matplotlib-users

[Matplotlib-users] Scattered symbols data

[Clear <c.m...@gm...>]

Hello,

I would like to know if it is possible to display the following feature
using matplotlib. Say that you have a 2D plot(x,y) with a lot of data. You
plot the data using a 2D solid line. Would be possible to add "some"
circles/squared or whatever to the solid line? When I say "some" I mean only
scattered values, otherwise given the quantity of data you would appreciate
the symbols.

Thanks,

Clear
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Re: [Matplotlib-users] Scattered symbols data

[João L. S. <js...@fc...>]

On 07/15/2010 02:36 PM, Clear wrote:
>
> Hello,
>
> I would like to know if it is possible to display the following feature
> using matplotlib. Say that you have a 2D plot(x,y) with a lot of data. You
> plot the data using a 2D solid line. Would be possible to add "some"
> circles/squared or whatever to the solid line? When I say "some" I mean only
> scattered values, otherwise given the quantity of data you would appreciate
> the symbols.
>
> Thanks,
>
> Clear

You can specify the parameter markevery=n to the plot to just plot every 
n-th marker. For example:

import matplotlib.pyplot as plt
import numpy as np
N = 10000
x = np.linspace(-10.0,10.0,N)
plt.plot(x,np.sin(x),"-s",markevery=N/50)
plt.show()


Regards,
João Luís

Re: [Matplotlib-users] Scattered symbols data

[Clear <c.m...@gm...>]

plt.plot(x,np.sin(x),"-s",markevery=N/50)

I have tried your option but a message is returned to me which says that
markevery is an unknown property. I have included exactly the code you
propose. May I guess why I am getting such error?

Clear


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Re: [Matplotlib-users] Scattered symbols data

[João L. S. <js...@fc...>]

On 07/19/2010 03:11 PM, Clear wrote:
>
> plt.plot(x,np.sin(x),"-s",markevery=N/50)
>
> I have tried your option but a message is returned to me which says that
> markevery is an unknown property. I have included exactly the code you
> propose. May I guess why I am getting such error?
>
> Clear
>
>

Are you sure you ran the example as I sent it? markevery should be 
available since matplotlib version 0.98.5.2, released at the end of 
2008. Which mpl version and operating system are you using?

JLS

Re: [Matplotlib-users] Scattered symbols data

[Clear <c.m...@gm...>]

My MPL version is '0.98.5.2' and my OS is Ubuntu 9.04. I tried again but it
is still giving me that error. Weird.



João Luís Silva-2 wrote:
> 
> On 07/19/2010 03:11 PM, Clear wrote:
>>
>> plt.plot(x,np.sin(x),"-s",markevery=N/50)
>>
>> I have tried your option but a message is returned to me which says that
>> markevery is an unknown property. I have included exactly the code you
>> propose. May I guess why I am getting such error?
>>
>> Clear
>>
>>
> 
> Are you sure you ran the example as I sent it? markevery should be 
> available since matplotlib version 0.98.5.2, released at the end of 
> 2008. Which mpl version and operating system are you using?
> 
> JLS
> 
> 
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