% S = WFDB_isigopen(RECORD);
%
% Open input signal for a selected record.
%
% RECORD: Record name (string)
% S: Resulting Siginfo structure(s)
%
% Usage:
% S = WFDB_isigopen(RECORD)
% opens record named RECORD and returns the Siginfo structures in S. The
% number of open signals is found as length(S).  Fields in S(n) are the
% attributes of signal (n-1);  for example, S(0).gain is the gain of signal 0.
%
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