How can i make an empty graph without using csv?

[Chrisir]

@Vadimkuzmin

How to change the left column with data from 150 in steps of 5 to 300.
How to change the data at the bottom from 1 to 99 in increments of 1. How to change the right column from 200-299?

Now we are talking.

Look at this

 for (int i = 0; i < nPoints; i++) {
    points.add(i, 30 + 10*noise(i*0.1));
  }  

Consider

 for (int i = 1; i < 99; i+=1) {
    points.add(i, i*5 );
  }