openEMS/matlab/ReadUI.m

60 lines
1.4 KiB
Matlab

function UI = ReadUI(files, path, freq)
% function UI = ReadUI(files, path, freq)
%
% read current and voltages from multiple files found in path
%
% returns voltages/currents in time and frequency-domain
%
% remarks on the frequency-domain:
% - all signals are assumed to start at t=0
% - currents that e.g. start at t = +delta_t/2 will be phase shifted by
% exp(-j*w*t(1))
%
% parameter:
% freq (optional):
% frequency-domain values will be calculated according to 'freq'
% if 'freq' is not given, a FFT will be used
%
% e.g.
% U = ReadUI({'ut1_1','ut1_2'},'tmp' );
% I = ReadUI('it1' ,'tmp',[0.5e9 1e9 1.5e9]);
%
% openEMS matlab interface
% -----------------------
% author: Thorsten Liebig
if (nargin<2)
path ='';
end
if (ischar(files))
filenames{1}=files;
else
filenames=files;
end
UI.TD = {};
UI.FD = {};
for n=1:numel(filenames)
tmp = load( fullfile(path,filenames{n}) );
t = tmp(:,1)';
val = tmp(:,2)';
UI.TD{n}.t = t;
UI.TD{n}.val = val;
if (numel(tmp(1,:))>2)
UI.TD{n}.additional = tmp(:,3:end)';
end
if (nargin<3)
[UI.FD{n}.f,UI.FD{n}.val] = FFT_time2freq( t,val );
else
UI.FD{n}.f = freq;
UI.FD{n}.val = DFT_time2freq( t, val, freq );
end
%correct phase error for time-shifted signals
UI.FD{n}.val = UI.FD{n}.val .* exp(-1j*2*pi*UI.FD{n}.f * t(1));
end