Search found 67 matches

by Glen
Thu Feb 11, 2010 4:09 am
Forum: Literature
Topic: Trouble finding an algorithm
Replies: 9
Views: 17159

Trouble finding an algorithm

I've been playing with the Diliberto-Straus algorithm, using the Chebyshev metric to fit a model of the form z = f(x) + g(y) It's a very simple algorithm (it took a few minutes to implement) and I've been looking at ways to improve it. Anyway von Golitschek (1984) extended the algorithm to the case ...
by Glen
Thu Feb 11, 2010 3:28 am
Forum: Mathematics
Topic: Any other ways to do z^2 = x^2 + y^2 ??
Replies: 4
Views: 11994

Re: Any other ways to do z^2 = x^2 + y^2 ??

Hi Glen, As another example that uses dividers or a compass (or marking a radius on a sheet of paper) rather than a straightedge, see the nomogram on the last page (marked page 101) of the 3 pages I scanned into this Word document: http://www.myreckonings.com/Temp/HypotenuseNomogram.doc I'm not sur...
by Glen
Mon Feb 08, 2010 3:11 am
Forum: Literature
Topic: 2010 Graphical Computing Calendar
Replies: 1
Views: 6672

Re: 2010 Graphical Computing Calendar

Thanks Ron, I subscribe to your blog via an RSS aggregator so I saw it when you posted it (it also got mentioned on several other blogs I read, so I couldn't miss it if I tried). I've already been through it with great interest, and showed it to my kids, and a mathematically inclined friend (a relie...
by Glen
Fri Feb 05, 2010 9:06 am
Forum: Software
Topic: Fitting nomograms to data
Replies: 1
Views: 8074

Fitting nomograms to data

Picking up again on a topic I looked at a few years ago, I've been playing about in my occasional spare evenings with using R to fit nomograms to data. Specifically, I've been generating (x,y,z) triples (initially from mathematical relationships, though sometimes I've added very small amounts of noi...
by Glen
Thu Jan 14, 2010 1:15 pm
Forum: Mathematics
Topic: Any other ways to do z^2 = x^2 + y^2 ??
Replies: 4
Views: 11994

Re: Any other ways to do z^2 = x^2 + y^2 ??

Thanks Leif. That's handy. [Edit: Now that I think about it' I've seen this before. In fact it was in a set of example nomograms that I think was probably the first page of nomograms I saw on-line. In fact, now that I've gone looking, I have a copy of it in one of my nomograms directories... how cou...
by Glen
Mon Jan 11, 2010 12:11 am
Forum: Mathematics
Topic: Any other ways to do z^2 = x^2 + y^2 ??
Replies: 4
Views: 11994

Any other ways to do z^2 = x^2 + y^2 ??

I know of two basic ways to do nomograms of the relation z^2 = x^2 + y^2 1) the ususal parallel-scale addition approach |-1 x^2 1 | | 1 y^2 1 | = 0 | 0 z^2/2 1 | 2) "parallel-resistor" scale approach ( http://en.wikipedia.org/wiki/Nomogram#Parallel-resistance.2Fthin-lens_nomogram ), with 1...
by Glen
Sun Jan 10, 2010 6:39 am
Forum: Software
Topic: Using R to create/draw nomograms
Replies: 3
Views: 13165

Re: Using R to create/draw nomograms

I haven't produced any nice examples yet, but I have put the example I was playing with and the presently kludgy code, here: http://mathbric.blogspot.com/2010/01/creating-nomograms-in-r.html My tick-mark angles aren't quite right - they don't come out quite at right angles to the curved scale. I bel...
by Glen
Sun Jan 10, 2010 12:58 am
Forum: Software
Topic: Using R to create/draw nomograms
Replies: 3
Views: 13165

Using R to create/draw nomograms

Having failed for what must be the fourth time to install MikTeX on my machine (the machine is having problems and the large/long install tends to make it overheat and crash), I temporarily put aside my attempts to get PyNomo going on my machine. Instead I decided to see what I could do in the free ...
by Glen
Mon Aug 03, 2009 4:59 am
Forum: PyNomo
Topic: PyNomo 0.2.1 released
Replies: 5
Views: 11135

Re: PyNomo 0.2.1 released

That was a great document, thanks Ron
by Glen
Thu Sep 11, 2008 1:17 pm
Forum: General
Topic: Orbitometer
Replies: 1
Views: 7827

Re: Orbitometer

Cool. Thanks Winchell. Without fully following what its doing, it actually looks like a combination of a slide rule and a sort of nomogram (but not an alignment nomogram).
by Glen
Fri Jul 25, 2008 4:46 am
Forum: General
Topic: Wargame nomogram site updated
Replies: 8
Views: 19216

Re: Wargame nomogram site updated

Hi Winchell! So glad you're here.

I haven't been active on this site a good few months now - I'm still very interested in nomography and I'm even working on something, I've just been busy with some other projects.
by Glen
Thu Mar 13, 2008 11:20 pm
Forum: Mathematics
Topic: 4 variable nomogram article
Replies: 5
Views: 15948

4 variable nomogram article

Ron and Liunian (both members here) have an article up on a 4-variable grid-type nomogram at Ron's blog. Check it out.

http://myreckonings.com/wordpress/2008/03/13/a-4-variable-nomogram-%e5%9b%9b%e5%8f%98%e9%87%8f%e8%af%ba%e6%a8%a1%e5%9b%be
by Glen
Tue Feb 26, 2008 5:28 am
Forum: General
Topic: circle-of-fifths guy?
Replies: 1
Views: 7543

circle-of-fifths guy?

I assumed that the guy with the circle-of-fifths website was legit. I see he's gone now. Was he a spammer?
by Glen
Tue Feb 26, 2008 5:09 am
Forum: Mathematics
Topic: Additive models and parallel nomograms
Replies: 0
Views: 9150

Additive models and parallel nomograms

I debated whether to post this to Literature (since I am describing a paper), or here (since I am describing how the mathematics in the paper relates to nomography), or to Software (since the algorithm has been implemented in the free package [i]R[/i]). I decided to post here and maybe have a supple...
by Glen
Tue Feb 26, 2008 4:59 am
Forum: General
Topic: board updated
Replies: 2
Views: 8798

Re: board updated

Thanks! At least now I know why I couldn't access the board earlier!

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