[changeset] - bug and fix for surfnorm()

[Daniel J Sebald]

Ben Abbott wrote:
> 
> On Oct 18, 2008, at 6:19 PM, Ben Abbott wrote:
> 
>> I noticed that the lines below produced multiple surfaces
>>
>>     surfnorm (peaks (10))
>>     surf (peaks)
>>
>> The problem was with the "hold on" that was needed to add the normal- 
>> vectors to the surface ... and no "hold off" followed.
>>
>> The attached changeset fixes that.
>>
>> Ben
>>
>> <changeset-surfnorm.patch>
> 
> 
> Dan,
> 
> I've merged your changeset with mine.
> 
> There are three differences between yours and mine. First you did a  
> nicer job of using the handle properties. Second, your placement  before 
> the surf() command is more proper (imo). Third, I tried to  preserve the 
> hold state for "oldh" as well. The one instance I can  imagine where 
> that matters is when h==oldh and an error is encountered  during the 
> "unwind_protect".

Thanks.  The combination of a "hold on/off" and related attribute in each of the axes is confusing.  One seems a global property, the other not.

Dan