ncrecget.m

MATLAB中读写、处理科学数据文件格式NETCDF的程序

function [data, status] = ncrecget(ncid, recnum, ...
                                      autoscale, recdim)

% ncrecget -- Emulator for broken mexcdf('recget', ...).
%  [data, status] = ncrecget(ncid, recnum, autoscale, recdim)
%   reads the record whose record number is recnum, from the
%   netcdf file whose id is ncid.  The resulting data are stored
%   in a single row-vector.  If autoscale is non-zero, then
%   the autoscale facility will be invoked.  If a recdim is
%   given, it substitutes for the actual recdim in the file,
%   if any.
 
% Copyright (C) 1996 Dr. Charles R. Denham, ZYDECO.
% All Rights Reserved.

if nargin < 1, help ncrecget; return, end
if nargin < 2, recnum = 0; end
if nargin < 3, autoscale = 0; end
if nargin < 4, recdim = -1; end

if recdim == -1
   [ndims, nvars, ngatts, recdim] = ncmex('inquire', ncid);
  else
   [ndims, nvars, ngatts] = ncmex('inquire', ncid);
end

if recdim >= ndims, error(' ## Invalid recdim.'), end

data = [];
status = 0;

[varids, varsizes, status] = ncmex('recinq', ncid);

if status == -1, return, end

for i = 1:length(varids)
   [varname, datatype, ndims, dimids, natts, status] = ...
      ncmex('varinq', ncid, varids(i));
   if status == -1, return, end
   dimsizes = zeros(1, ndims);
   for j = 1:ndims
      [dimname, dimsize, status] = ...
         ncmex('diminq', ncid, dimids(j));
      if dimsize == 0, dimsize = 1; end
      if status == -1, return, end
      dimsizes(j) = dimsize;
   end
   f = find(dimids == recdim);
   starts = dimsizes .* 0;
   starts(f) = recnum;
   counts = dimsizes;
   counts(f) = 1;
   [x, status] = ...
      ncmex('varget', ncid, varids(i), starts, counts, autoscale);
   if status == -1, return, end
   data = [data x(:).'];
end