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Contents → Writing User Functions → Compiling user functions → Getting and setting data points

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In order to transfer information about a data point between your code and the overhead modules with type 4 user functions, these built-in routines are available

Name   What it Does   pt_get(p, i)   Fetches data point i into Point whose address is p   pt_set(p, i)   Sets data point i from Point whose address is p

The following code fragment sets the x and y values for 100 points. The error-bar value and line-control state only need to be set once since the same storage for the Point is reused each time.

{
        Point   pt;             /* Declare storage */

        set_s(&pt, 0);          /* Error bar = 0 */
        set_down_pen(&pt);      /* Set pen down */
        for (i=0; i<100; i++) {
                set_x(&pt, i);      /* x = i */
                set_y(&pt, i*i);    /* y = i * i */
                pt_set(&pt, i);     /* Set values */
        }
        set_npts(i);            /* Set number of points */
        new_points();           /* New ranges */
}

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