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Trimmers of the form (offset1:offset2), where OFFSET1 is INCLUSIVE and
OFFSET2 is EXCLUSIVE may be appended to a file name to indicate a subset
of data within the file. Note that X-Midas used the form (start:end).
This is a confusing construct with zero based accounting.

See User's Guide -> Files -> File Trimmers for more information and examples.

For example;

nM> noop datafile(3:10) outputfile

creates a file consisting of 7 elements starting at element 3 and including
element 9. The THIN command uses the same principal of inclusive and exclusive
offsets. See explain on THIN for more examples.

If the second arg starts with a "+", it is a relative distance to offset2,
or the length of the segment.

If an argument starts with a "-", it is the offset relative to the end of
the file. Thus file(-1:+1) refers to the last element of the file.

The trimmers can be registered in abscissa addressing by preceding the
value with a tilde. By default, they are indexed. For instance:

nM> fft datafile(0:~10) outputfile

will FFT the first 10 seconds of the file, where

nM> fft datafile(~1:~10) outputfile

will FFT 10 seconds of the file starting 1 second into the file, where

If the arg to the left of the : is blank, the beginning of file is used.
If the arg to the right of the : is blank, the end of file is used.

Trimmers must come before qualifiers. For example,

nM> noop datafile(0:nels){aux=cwd} outputfile

uses the AUX qualifier to indicate the file to be used is in the CWD
(current working directory) AUX.

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