Help with arrays

[steevo]

I came across some C++ code that I wanted to use in my Python program, the conversion was fairly straightforward until the following:

void ComputeFeedForwardSignals(double* MAT_INOUT,double* V_IN,double* V_OUT, double* V_BIAS,int size1,int size2,int layer)
{
int row,col;
for(row=0;row < size2; row++)
{
V_OUT[row]=0.0;
for(col=0;col<size1;col++)V_OUT[row]+=(*(MAT_INOUT+(row*size1)+col)*V_IN[col]);
V_OUT[row]+=V_BIAS[row];
if(layer==0) V_OUT[row] = logistic(V_OUT[row]);
if(layer==1) V_OUT[row] = logistic(V_OUT[row]);
}
}

Mostly, it's just the line:
V_OUT[row]+=(*(MAT_INOUT+(row*size1)+col)*V_IN[col]);

What exactly is this line doing? MAT_INOUT is an array[20][16].
What is the '*' doing there all by itself at the begining?

Any help or even a link to any helpful info would be appreciated. I tried searching, but most likely using the wrong search terms.

Thanks

[GodPyro]

Those variables are pointers something native in C++ but not Python.

double* MAT_INOUT
double* V_IN
double* V_OUT
double* V_BIAS

*(MAT_INOUT+(row*size1)+col) is a pointer to a place in memory. I suggest reading:
http://www.cplusplus.com/doc/tutorial/pointers/

[steevo]

Ahhh! Thanks much, I think I understand now.

Years of experience googling for answers, this was actually the first time I've broken down and actually asked for help. Your reply was quick and informative! Thanks again.

[GodPyro]

You're welcome. Thats why we are here. :)