Experimental Physics and
Industrial Control System

I have been working it on it a little bit more.  I was able to find the function that was written for getting a double array out of value in vtypes/Vtypehelper.java

 

    public static double[] toDoubles(final VType value) {

        final double[] array;

        if (value instanceof VNumberArray) {

            final ListNumber list = ((VNumberArray) value).getData();

            array = new double[list.size()];

            for (int i = 0; i < array.length; ++i) {

                array[i] = list.getDouble(i);

            }

        } else

            array = new double[0];

        return array;

    }

 

I have a List<List<Double>> for values now to hold each waveform array.

 

The issue I seem to be having is now with the jmatio part.

 

Each struct has a MLDouble Value which I pass it the dimensions (N,4000)  so it should be for one of my cases N rows (timestamps) by 4000 pts for each waveform.

 

        final MLDouble value = new MLDouble(null, dims_values);

 

However I cannot seem to figure out how to pass values(i) to value to set it in the struct

 

I thought MLDouble could just take an array from the API I read.  So each row index would get an array assigned to it but value.set is expecting a Double and does not accept the array.

 

value.set(values.get(i),i);

 

I also have tried just constructing the MLDouble with the matrix of values but also no luck.

 

        final MLDouble value = new MLDouble(null, dims_values);

 

 

Hi Kay,

 

I have been looking through the src and I am a little confused on how to actually get the exported array data out.  I see you have this iterator here to cycle through each value for each timestamp

 

                final VType value = iter.next();

 

then you turn that VType into a double using

 

                values.add(VTypeHelper.toDouble(value));

 

Does iter return the start of each array index if it’s an array of values or is it only returning the first index?

 

If Value is a VNumberArray is there a way to add it to the values list if I make it a List of Arrays instead of a List of Doubles?

 

Thanks