On Tue, Nov 14, 2006 at 09:28:37AM +0100, [EMAIL PROTECTED] wrote:
> i'm making an apllication using gtk and I need to delete negative points of a
> serie.
How is exactly Gtk+ involved in this task?
> at first i read the first line an identify t,px,py...then i continue until the
> end of the file identifying t[i],px[i],py[i],i=1-NPOINTS
> so i build serie t,serie px,and serie py.
> during the reading...i would like that if any numeber is negative, delete it
> and
> not appear in the corresponding serie.
> So...at the end i want to obtain:
> (in this case)
>
> serie t 1,2,3
> serie px 20,4
> serie py 15,30,3
>
> how can i do it??
Are you *sure* you want the arrays to end up with different
lengths and mutually non-corresponding values?
Anyway, what you wrote above is then quite a good
description of the code: if you get a point you do not want
during the reading, just don't store it. That's all and
it's elementary C. To make Gtk+ involved in the whole issue
at least somehow, using GArrays:
gdouble *t, *px, *py;
GArray *ta, *pxa, *pya;
gdouble tp, pxp, pyp;
... open the file ...
ta = g_array_new(FALSE, FALSE, sizeof(gdouble));
pxa = g_array_new(FALSE, FALSE, sizeof(gdouble));
pya = g_array_new(FALSE, FALSE, sizeof(gdouble));
/* Use fscanf() only if the numbers use locale-defined
* decimal deparator, otherwise you have to use
* g_ascii_strotod() */
while (fscanf(filehandle, "%lf %lf %lf", &tp, &pxp, &pyp) == 3) {
if (tp >= 0.0)
g_array_append_val(ta, tp);
if (pxp >= 0.0)
g_array_append_val(pxa, pxp);
if (pyp >= 0.0)
g_array_append_val(pya, pyp);
}
/* Now you should also remember the lengths of the
* arrays because they differ. Or you can
* continue using the GArrays (don't free them then)
* instead of the plain C arrays.
*/
t = (gdouble*)ta->data;
px = (gdouble*)pxa->data;
py = (gdouble*)pya->data;
g_array_free(ta, FALSE);
g_array_free(pxa, FALSE);
g_array_free(pya, FALSE);
Yeti
--
Whatever.
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