Easier to remember URL for pynomo playground is:

http://playground.pynomo.org

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\leif

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!

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\leif

Thanks!

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\leif

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.

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\leif

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...

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,...

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'

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\leif

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

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

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...

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...

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...

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 ...

Hello,

you are correct. I missed a sign in the expression

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.

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\leif

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, ...