I'm searching for this code for the documentation, but I don't know what it means.

Get expert help.Thanks!

```
Names Default To Here( 1 );
/* Generate random values, Normal(0,1) */
Y = J( 150, 1, Random Normal() );
/* CDF function */
{Quant, CumProb} = CDF( Y ); Wait(0);
/* Draw empirical and theorical CDF */
New Window( "Empirical CDF",
Graph Box(
X Scale( -3, 3 ),
Y Scale( 0, 1 ),
Pen Color( "red" );
For( i = 2, i <= N Row( Quant ), i++,
H Line( Quant[i - 1], Quant[i], CumProb[i] );
V Line( Quant[i - 1], CumProb[i - 1], CumProb[i] );
);
i = N Row( Quant );
V Line( Quant[i], CumProb[i], 1 );
Pen Color( "blue" );
Y Function( Normal Distribution( q ), q );
)
);
```