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dmanip - manipulate ERP data
dmanip commandfile outfile [options]
infile1 infile2 ...
dmanip is a program which can perform a number
of linear operations using ERPs as elements. It can perform most data massaging
one might want, including formation of grand averages, lumping ERPs across
experimental treatments, formation of difference waves, and re-referencing
data to another recording channel.
The processing performed by dmanip is
controlled by the commandfile, and the result of the operations on the
infile1 infile2 ... are placed in outfile at the conclusion of processing.
The options are:
Errors can occur during encoding of
the commandfile or during execution and processing of the data. In both
cases sufficient information is printed to help diagnose the problem. Data
overflow errors can often be eliminated by using a smaller desired_pp10uv.
Jonathan C. Hansen
Undoubtedly. Some drawbacks to dmanip are that
only one intermediate is used in the calculations, and they proceed without
the ability to force precedence from left to right. Hence, generality of
the arithmetic expressions is limited, and one may have to employ multiple
commandfiles and intermediate data files for very complex operations on
- -g #_bins
- This option must be used if no specific bin operations
are included in the commandfile (e.g. a grand average). #_bins is the number
of bins in the input files.
- -d desired_pp10uv
- One can alter the precision
of the data in the outfile by specifying the number of points which will
span 10 microvolts of data (desired_pp10uv). It is also possible to store
the data in inverted format by making desired_pp10uv negative. The proper
verpos value is maintained, however, so subsequent processing will maintain
the proper data polarity.
- -f erpfiles
- Ascii file containing the names of
ERP files to be manipulated by dmanip. This option saves the user from
having to input the name of each subject’s files when making super averages.
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