Convert Nested System.Object Arrays

The conversion is not recursive for a System.Object array contained within a System.Object array. You must use the cell function to convert each System.Object array.

For an example, build the NetDocCell assembly using the directions in Build a .NET Application for MATLAB Examples. The source code is here.

 C# NetDocCell Source File

using System;
/*
 * C# Assembly used in MATLAB .NET documentation.
 * Method getNewData is used to demonstrate 
 * how MATLAB handles a System.Object 
 * that includes another System.Object.
 */
namespace NetDocCell
{
    public class MyGraph
    {
        public Object[] getNewData()
        /*
         * Create a System.Object array to use in MATLAB examples.
         * Returns containerArr System.Object array containing:
         *  fLabel System.String object
         *  plotData System.Object array containing:
         *      xLabel System.String object
         *      doubleArr System.Double array
        */
        {
            String fLabel = "Figure Showing New Graph Data";
            Double[] doubleArr = { 
								18, 32, 3.133, 44, -9.9, -13, 33.03 };
            String xLabel = "X-Axis Label";
            Object[] plotData = { xLabel, doubleArr };
            Object[] containerArr = { fLabel, plotData };
            return containerArr;
        }
    }
}

Load the assembly and create a cell array, mlData.

dllPath = fullfile('c:','work','NetDocCell.dll');
NET.addAssembly(dllPath);
obj = NetDocCell.MyGraph;
mlData = cell(obj.getNewData)

The cell array contains elements of type

mlData = 
    [1x1 System.String]    [1x1 System.Object[]]

To access the contents of the System.Object array, create another cell array mlPlotData.

mlPlotData = cell(mlData{2})

This cell array contains elements of type

mlPlotData = 
    [1x1 System.String]    [1x1 System.Double[]]

cell Function Syntax for System.Object[,] Arrays

Use this cell function syntax to convert System.DateTime and System.String data contained in a System.Object[,] array to cell arrays of MATLAB data,

A = cell(obj,'ConvertTypes',type)

where obj is a .NET System.Object[,] array, and type is one of the following:

A is a cell array, that is the same size as the obj array.