Ron and Liunian (both members here) have an article up on a 4variable gridtype nomogram at Ron's blog. Check it out.
http://myreckonings.com/wordpress/2008/03/13/a4variablenomogram%e5%9b%9b%e5%8f%98%e9%87%8f%e8%af%ba%e6%a8%a1%e5%9b%be
4 variable nomogram article
4 variable nomogram article
Last edited by Glen on Thu Feb 25, 2010 4:38 am, edited 1 time in total.

 Posts: 27
 Joined: Mon Feb 04, 2008 9:43 pm
 Location: USA
 Contact:
Re: 4 variable nomogram article
Thanks, Glen. Actually, the design is all Liunian's work, but he was generous enough to ask that my name be included because I helped check it out and format it. It's a really interesting derivation, I think.
This link may work better:
http://myreckonings.com/wordpress/2008/ ... %e5%9b%be/
Ron
This link may work better:
http://myreckonings.com/wordpress/2008/ ... %e5%9b%be/
Ron
Re: 4 variable nomogram article
Thank you Glen.
I will change a better graph for extended value.That graph will work well for all real number.Can I email for you?
I will change a better graph for extended value.That graph will work well for all real number.Can I email for you?
Re: 4 variable nomogram article
I looked Allcock's book about gridnomographs and there seems to be nothing special about grid nomograms compared with line nomograms made by constructional determinant. One has to make projective transformation from four original points to for destination points. Case f+g+h=0 may be an exception. Of course, constructing constructional determinant is not always trivial.
The topic of optimal transformation is interesting. I use one in PyNomo development code where one optimizes sum of squared lengths of lines (axes) with respect to bounding box area. I plan to take outer edges of grid and use them as lines in case of grid nomographs.
I think there is space for some "scientific" contribution, when thinking about optimum algorithms for nomograph construction. In PyNomo I still construct the code base and it takes time before entering this new fun stuff: using computing power to construct better nomographs.
If I understand correctly, this is the issue you talk about; What is the criteria to optimize, is there straight analytical transformation or cheat sheet, how to optimize.
I'm interested if you have, for example from Hall's book, a more sophisticated approach compared to my simple above.
Thanks for link, interesting discussion and best of all, real nomograph made in this millennium!
\leif
The topic of optimal transformation is interesting. I use one in PyNomo development code where one optimizes sum of squared lengths of lines (axes) with respect to bounding box area. I plan to take outer edges of grid and use them as lines in case of grid nomographs.
I think there is space for some "scientific" contribution, when thinking about optimum algorithms for nomograph construction. In PyNomo I still construct the code base and it takes time before entering this new fun stuff: using computing power to construct better nomographs.
If I understand correctly, this is the issue you talk about; What is the criteria to optimize, is there straight analytical transformation or cheat sheet, how to optimize.
I'm interested if you have, for example from Hall's book, a more sophisticated approach compared to my simple above.
Thanks for link, interesting discussion and best of all, real nomograph made in this millennium!
\leif
Re: 4 variable nomogram article
Hi Leif,
I don't think optimise is best method.I have tried to for up 4variable formula.It can not work well.Because optimise just calculate point one by one,and the point mey be everwhere,so I think optimise is not valid for 4,5,6variable nomography.If you can find out a method optimise all point at one time,and make its result for continue,this problem may be solved.Perhaps,symbol optimise or symbol calculate is a good way.Its likes translate formula to determinant.
I don't think optimise is best method.I have tried to for up 4variable formula.It can not work well.Because optimise just calculate point one by one,and the point mey be everwhere,so I think optimise is not valid for 4,5,6variable nomography.If you can find out a method optimise all point at one time,and make its result for continue,this problem may be solved.Perhaps,symbol optimise or symbol calculate is a good way.Its likes translate formula to determinant.

 Posts: 27
 Joined: Mon Feb 04, 2008 9:43 pm
 Location: USA
 Contact:
Re: 4 variable nomogram article
Hi All,
I haven't seen any kind of universal rule for optimizing a nomogram other than squaring up the nomogram to fill all the available space. Beyond that, I think it depends of the accuracies required of the individual scales as well as spacing between any scales in a grid. It would be an interesting problem to solve. Sometimes the optimum nomogram seems to be a completely different design.
I've spent some time as a learning exercise trying to manually optimize Liunian's 4variable nomogram by performing transformations of the type from Hall's book as well as central projection transformations. I've just now posted a summary of these efforts in a comment at the end of the blog essay on that nomogram:
http://myreckonings.com/wordpress/2008/ ... %e5%9b%be/
The comment also links to a PDf file of results that lists the modifications to the standard nomographic determinant that are needed to perform Hall's transformation as well as the central projection transformation.
Ron
I haven't seen any kind of universal rule for optimizing a nomogram other than squaring up the nomogram to fill all the available space. Beyond that, I think it depends of the accuracies required of the individual scales as well as spacing between any scales in a grid. It would be an interesting problem to solve. Sometimes the optimum nomogram seems to be a completely different design.
I've spent some time as a learning exercise trying to manually optimize Liunian's 4variable nomogram by performing transformations of the type from Hall's book as well as central projection transformations. I've just now posted a summary of these efforts in a comment at the end of the blog essay on that nomogram:
http://myreckonings.com/wordpress/2008/ ... %e5%9b%be/
The comment also links to a PDf file of results that lists the modifications to the standard nomographic determinant that are needed to perform Hall's transformation as well as the central projection transformation.
Ron
Who is online
Users browsing this forum: No registered users and 5 guests