[sdiy] Wave terrain synthesis (was Re: Generatingacyclicwaveforms?)

[Joel B]

I would be interested to see this math implemented in piece of C code  
so those of us who know how to use math in software development but  
don't have the background to understand that notation could try to  
figure out what you are describing in real terms - a mathematical  
description of a car engine won't necessarily look like an engine to a  
mechanic...

Sent from my iPhone

On Mar 24, 2010, at 3:46 PM, Ian Fritz <ijfritz at comcast.net> wrote:

>
>> > It's standard TeX notation for multiple subscripts and means "C  
>> with
>> > subscript 1,x" which in turn signifies the x coordinate of the  
>> vector
>> > "C with subscript 1". TeX and LaTeX notation for mathematics are
>> > always used in ascii-based communication.
>
> It doesn't matter a bit what publishing program you are using.  You  
> did not define c with  a pair of subscripts.  It is absolutely  
> forbidden to do so in any serious mathematical work.  Besides,  
> wouldn't it  be more usual to write it as c_1,x.  You are  
> differentiating c_1, not one.
>
>
>> You should know at least a
>> > minimum about mathematical notation in technical papers, having
>> > published those umpteens of scientific papers that you so like to
>> > mention. If you did not understand mathematical notation, which  
>> mind
>> > you DOES change from university to university, it's enough to ask,
>> > instead of assuming the other end of the conversation is an idiot.
>
> I can assure you I have forgotten more algebraic geometry than you  
> will ever learn.
>
>> That does tends to happen when one begins to sense that a topic has  
>> devolved
>> into just another excuse for someone to show off how brilliant they  
>> are.
>
>
> OK, let's go over how simple this really is.
>
> He is saying  that if you are on a path through some terrain and you  
> speed up (staying on the path) you will get to the end quicker, so  
> the corresponding wave frequency increases, but if instead you  
> deviate a bit from the path (this is all irrelevant differential  
> changes) then it will take you about the same time but you will be  
> going over a different part of the terrain, so the corresponding  
> wave shape will change.
>
> Ten paragraphs, indeed.
>
>  Ian
>
>
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