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1 ## Copyright (C) 2013 Alexander Barth |
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2 ## |
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3 ## This program is free software; you can redistribute it and/or modify |
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4 ## it under the terms of the GNU General Public License as published by |
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5 ## the Free Software Foundation; either version 2 of the License, or |
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6 ## (at your option) any later version. |
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7 ## |
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8 ## This program is distributed in the hope that it will be useful, |
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9 ## but WITHOUT ANY WARRANTY; without even the implied warranty of |
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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11 ## GNU General Public License for more details. |
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12 ## |
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13 ## You should have received a copy of the GNU General Public License |
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14 ## along with this program; If not, see <http://www.gnu.org/licenses/>. |
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15 |
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16 ## -*- texinfo -*- |
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17 ## @deftypefn {Function File} {} ncwrite (@var{filename}, @var{varname}, @var{x}) |
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18 ## @deftypefnx {Function File} {} ncwrite (@var{filename}, @var{varname}, @var{x}, @var{start}, @var{stride}) |
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19 ## |
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20 ## Write array @var{x} to the the variable @var{varname} in the NetCDF file |
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21 ## @var{filename}. |
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22 ## |
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23 ## The variable with the name @var{varname} and the appropriate dimension must |
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24 ## already exist in the NetCDF file. |
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25 ## |
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26 ## If @var{start} and @var{stride} are present, a subset of the |
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27 ## variable is written. The parameter @var{start} contains the starting indices |
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28 ## (1-based) and @var{stride} the |
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29 ## increment between two successive elements. These parameters are vectors whose |
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30 ## length is equal to the number of dimension of the variable. |
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31 ## |
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32 ## If the variable has the _FillValue attribute, then the values equal to NaN |
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33 ## are replaced by corresponding fill value NetCDF attributes scale_factor |
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34 ## (default 1) and add_oddset (default 0) are use the transform the variable |
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35 ## during the writting: |
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36 ## |
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37 ## x_in_file = (x - add_offset)/scale_factor |
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38 ## |
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39 ## @seealso{ncread,nccreate} |
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40 ## |
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41 ## @end deftypefn |
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42 |
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43 function ncwrite(filename,varname,x,start,stride) |
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44 |
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45 ncid = netcdf_open(filename,'NC_WRITE'); |
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46 [gid,varid] = ncvarid(ncid,varname); |
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47 [varname_,xtype,dimids,natts] = netcdf_inqVar(gid,varid); |
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48 |
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49 % number of dimenions |
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50 nd = length(dimids); |
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51 |
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52 sz = zeros(1,nd); |
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53 count = zeros(1,nd); |
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54 |
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55 for i=1:length(dimids) |
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56 [dimname, sz(i)] = netcdf_inqDim(gid,dimids(i)); |
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57 count(i) = size(x,i); |
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58 end |
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59 |
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60 if nargin < 4 |
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61 start = ones(1,nd); |
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62 end |
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63 |
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64 if nargin < 5 |
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65 stride = ones(1,nd); |
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66 end |
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67 |
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68 |
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69 % apply attributes |
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70 |
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71 factor = []; |
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72 offset = []; |
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73 fv = []; |
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74 |
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75 for i = 0:natts-1 |
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76 attname = netcdf_inqAttName(gid,varid,i); |
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77 |
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78 if strcmp(attname,'scale_factor') |
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79 factor = netcdf_getAtt(gid,varid,'scale_factor'); |
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80 elseif strcmp(attname,'add_offset') |
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81 offset = netcdf_getAtt(gid,varid,'add_offset'); |
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82 elseif strcmp(attname,'_FillValue') |
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83 fv = netcdf_getAtt(gid,varid,'_FillValue'); |
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84 end |
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85 end |
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86 |
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87 if ~isempty(offset) |
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88 x = x - offset; |
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89 end |
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90 |
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91 if ~isempty(factor) |
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92 x = x / factor; |
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93 end |
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94 |
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95 if ~isempty(fv) |
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96 x(isnan(x)) = fv; |
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97 end |
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98 |
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99 netcdf_putVar(gid,varid,start-1,count,stride,x); |
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100 |
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101 netcdf_close(ncid); |
