compileIt for revolution?

[Dennis Brown]

Mark,

I did not write the external, I just bought it and used it.

Dennis

On Jun 22, 2005, at 7:04 PM, Mark Wieder wrote:

> Dennis-
>
> Wednesday, June 22, 2005, 1:47:25 PM, you wrote:
>
> DB> John,
>
> DB> I actually had a complete matrix algebra package as an external  
> for
> DB> Hypercard.  I know how to use it, because I cut my teeth on  
> APL.  I
> DB> implemented my complex algorithms and state machines in it.  The
> DB> coding was cumbersome, and it was difficult to debug and handle  
> edge
> DB> conditions, sparse arrays, etc.  And to top it all off, it only  
> ran
> DB> 25% faster than the simple HyperCard stack even though it could
> DB> crunch numbers 10 times faster.  However, I have to admit that it
> DB> spent a lot of time converting and passing arrays back and  
> forth to
> DB> HyperCard.  A native engine capability might make a big  
> difference if
> DB> the internal representation could be typed by making sure you only
> DB> put all the same type numbers into the array, and if the  
> indexes were
> DB> truly integers.  The both matrix and element by element operations
> DB> could be mixed and we would have the best of both worlds.
>
> Couldn't you just recompile this as a runrev external? The GetArray()
> and SetArray() functions can work with the entire array at once,
> saving you from having to pass individual array elements. If you
> really need the speed you could have the external process the array in
> assembly language, stuffing the values into registers and having the
> CPU crunch them for you.
>
> -- 
> -Mark Wieder
>  mwieder at ahsoftware.net
>
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