how do I get a single value from a 3d matrix?

[Javier Santiago Gaston De Iriarte Cabrera]

Hi,

I don't find examples in the Documentation (probably looking wrongly), how do I extract I single value from a matrix?

this doesn't seem to work

static vector x_norm(SAMPLE_SIZE);  

   static matrix input_data[1][SAMPLE_SIZE][1];

   for(int i = 0; i < SAMPLE_SIZE; i++)
     {
       x_norm[i] = input_data[0][i][0];  // Asigna valores normalizados
     }