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