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PORobust reading of a tabulated data file with Matlab
 

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  1. PORobust reading of a tabulated data file with Matlab
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    <p>I'm trying to access the numerical data in a text file that is produced by a measurement device. The files are a mix of strings and numbers, and items are separated by tabs. It is not rectangular, which makes them not suitable for matlab's file loading functions, such as dlmread. I can convert the files to exel spreadsheets and load them with xlsread, but as I am dealing with hundreds of files, it is not an option for me.</p> <p>Here is what the files look like:</p> <pre><code>Heading String Commenttext X Axis Trace A Trace B Frequency Funct Ch1 Funct Ch2 Frequency / Hz Funct Ch1 / dBr Funct Ch2 / dBV Hz dBr dBV LOG LIN LIN 100 -60.35 -71.1446 10000 -7.48178 -12.0321 VOID VOID VOID VOID VOID VOID Scan #-5 Labeltext Labeltext Hz V V 1.000000000000e+003 3.999999910593e-002 1.000000000000e+000 A-X/37 A-Y A-LimLow A-LimUpp A-RefY in V B-X/37 B-Y B-LimLow B-LimUpp B-RefY in V 1.000000000000e+002 -4.873095199691e+001 VOID VOID 3.999999910593e-002 1.000000000000e+002 -2.026775796775e+001 VOID VOID 1.000000000000e+000 1.172102297533e+002 -4.492478734843e+001 VOID VOID 3.999999910593e-002 1.172102297533e+002 -2.024411835772e+001 VOID VOID 1.000000000000e+000 1.373823795883e+002 -3.994765661259e+001 VOID VOID 3.999999910593e-002 1.373823795883e+002 -2.022767912575e+001 VOID VOID 1.000000000000e+000 1.610262027561e+002 -3.628116388971e+001 VOID VOID 3.999999910593e-002 1.610262027561e+002 -2.021939551014e+001 VOID VOID 1.000000000000e+000 1.887391822135e+002 -3.285059881019e+001 VOID VOID 3.999999910593e-002 1.887391822135e+002 -2.021928320409e+001 VOID VOID 1.000000000000e+000 2.212216291070e+002 -2.987476652701e+001 VOID VOID 3.999999910593e-002 2.212216291070e+002 -2.022570411546e+001 VOID VOID 1.000000000000e+000 2.500000000000e+002 -2.751190343935e+001 VOID VOID 3.999999910593e-002 2.500000000000e+002 -2.023346726318e+001 VOID VOID 1.000000000000e+000 2.592943797405e+002 -2.728162367715e+001 VOID VOID 3.999999910593e-002 2.592943797405e+002 -2.023601503648e+001 VOID VOID 1.000000000000e+000 </code></pre> <p>etc.</p> <p>Note that: - The value in front of Scan #-5 tells me how many repetitions there are in the file - A-X/37 tells me how many lines per scan there are. - The 'VOID' elements are replaced by actual numbers when applicable, and vice versa.</p> <p>I would like to be able to extract the values that are present, and that my script is not dependent on the size of the traces, the number of repetitions or whether the values are numbers or 'VOID'.</p> <p>So far, based on the tips given in other treads, I was able to create an array with the rows of the file and extract the 2 first numbers of each row like this:</p> <pre><code>fid=fopen('data.txt'); Rows = textscan(fid,'%s', 'delimiter','\n'); %Creates a temporary array with the rows of the file fclose(fid); TraceStarts=strfind(Rows{1,1},'Scan'); %Looks for the start of each trace.. TracesIdx = find(~cellfun('isempty', TraceStarts)); %.. and stores the indexes. Traces= cellfun(@(x) textscan(x,'%f','delimiter','\t', 'CollectOutput',1), Rows{1,1}); </code></pre> <p>Traces is then a cell containing arrays for each row with at max the two first numbers per row. Why it stops searching for float items in a row after it found 2 is a mystery to me... I don't want to specify the sequence of numbers and strings in each row, because they might vary.</p> <p>Any help would be much appreciated.</p>
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