Hello, here is one approach. Write your equation (with new dummy variable D) as: Q L = D (1) D = e r1^2/(r1^2-e^2+r2^2) (2) So you have easy part (1) and the difficult part (2). Equation (2) can be written as a determinant |(-D+e) -D -D*e^2| | 0 1 r2^2| = 0 | 1 0 r1^2| Depending on ranges and luck, ...

No. You need to use

'manual_axis_data'

as shown in http://pynomo.org/wiki/index.php?title=Examples_of_axes_parameters

br,

\leif

Please find attached code that works. Note the line: 'align_func':lambda age:inv_boys(girls(age)), You need the inv_boys() function because the scaling are not linear. """ agescale.py Copyright (C) 2011 Jason Walker """ from pynomo.nomographer import * def boys(age): re...

I would try little modified code below for fig_4-3a_nomogram.py. Changed lambdas and order in block definition. Hope it works but I did not check. br, \leif # (G - 1) = (P - 1) exp(-lambda_tc) N_params_p2={ 'u_min':0.0, 'u_max':1.0, 'function':lambda P:P-1.0, #!!!!!! 'title':r'$P$', 'tick_levels':3,...

Hello Andrew,

you have missed parentheses in your equation. If your equation is type
f1(C/C0)=f2(T)*f3(pH)*f4(d)

I would probably make it simple type 3 equation with logs. If the equation is not of that form, let's look it more detailed once equation is corrected.

br,

\leif

Thanks Joe for the link!

I somehow can not find the pdf on the page. Should I register or is this (again) issue that users outside U.S. can not download content based on difference laws on copyright span?

\leif

I enjoyed the article! Reading of article: highly recommended.

Thanks Joe!

\leif

So this is actually an optimization problem: which algorithm to use to fit data for a given or guessed function. Least squares is of course only one choice. For me using python, I would hope to find a ready algorithm in: http://docs.scipy.org/doc/scipy/reference/optimize.html Minimizing maximum erro...

I have had not time to go into these articles, but I have a simple question: Would't any curve fitting algorithm work? If one has a function and data, curve fitting finds best match with given error function. For example least-squares fitting. Computer's in general use are quite new in perspective o...

Thanks to you Joe! Your comments were one driving force for the improvements and took the software to the right direction! Also comments and work by Ron have been a major driving force for the work.

Thanks!

\leif

Book Epstein: Nomography discusses in Chapter VIII Nonprojective transformations. It cites results of Gronwall that only equation of form: f1+f2+f3=0 can have nonprojective transformations (as is yours). There is for example circular form presented: |1/(f1^2+1) f1/(f1^2+1) 1| |1/(f2^2+1) f2/(f2^2+1)...

I manage to install numpy, scipy, pyx and pynomo to mac osx 10.6 (snow leopard). I have (at least) TeXLive as TeX on the system. On terminal I can generate nomographs using python with command "python script.py". But when using EasyEclipse for Python 1.3.1 everything works fine except PyX ...

PyNomo 0.2.2 released! New isopleth option and smart axes enhance the quality (in my opinion, a lot) of the generated nomographs. pynomo.org site will be updated soon to include the changes. Ron has updated his essay for this release. Thanks! see: http://myreckonings.com/wordpress/2009/07/31/creatin...

A brief list of updates is: -small bug fixes -colors -axis with arrow markings -R titles over pivot lines can be set manually, R titles have numbering R_1,R_2, etc. -Extra titles for axes -option to print grid for text placement -brute force manual line drawing (for isopleths) -pre_func to draw with...

PyNomo 0.2.1 is released. Pynomo.org site will be updated in few weeks.

\leif