# PTB error when using DrawDots

**URL:** <https://psychtoolbox.discourse.group/t/ptb-error-when-using-drawdots/254>\
**Category:** Uncategorized\
**Created:** [June 12, 2014, 5:08pm UTC](https://psychtoolbox.discourse.group/t/ptb-error-when-using-drawdots/254 "2014-06-12T17:08:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [June 12, 2014, 5:08pm UTC](https://psychtoolbox.discourse.group/t/ptb-error-when-using-drawdots/254/1 "2014-06-12T17:08:19Z")

</div>

Hello everyone

When I apply the function DrawDots in my script, I receive following error messages:

PTB-ERROR: You requested a point size of 1.000000 units, which is not in the range (0.000000 to 0.000000) supported by your graphics hardware.

Error in function DrawDots: Usage error

Unsupported point size requested in Screen('DrawDots').

Does it mean that my graphic hardware is too old to use this function?

Or are there any way to fix this issue?

Thanks

Best regards,

Weishung

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**Author:** ![jeff00772002](https://avatars.discourse-cdn.com/v4/letter/j/90ced4/32.png) [@jeff00772002](https://psychtoolbox.discourse.group/u/jeff00772002)\
**Post date:** [June 13, 2014, 1:29am UTC](https://psychtoolbox.discourse.group/t/ptb-error-when-using-drawdots/254/2 "2014-06-13T01:29:34Z")

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Dear Mario

  

I just make a test by using following script, but it still doesn't work.

  

[wPtr,rect]=Screen('OpenWindow',0,[0 0 0]);

Screen('DrawDots',wPtr,[300 200]);

Screen(wPtr,'Flip');

WaitSecs(3);

Screen('closeAll');

  

My graphics is ATI Mobility Radeon HD 3470, and I am using Windows 7 as my operating system.

  

Thanks

Best regards,

  

Weishung

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**Author:** ![denispelli](https://avatars.discourse-cdn.com/v4/letter/d/cdc98d/32.png) [@denispelli](https://psychtoolbox.discourse.group/u/denispelli)\
**Post date:** [June 13, 2014, 4:42am UTC](https://psychtoolbox.discourse.group/t/ptb-error-when-using-drawdots/254/3 "2014-06-13T04:42:26Z")

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Denis Pelli

Professor of Psychology and Neural Science at New York University

[http://psych.nyu.edu/pelli/](http://psych.nyu.edu/pelli/)

[http://denispelli.com](http://denispelli.com)

[denis.pelli@...](mailto:denis.pelli@...)

  

  
  

> On Thu, Jun 12, 2014 at 9:29 PM, [jeff00772002@...](mailto:jeff00772002@...) [PSYCHTOOLBOX] \<[PSYCHTOOLBOX@yahoogroups.com](mailto:PSYCHTOOLBOX@yahoogroups.com)\> wrote:  
> 
> > Dear Mario
> > 
> >   
> > 
> > I just make a test by using following script, but it still doesn't work.
> > 
> >   
> > 
> > [wPtr,rect]=Screen('OpenWindow',0,[0 0 0]);
> > 
> > Screen('DrawDots',wPtr,[300 200]);
> > 
> > Screen(wPtr,'Flip');
> > 
> > WaitSecs(3);
> > 
> > Screen('closeAll');
> > 
> >   
> > 
> > My graphics is ATI Mobility Radeon HD 3470, and I am using Windows 7 as my operating system.
> > 
> >   
> > 
> > Thanks
> > 
> > Best regards,
> > 
> >   
> > 
> > Weishung