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## Copyright (C) 2013-2023 Alexander Barth
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} ncwrite (@var{filename}, @var{varname}, @var{x})
## @deftypefnx {Function File} {} ncwrite (@var{filename}, @var{varname}, @var{x}, @var{start}, @var{stride})
##
## Write array @var{x} to the the variable @var{varname} in the NetCDF file
## @var{filename}.
##
## The variable with the name @var{varname} and the appropriate dimension must
## already exist in the NetCDF file.
##
## If @var{start} and @var{stride} are present, a subset of the
## variable is written. The parameter @var{start} contains the starting indices
## (1-based) and @var{stride} the
## increment between two successive elements. These parameters are vectors whose
## length is equal to the number of dimension of the variable.
##
## If the variable has the _FillValue attribute, then the values equal to NaN
## are replaced by corresponding fill value NetCDF attributes scale_factor
## (default 1) and add_oddset (default 0) are use the transform the variable
## during writing:
##
## x_in_file = (x - add_offset)/scale_factor
##
## @subsubheading Example
## Create a netcdf file with a variable of 'mydata' and then write
## data to that variable.
## @example
## nccreate('myfile.nc','mydata');
## ncwrite('myfile.nc','mydata', 101);
## @end example
##
## @seealso{ncread,nccreate}
##
## @end deftypefn
function ncwrite (filename, varname, x, start, stride)
ncid = netcdf_open(filename,'NC_WRITE');
[gid,varid] = ncvarid(ncid,varname);
[varname_,xtype,dimids,natts] = netcdf_inqVar(gid,varid);
% number of dimenions
nd = length(dimids);
sz = zeros(1,nd);
count = zeros(1,nd);
for i=1:length(dimids)
[dimname, sz(i)] = netcdf_inqDim(gid,dimids(i));
count(i) = size(x,i);
endfor
if nargin < 4
start = ones(1,nd);
endif
if nargin < 5
stride = ones(1,nd);
endif
% apply attributes
factor = [];
offset = [];
fv = [];
for i = 0:natts-1
attname = netcdf_inqAttName(gid,varid,i);
if strcmp(attname,'scale_factor')
factor = netcdf_getAtt(gid,varid,'scale_factor');
elseif strcmp(attname,'add_offset')
offset = netcdf_getAtt(gid,varid,'add_offset');
elseif strcmp(attname,'_FillValue')
fv = netcdf_getAtt(gid,varid,'_FillValue');
endif
endfor
if ~isempty(offset)
x = x - offset;
endif
if ~isempty(factor)
x = x / factor;
endif
if ~isempty(fv)
x(isnan(x)) = fv;
endif
netcdf_putVar(gid,varid,start-1,count,stride,x);
netcdf_close(ncid);
endfunction
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