Search found 55 matches

by Leif
Tue Apr 05, 2016 4:40 pm
Forum: PyNomo
Topic: pyNomo playground
Replies: 1
Views: 4048

Re: pyNomo playground

Easier to remember URL for pynomo playground is:

http://playground.pynomo.org

br,

\leif
by Leif
Sat Apr 02, 2016 7:31 pm
Forum: PyNomo
Topic: pyNomo playground
Replies: 1
Views: 4048

pyNomo playground

Hello all,

I have worked some time to make a web service "pyNomo playground" for running pynomo scripts. Now it is available as early beta in address:

http://46.101.125.20:8080

Check out and enjoy!

br,

\leif
by Leif
Sat Nov 01, 2014 1:21 pm
Forum: PyNomo
Topic: Trouble aligning scales
Replies: 4
Views: 6641

Re: Trouble aligning scales

Thanks!

br,

\leif
by Leif
Sun Jan 19, 2014 9:29 am
Forum: Mathematics
Topic: 6 variables equation
Replies: 5
Views: 6085

Re: 6 variables equation

One possibility to try is to fit your data to the nomographic matrix form. In my script there were 9X6=36 variables to tune (for example f1_0,f1_1,f1_2,f1_3,f1_4,f1_5, etc.). One could pick up some (clever) set from these variables and to try to fit data to tune them.

br,

\leif
by Leif
Sat Jan 18, 2014 3:33 pm
Forum: Mathematics
Topic: 6 variables equation
Replies: 5
Views: 6085

Re: 6 variables equation

Are you trying to make nomograph of some specific equation or just work a very general case? If you have a specific equation as polynomial approximation, it could be easier to use the original equation. If you could post the original equation here (or with email if you want to limit the audience)? b...
by Leif
Sat Jan 18, 2014 9:15 am
Forum: Mathematics
Topic: 6 variables equation
Replies: 5
Views: 6085

Re: 6 variables equation

Hello, I think this is tough question. Equation is possible to cast into nomographic form if it can be turned into determinant of matrix equals zero, where each row of matrix has functions of only one or two variables. In your case this could be three-grid nomograph and a determinant of matrix: [f1,...
by Leif
Thu May 10, 2012 6:56 pm
Forum: PyNomo
Topic: Duodecimal tickmarks?
Replies: 13
Views: 23399

Re: Duodecimal tickmarks?

Hello Jason,

For manual axis you can use parameters:
'text_distance_1' and 'grid_length_1'

to set text distance and tick marks length. Text size can be set with

'text_size_manual'

br,

\leif
by Leif
Sat Feb 18, 2012 11:59 am
Forum: General
Topic: The Posographe
Replies: 1
Views: 4748

Re: The Posographe

Thanks for the link! Quite a device. It would be interesting to find a work that discusses what mathematical functions can be implemented with mechanical devices...

\leif
by Leif
Sat Feb 18, 2012 11:56 am
Forum: Software
Topic: UseR talk, fitting a nomo equation in R (drawn in PyNomo)
Replies: 1
Views: 14000

Re: UseR talk, fitting a nomo equation in R (drawn in PyNomo

Thanks for the link! I had seen the slides but now also watched the talk that had very good discussion of cons and pros of nomographs.

\leif
by Leif
Sun Oct 09, 2011 7:08 pm
Forum: Mathematics
Topic: Nomogram for 5 variables
Replies: 12
Views: 18262

Re: Nomogram for 5 variables

Hello, little too many iterations with this case, but I think now it should work... Note exp() function in 'v_func':lambda x,v:(log((v*v/exp(x)-v))), An here the code... from pynomo.nomographer import * const_k=1 block_1_params={ 'block_type':'type_5', 'width':10.0, 'height':10.0, #'u_title_opposite...
by Leif
Sat Oct 08, 2011 9:14 pm
Forum: Mathematics
Topic: Nomogram for 5 variables
Replies: 12
Views: 18262

Re: Nomogram for 5 variables

Hello Markus, I think you over defined the nomograph isopleths. I think the key was to have an 'x' instead of 1 in: 'isopleth_values':[['x',0.1,1.0,'x']], Here is the nomograph code little tweaked. Some ranges need to be still adjusted. For example r1=20 is always out of range. from pynomo.nomograph...
by Leif
Thu Oct 06, 2011 8:54 pm
Forum: PyNomo
Topic: Duodecimal tickmarks?
Replies: 13
Views: 23399

Re: Duodecimal tickmarks?

Thanks Dave for your comments! PyNomo uses 5 levels of ticks in scales. Default settings for these are (taken from nomo_axis.py) 'text_distance_0':1.0, 'text_distance_1':1.0/4, 'text_distance_2':1.0/4, 'text_distance_3':1.0/4, 'text_distance_4':1.0/4, 'grid_length_0':3.0/4, 'grid_length_1':0.9/4, 'g...
by Leif
Tue Oct 04, 2011 6:26 pm
Forum: Mathematics
Topic: Nomogram for 5 variables
Replies: 12
Views: 18262

Re: Nomogram for 5 variables

Hello drafter, sometimes one can write an equation into determinant form with grid(s) but the grids collapse and are useless. == Proposal 1 == Alternative solution to your equation is to write it as Q*l/e = r1^2/(r1^2-r2^2) and in inverse form e/(Ql) = 1-r2^2/r1^2 and split with dummy variables A,B ...
by Leif
Sun Oct 02, 2011 6:09 pm
Forum: Mathematics
Topic: Nomogram for 5 variables
Replies: 12
Views: 18262

Re: Nomogram for 5 variables

Hello,

you are correct. I missed a sign in the expression :oops:

I have to say that at the moment I do not see how this equation can be presented as a nomograph. This does not mean it is not possible.

br,

\leif
by Leif
Sat Oct 01, 2011 7:00 pm
Forum: Mathematics
Topic: Nomogram for 5 variables
Replies: 12
Views: 18262

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, ...

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