Search found 56 matches

by Leif
Sat Oct 01, 2011 7:00 pm
Forum: Mathematics
Topic: Nomogram for 5 variables
Replies: 12
Views: 59553

Re: Nomogram for 5 variables

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, ...
by Leif
Thu Sep 22, 2011 8:39 pm
Forum: PyNomo
Topic: Duodecimal tickmarks?
Replies: 13
Views: 67561

Re: Duodecimal tickmarks?

No. You need to use

'manual_axis_data'

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

br,

\leif
by Leif
Thu Sep 22, 2011 8:35 pm
Forum: PyNomo
Topic: Trouble aligning scales
Replies: 4
Views: 27705

Re: Trouble aligning scales

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...
by Leif
Sun Aug 21, 2011 7:14 pm
Forum: PyNomo
Topic: Advice needed while (re)creating compound nomogram
Replies: 1
Views: 16917

Re: Advice needed while (re)creating compound nomogram

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,...
by Leif
Wed Jan 26, 2011 9:49 pm
Forum: PyNomo
Topic: Some ideas on representing an equation
Replies: 1
Views: 17036

Re: Some ideas on representing an equation

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
by Leif
Sat May 08, 2010 10:11 am
Forum: Literature
Topic: Best books on nomography ?
Replies: 12
Views: 84968

Re: Best books on nomography ?

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
by Leif
Wed Mar 03, 2010 7:48 pm
Forum: Literature
Topic: Recent publication on medical nomography
Replies: 1
Views: 19040

Re: Recent publication on medical nomography

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

Thanks Joe!

\leif
by Leif
Tue Feb 23, 2010 8:22 pm
Forum: Literature
Topic: Trouble finding an algorithm
Replies: 9
Views: 46480

Re: Trouble finding an algorithm

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...
by Leif
Fri Feb 19, 2010 7:14 am
Forum: Literature
Topic: Trouble finding an algorithm
Replies: 9
Views: 46480

Re: Trouble finding an algorithm

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...
by Leif
Thu Jan 28, 2010 8:00 pm
Forum: PyNomo
Topic: PyNomo 0.2.2 release
Replies: 3
Views: 24718

Re: PyNomo 0.2.2 release

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
by Leif
Thu Jan 14, 2010 4:59 am
Forum: Mathematics
Topic: Any other ways to do z^2 = x^2 + y^2 ??
Replies: 4
Views: 30204

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

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)...
by Leif
Sat Nov 21, 2009 2:51 pm
Forum: PyNomo
Topic: EasyEclipse, PyX in Mac OSX
Replies: 0
Views: 23514

EasyEclipse, PyX in Mac OSX

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 ...
by Leif
Wed Oct 21, 2009 6:54 am
Forum: PyNomo
Topic: PyNomo 0.2.2 release
Replies: 3
Views: 24718

PyNomo 0.2.2 release

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...
by Leif
Mon Jul 27, 2009 6:05 am
Forum: PyNomo
Topic: PyNomo 0.2.1 released
Replies: 5
Views: 32117

Re: PyNomo 0.2.1 released

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...
by Leif
Sun Jul 26, 2009 9:59 pm
Forum: PyNomo
Topic: PyNomo 0.2.1 released
Replies: 5
Views: 32117

PyNomo 0.2.1 released

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

\leif

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