% SKEW = WFDB_wfdbgetskew(SIG_NUM);
%
% Get the skew (as recorded in the '.hea' file, but in frame intervals
% rather than in sample intervals) of the specified input signal, or 0 if
% SIG_NUM is not a valid input signal number. Since sample vectors returned by
% WFDB_getvec or WFDB_getframe are already corrected for skew,
% WFDB_wfdbgetskew is useful primarily for programs that need to rewrite
% existing '.hea' files, where it is necessary to preserve the previously
% recorded skews.
%
% SKEW: Skew.
% SIG_NUM: Signal number (note: the first signal is signal number 0, etc.)
%
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