visualpython-users

[Visualpython-users] Clarifying question regarding semi-log plots

[Gabor K. <Kal...@ms...>]

In my earlier (9/11/08) "submit" I asked:
    "How can one "fool" Vpython  to display y=f(log10(x))  as a semi-log plot?"

To clarify: 
    How can I change the "tick-marks" to a log scale?

see sample program below:

************************

from visual import *
from visual.graph import *


graph1=gdisplay(x=0,y=0, width=400,height=300,title="semilog",xtitle="f=10^x",
                ytitle="y",xmax=4,xmin=1,ymax=500,ymin=0,
                foreground=color.black,background=color.white)
plot1 = gvbars(delta=0.5, color=color.green)

x=[10,100,1000]
y=[400,200,100]

for i in range(0,3):
    plot1.plot(pos=(log10(x[i]),y[i]))

Re: [Visualpython-users] Clarifying question regarding semi-log plots

[Jose A. M. H <jam...@fd...>]

Is your name really Gabor Kalman ????

What a very filtered name !!!.

:-O


  ----- Original Message ----- 
  From: Gabor Kalman 
  To: Vis...@li... 
  Cc: Bru...@nc... 
  Sent: Friday, September 12, 2008 5:11 PM
  Subject: [Visualpython-users] Clarifying question regarding semi-log plots


  In my earlier (9/11/08) "submit" I asked:
      "How can one "fool" Vpython  to display y=f(log10(x))  as a semi-log plot?"

  To clarify: 
      How can I change the "tick-marks" to a log scale?

  see sample program below:

  ************************

  from visual import *
  from visual.graph import *


  graph1=gdisplay(x=0,y=0, width=400,height=300,title="semilog",xtitle="f=10^x",
                  ytitle="y",xmax=4,xmin=1,ymax=500,ymin=0,
                  foreground=color.black,background=color.white)
  plot1 = gvbars(delta=0.5, color=color.green)

  x=[10,100,1000]
  y=[400,200,100]

  for i in range(0,3):
      plot1.plot(pos=(log10(x[i]),y[i]))


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Re: [Visualpython-users] Clarifying question regarding semi-log plots

[Bruce S. <Bru...@nc...>]

I'm assuming that what concerns you is that you don't want the x axis 
labeled 0, 2, 4 but rather 1, 100, 1e4. visual.graph doesn't provide 
this capability. Your solution, to use and label the x axis in terms of 
the log10 of the quantity of interest, is the best you can do, and is 
indeed a semilog plot of the data.

However, notice that visual.graph is simply a Python program, so you 
could make a copy of it, modify it, and import it instead of 
visual.graph. The revised version might be of general interest.

Bruce Sherwood

Gabor Kalman wrote:
> In my earlier (9/11/08) "submit" I asked:
>     "How can one "fool" Vpython  to display y=f(log10(x))  as a semi-log 
> plot?"
>  
> To clarify:
>     How can I change the "tick-marks" to a log scale?
>  
> see sample program below:
>  
> ************************
>  
> from visual import *
> from visual.graph import *
>  
> 
> graph1=gdisplay(x=0,y=0, 
> width=400,height=300,title="semilog",xtitle="f=10^x",
>                 ytitle="y",xmax=4,xmin=1,ymax=500,ymin=0,
>                 foreground=color.black,background=color.white)
> plot1 = gvbars(delta=0.5, color=color.green)
>  
> x=[10,100,1000]
> y=[400,200,100]
>  
> for i in range(0,3):
>     plot1.plot(pos=(log10(x[i]),y[i]))