savejson.m

 json=savejson(rootname,obj,opt)

 convert a MATLAB object (cell, struct or array) into a JSON (JavaScript
 Object Notation) string

 authors:Qianqian Fang (fangq<at> nmr.mgh.harvard.edu)
            date: 2011/09/09

 input:
      rootname: name of the root-object, if set to '', will use variable name
      obj: a MATLAB object (array, cell, cell array, struct, struct array)
      opt: a struct for additional options, use [] if all use default
        opt can have the following fields (first in [.|.] is the default)
        opt.FloatFormat ['%.10g'|string]: format to show each numeric element
                         of a 1D/2D array;
        opt.ArrayIndent [1|0]: if 1, output explicit data array with
                         precedent indentation; if 0, no indentation
        opt.ArrayToStruct[0|1]: when set to 0, savejson outputs 1D/2D
                         array in JSON array format; if sets to 1, an
                         array will be shown as a struct with fields
                         "_ArrayType", "_ArraySize" and "_ArrayData"; for
                         sparse arrays, the non-zero elements will be
                         saved to _ArrayData field in triplet-format i.e.
                         (ix,iy,val) and "_ArrayIsSparse" will be added
                         with a value of 1.

 output:
      json: a string in the JSON format (see http://json.org)

 examples:
      a=struct('node',[1  9  10; 2 1 1.2], 'elem',[9 1;1 2;2 3],...
           'face',[9 01 2; 1 2 3; NaN,Inf,-Inf], 'author','FangQ');
      savejson('mesh',a)
      savejson('',a,struct('ArrayIndent',0,'FloatFormat','\t%.5g'))

 license:
     BSD or GPL version 3, see LICENSE_{BSD,GPLv3}.txt files for details

 -- this function is part of jsonlab toolbox (http://iso2mesh.sf.net/cgi-bin/index.cgi?jsonlab)