EmguCV equivalent to Java mat.put(i, 0, mv) - emgucv

Question

I'm trying to convert a Java class to a C# one using EmguCV. It's for a class in Unsupervised Learning. The teacher made a program using OpenCV and Java. I have to convert it to C#.
The goal is to implement a simple Face Recognition algorithm.
The method I'm stuck at:
Mat sample = train.get(0).getData();
mean = Mat.zeros(/*6400*/sample.rows(), /*1*/sample.cols(), /*CvType.CV_64FC1*/sample.type());
// Calculating it by hand
train.forEach(person -> {
Mat data = person.getData();
for (int i = 0; i < mean.rows(); i++) {
double mv = mean.get(i, 0)[0]; // Gets the value of the cell in the first channel
double pv = data.get(i, 0)[0]; // Gets the value of the cell in the first channel
mv += pv;
mean.put(i, 0, mv); // *********** I'm stuck here ***********
}
});
So far, my C# equivalent is:
var sample = trainSet[0].Data;
mean = Mat.Zeros(sample.Rows, sample.Cols, sample.Depth, sample.NumberOfChannels);
foreach (var person in trainSet)
{
var data = person.Data;
for (int i = 0; i < mean.Rows; i++)
{
var meanValue = (double)mean.GetData().GetValue(i,0);
var personValue = (double)data.GetData().GetValue(i, 0);
meanValue += personValue;
}
}
And I am not finding the put equivalent in C#. But, if I'm being honest, I'm not even sure the previous two lines in my C# equivalent are correct.
Can someone help me figure this one out?

Answer 1

You can convert it like this:
Mat sample = trainSet[0].Data;
Mat mean = Mat.Zeros(sample.Rows, sample.Cols, sample.Depth, sample.NumberOfChannels);
foreach (var person in trainSet)
{
Mat data = person.Data;
for (int i = 0; i < mean.Rows; i++)
{
double meanValue = (double)mean.GetData().GetValue(i, 0);
double personValue = (double)data.GetData().GetValue(i, 0);
meanValue += personValue;
double[] mva = new double[] { meanValue };
Marshal.Copy(mva, 0, mean.DataPointer + i * mean.Cols * mean.ElementSize, 1);
}
}