Questo articolo sarà sia in Italiano che in Inglese: scusate per gli strani colori ma aiuta a distinguere tra le due lingue.

Mi serviva per la tesi produrre delle superfici parametriche utilizzando Scilab, tutti gli esempi trovati nel manuale e su web non funzionavano e davano strani errori!!!! Così mi sono stufato e ho studiato un metodo alternativo per disegnarle…

Per disegnare una sfera parametrica (di prova) ho seguito il metodo suggerito dalle guide ricevendo l’errore che vedete:

This article will be either in Italian and in English: sorry for the weird colors but help to differentiate them.

I was in trying to plot a 3d parametric surface with Scilab, all the example I’ve found in the manual and on the web doesn’t worked for me giving some weird errors!!!! So i pissed off and worked around it finding my own way to draw a parametric surface…

To draw a parametric sphere (to test) I tried the way suggested by manuals getting the error you see:

u=linspace(0,%pi); // primo vettore dei parametri / first parameter vector

v=linspace(0,2*%pi); // secondo vettore dei parametri / second parameter vector

deff('[x,y,z]=fun(u,v)',['x=sin(u).*cos(v)','y=sin(u).*cos(v)','z=cos(u)']); // definizione dell’equazione parametrica / define the parametric equation


Z must not be a scalar or vector, not rendering surface.
!–error 999
set: color_mode property does not exist for this handle
at line 4 of function generic_i_h called by :
line 2 of function %s_i_h called by :
line 22 of function mesh called by :

Ho ricontrollato parecchie volte ma non ho fatto nulla di diverso da quello consigliato in numerose guide! Eppure non funziona così… Quindi ecco come ho risolto:

I checked a lot of times but exactly made what many guides advice to do! Nevertheless it doesn’t work this way… So here how i solved this issue:


Questo articolo è scritto sia in italiano che in inglese / this article has been written either in italian and in english: english reader will find it down under the italian article

my proposal

La mia proposta / My proposal (click sull’immagine per vederla a dimensioni naturali / click on the image to see it at original size)

Vorrei sapere da voi cosa ne pensate / I would like to know what do you think about it

I’ve translated the part that explain how to solve the problem with the Ati Mobility Radeon 9700 on my Asus A4K Notebook.

This laptop have a bug in the Bios that make busy all the MTRR registers…

here are the errors i got before fixing

$ dmesg

[fglrx] Maximum main memory to use for locked dma buffers: 1899 MBytes.
[fglrx] module loaded – fglrx 8.27.10 [Jul 27 2006] on minor 0
ACPI: PCI Interrupt Link [LNKE] enabled at IRQ 11
ACPI: PCI Interrupt 0000:01:00.0[A] -> Link [LNKE] -> GSI 11 (level, low) -> IRQ 11
mtrr: no more MTRRs available
[fglrx:firegl_addmap] *ERROR* mtrr allocation failed (-28)
[fglrx] Internal AGP support requested, but kernel AGP support active.
[fglrx] Have to use kernel AGP support to avoid conflicts.
[fglrx] AGP detected, AgpState = 0×1f00421b (hardware caps of chipset)
mtrr: no more MTRRs available
[fglrx:firegl_unlock] *ERROR* Process 4540 using kernel context 0


(II) fglrx(0): [drm] register handle = 0×00004000
(EE) fglrx(0): [agp] unable to acquire AGP, error “xf86_ENOSPC”
(EE) fglrx(0): cannot init AGP
(II) fglrx(0): [drm] removed 1 reserved context for kernel
(II) fglrx(0): [drm] unmapping 8192 bytes of SAREA 0×2000 at 0xb71af000
(WW) fglrx(0): ***********************************************
(WW) fglrx(0): * DRI initialization failed! *
(WW) fglrx(0): * (maybe driver kernel module missing or bad) *
(WW) fglrx(0): * 2D acceleraton available (MMIO) *
(WW) fglrx(0): * no 3D acceleration available *
(WW) fglrx(0): ********************************************* *

Here i explain how to fix this problem, it’s a translation of my italian article on my laptop.