How can I convert a .NET array of instrument data into a row-and-column Matlab array?

I would appreciate some pointers on understanding how to extract instrument data from separate channels from scaledData in the following and put them into the typical row-and-column Matlab array:

scaledData = NET.createArray('System.Double', sectionLength*sectionCount*channelCount);

errorCode = waveformAiCtrl.GetData(sectionLength*sectionCount*channelCount,scaledData,-1); % where -1 means wait for buffer to fill up.

Thank you.

Answer 1

[Tejas]

Hello Charlie,

To extract data from an object created with 'NET.createArray', the 'Get' method can be utilized. For more information on methods associated with this object, refer to this documentation: https://www.mathworks.com/help/matlab/matlab_external/calling-net-methods.html .

Once the data is extracted, memory pre-allocation and array indexing can be used to efficiently store the data in a MATLAB array.

Here is an example for this approach:

• Generate sample data.

    dim1 = 10; 
    dim2 = 5;  
    dim3 = 3; 
    scaleData = NET.createArray('System.Double', [dim1, dim2, dim3]);
    for i = 0:(dim1-1)
        for j = 0:(dim2-1)
            for k = 0:(dim3-1)
                randomValue = rand() * 100;
                scaleData.Set(i, j, k, randomValue);
            end
        end
    end

• Pre-allocate memory for the MATLAB array where the data will be stored.

    matlabArray = zeros(dim1, dim2, dim3); 

• Use the 'Get' method to extract values from 'scaleData' and store them in a MATLAB array.

    for i = 0:(dim1-1)
        for j = 0:(dim2-1)
            for k = 0:(dim3-1)
                value = scaleData.Get(i, j, k);
                matlabArray(i+1, j+1, k+1) = value;
            end
        end
    end