 2
[t1, t2] = getsacdata(s);
else
[t1, t2, d] = getsacdata(s);
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function s = sacstruct(n)
% S = SACSTRUCT(N); returns an [Nx1] SAC structure with all fields
% initiated to their undefined (default) values.. N defaults to 1.
%
% Xiaoning Yang 2008 (modified from subfunction init_sac of readsac.m
% in the MATSEIS package)
% check arguments.
if (nargin < 1)
n = 1;
end
% initialize output structure.
sacfields = {'FILENAME'; 'DELTA'; 'DEPMIN'; 'DEPMAX'; 'SCALE'; 'ODELTA'; ...
'B'; 'E'; 'O'; 'A'; 'INTERNAL1'; 'T0'; 'T1'; 'T2'; 'T3'; 'T4'; 'T5'; ...
'T6'; 'T7'; 'T8'; 'T9'; 'F'; 'RESP0'; 'RESP1'; 'RESP2'; 'RESP3'; ...
'RESP4'; 'RESP5'; 'RESP6'; 'RESP7'; 'RESP8'; 'RESP9'; 'STLA'; 'STLO'; ...
'STEL'; 'STDP'; 'EVLA'; 'EVLO'; 'EVEL'; 'EVDP'; 'MAG'; 'USER0'; ...
'USER1'; 'USER2'; 'USER3'; 'USER4'; 'USER5'; 'USER6'; 'USER7'; 'USER8'; ...
'USER9'; 'DIST'; 'AZ'; 'BAZ'; 'GCARC'; 'INTERNAL2'; 'INTERNAL3'; ...
'DEPMEN'; 'CMPAZ'; 'CMPINC'; 'XMINIMUM'; 'XMAXIMUM'; 'YMINIMUM'; ...
'YMAXIMUM'; 'UNUSED1'; 'UNUSED2'; 'UNUSED3'; 'UNUSED4'; 'UNUSED5'; ...
'UNUSED6'; 'UNUSED7'; 'NZYEAR'; 'NZJDAY'; 'NZHOUR'; 'NZMIN'; 'NZSEC'; ...
'NZMSEC'; 'NVHDR'; 'NORID'; 'NEVID'; 'NPTS'; 'INTERNAL4'; 'NWFID'; ...
'NXSIZE'; 'NYSIZE'; 'UNUSED8'; 'IFTYPE'; 'IDEP'; 'IZTYPE'; 'UNUSED9'; ...
'IINST'; 'ISTREG'; 'IEVREG'; 'IEVTYP'; 'IQUAL'; 'ISYNTH'; 'IMAGTYP'; ...
'IMAGSRC'; 'UNUSED10'; 'UNUSED11'; 'UNUSED12'; 'UNUSED13'; 'UNUSED14'; ...
'UNUSED15'; 'UNUSED16'; 'UNUSED17'; 'LEVEN'; 'LPSPOL'; 'LOVROK'; ...
'LCALDA'; 'UNUSED18'; 'KSTNM'; 'KEVNM'; 'KHOLE'; 'KO'; 'KA'; 'KT0'; ...
'KT1'; 'KT2'; 'KT3'; 'KT4'; 'KT5'; 'KT6'; 'KT7'; 'KT8'; 'KT9'; 'KF'; ...
'KUSER0'; 'KUSER1'; 'KUSER2'; 'KCMPNM'; 'KNETWK'; 'KDATRD'; ...
'KINST'; 'DATA1';};
cl = cell(size(sacfields,1),n);
cl(2:111, :) = {nan};
cl(112:end-1, :) = {' '};
s = cell2struct(cl, sacfields, 1);
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function [out1, out2, out3] = getsacdata(s)
% [INDEP, DEP] = GETSACDATA(S); extracts independent and dependent variables
% from SAC structure S and puts them in INDEP and DEP. INDEP and DEP can either
% be time and data or x and y. They are cell arrays if length(S) > 1 and
% the lengths of the variables for different S elements are different,
% or double vectors (matrices) if either length(S) == 1 or the lengths of
% the variables for different S elements are the same.
%
% [OUT1, OUT2, OUT3] = GETSACDATA(S); extracts either spectral data from spectral
% type of SAC files or xyz data from xyz (spectrogram) SAC files. In case
% of spectral files, OUT1 is frequency vector, OUT2 is either real part or
% amplitude, and OUT3 is either imaginary part or phase. It is assumed, as
% the SAC default, that the complete complex spectrum of a signal, which
% spans from zero to (NPTS-1)*df where df is frequence sampling rate, are
% present. OUT1 only contains frequency from zero to Fn, where Fn is the
% Nyquist frequency (usually NPTS/2*df.) For xyz data, OUT1 is x (time),
% OUT2 is y (frequency) and OUT3 is z (spectrogram).
%
% *** As of this version, SAC does not define general xyz type files. ***
%
% S is defined in m-file readsac.m and is usually the output from readsac.m.
% S must contain same type of data (time series, spectra, xy or xyz).
% check output arguments
if nargout < 2
error(' Number of output arguments must be larger than one !!!')
end
% allocate output arguments
l = length(s);
if l == 0
out1 = [];
out2 = [];
if nargout == 3
out3 = [];
end
return
end
out1 = cell(l,1);
out2 = cell(l,1);
if nargout == 3
out3 = cell(l,1);
end
% loop over s
ll = zeros(l, 1); % lengths of time series
for i = 1:l
ll(i) = length(s(i).DATA1);
if i == 1
file_type = s(i).IFTYPE;
% reference time for all traces
if strcmp(file_type, 'ITIME')
year0 = s(i).NZYEAR-1901;
days0 = year0*365+round(year0/4)+s(i).NZJDAY;
ref0 = days0*86400+s(i).NZHOUR*3600+s(i).NZMIN*60+s(i).NZSEC+s(i).NZMSEC/1000;
if isnan(ref0)
ref0 = 0;
end
end
end
% check file type
if ~strcmp(s(i).IFTYPE, file_type)
error(' File types in input structure must be same !!!')
end
if strcmp(file_type, 'IXYZ')
if nargout ~= 3
error(' Number of output arguments for XYZ file must be three !!!')
end
out1(i) = {linspace(s(i).XMINIMUM, s(i).XMAXIMUM, s(i).NXSIZE)};
out2(i) = {linspace(s(i).YMINIMUM, s(i).YMAXIMUM, s(i).NYSIZE)'};
out3(i) = {reshape(s(i).DATA1, s(i).NXSIZE, s(i).NYSIZE)'};
elseif strcmp(file_type, 'IXY') && ~s(i).LEVEN
if nargout ~= 2
error(' Number of output arguments for XY file must be two !!!')
end
out1(i) = {s(i).DATA2}; % see SAC Manual
out2(i) = {s(i).DATA1};
else % spectrum and evenly-spaced time series
if isnan(s(i).B)
B = 0;
else
B = s(i).B;
end
if strcmp(file_type, 'ITIME')
if isnan(s(i).O)
% reference time of this trace
year = s(i).NZYEAR-1901;
days = year*365+round(year/4)+s(i).NZJDAY;
ref = days*86400+s(i).NZHOUR*3600+s(i).NZMIN*60+s(i).NZSEC+ ...
s(i).NZMSEC/1000;
if isnan(ref)
ref = 0;
end
B = B+ref-ref0;
if isnan(B)
B = 0;
end
O = 0;
else
O = s(i).O;
end
out1(i) = {(0:s(i).NPTS-1)'*s(i).DELTA+B-O};
elseif strcmp(file_type, 'IXY')
out1(i) = {(0:s(i).NPTS-1)'*s(i).DELTA+B};
else % frequency vector for positive-frequency part of the spectrum
if B ~= 0
warning(' First frequency point is not zero Hz !!!')
end
npts = round(s(i).NPTS/2);
if s(i).NPTS/2 ~= npts
warning(' Spectrum has odd number of data points !!!')
end
out1(i) = {(0:npts)'*s(i).DELTA+B};
end
if (strcmp(file_type, 'ITIME') || strcmp(file_type, 'IXY')) && nargout ~= 2
error([' Number of output arguments for time-series data ', ...
'must be two !!!'])
elseif (strcmp(file_type, 'IAMPH') || strcmp(file_type, 'IRLIM')) && nargout ~= 3
error([' Number of output arguments for spectral data must be ', ...
'three !!!'])
else
out2(i) = {s(i).DATA1};
if strcmp(file_type, 'IAMPH') || strcmp(file_type, 'IRLIM')
out3(i) = {s(i).DATA2};
end
end
end
end
if l == 1
out1 = out1{:};
out2 = out2{:};
if nargout == 3
out3 = out3{:};
end
elseif ~any(diff(ll))
temp1 = zeros(ll(1), l);
temp2 = temp1;
if nargout == 3
temp3 = temp1;
end
if strcmp(file_type, 'IRLIM') || strcmp(file_type, 'IAMPH')
temp1 = zeros(round(ll(1)/2)+1, 1);
end
for i = 1:l
temp1(:, i) = out1{i};
temp2(:, i) = out2{i};
if nargout == 3
temp3(:, i) = out3{i};
end
end
out1 = temp1;
out2 = temp2;
if nargout == 3
out3 = temp3;
end
end