s_gd.m

matlab源代码

function description=s_gd(seismic,mnem)
% Function gets description of header with mnmeonic "mnem" from seismic data set "seismic"
% If the global variable S4M.case_sensitive is set to false, the case of the header mnemonic
% is disregarded
% Written by: E. R., December 30, 2000
% Last updated: December 30, 2000; compact header representation
%
%             description=s_gd(seismic,mnem)
% INPUT
% seismic     seismic data set
% mnem        header mnemonic
% OUTPUT
% description string with description of header with mnemonic "mnem"

global S4M

if strcmpi(mnem,'trace_no')       % Implied header "trace_no"
  description='Trace number';
  return
end

mnems=seismic.header_info(:,1);

if S4M.case_sensitive
   idx=find(ismember(mnems,mnem));
else 
   idx=find(ismember(lower(mnems),lower(mnem)));
end

if ~isempty(idx) & length(idx) == 1
   description=seismic.header_info{idx,3};
   return
end

% Handle error condition
if isempty(idx)
  disp([' Header "',mnem,'" not found. Available headers are:'])
  disp(mnems')
else
  disp([' More than one header found: ',cell2str(mnems(idx),', ')])
end

error(' Abnormal termination')