matplotlib-users

[Matplotlib-users] stem plot with horizontal offset (BaseValue)

[ssinfod <ss...@gm...>]

Hello, 

I found this stem plot example:
http://matplotlib.org/examples/pylab_examples/stem_plot.html

I would like to add an horizontal offset to the step plot. (Ex: +2 on Y
axis)
What is the equivalent of the Matlab "BaseValue" offset in matplotlib.

See Reference:
http://www.mathworks.com/help/matlab/ref/stemseries-properties.html
http://stackoverflow.com/questions/21913995/vertically-offset-stem-plot

Thanks,
ssinfod




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Re: [Matplotlib-users] stem plot with horizontal offset (BaseValue)

[Sterling S. <sm...@fu...>]

I’m not going to claim this is the final answer, but in the documentation for the stem function[1], it specifically says that the horizontal line is drawn at 0.  

A workaround is to subtract the offset from your data, and relabel the axes….

[1]http://matplotlib.org/api/pyplot_api.html?highlight=stem#matplotlib.pyplot.stem
On Mar 31, 2015, at 11:31AM, ssinfod <ss...@gm...> wrote:

> Hello, 
> 
> I found this stem plot example:
> http://matplotlib.org/examples/pylab_examples/stem_plot.html
> 
> I would like to add an horizontal offset to the step plot. (Ex: +2 on Y
> axis)
> What is the equivalent of the Matlab "BaseValue" offset in matplotlib.
> 
> See Reference:
> http://www.mathworks.com/help/matlab/ref/stemseries-properties.html
> http://stackoverflow.com/questions/21913995/vertically-offset-stem-plot
> 
> Thanks,
> ssinfod
> 
> 
> 
> 
> --
> View this message in context: http://matplotlib.1069221.n5.nabble.com/stem-plot-with-horizontal-offset-BaseValue-tp45297.html
> Sent from the matplotlib - users mailing list archive at Nabble.com.
> 
> ------------------------------------------------------------------------------
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Re: [Matplotlib-users] stem plot with horizontal offset (BaseValue)

[Andrew D. <da...@at...>]

Looking at the source code indicates there is a 'bottom' keyword which
looks like it controls this, see
https://github.com/matplotlib/matplotlib/blob/v1.4.3/lib/matplotlib/axes/_axes.py#L2295

On 31 March 2015 at 19:31, ssinfod <ss...@gm...> wrote:

> Hello,
>
> I found this stem plot example:
> http://matplotlib.org/examples/pylab_examples/stem_plot.html
>
> I would like to add an horizontal offset to the step plot. (Ex: +2 on Y
> axis)
> What is the equivalent of the Matlab "BaseValue" offset in matplotlib.
>
> See Reference:
> http://www.mathworks.com/help/matlab/ref/stemseries-properties.html
> http://stackoverflow.com/questions/21913995/vertically-offset-stem-plot
>
> Thanks,
> ssinfod
>
>
>
>
> --
> View this message in context:
> http://matplotlib.1069221.n5.nabble.com/stem-plot-with-horizontal-offset-BaseValue-tp45297.html
> Sent from the matplotlib - users mailing list archive at Nabble.com.
>
>
> ------------------------------------------------------------------------------
> Dive into the World of Parallel Programming The Go Parallel Website,
> sponsored
> by Intel and developed in partnership with Slashdot Media, is your hub for
> all
> things parallel software development, from weekly thought leadership blogs
> to
> news, videos, case studies, tutorials and more. Take a look and join the
> conversation now. http://goparallel.sourceforge.net/
> _______________________________________________
> Matplotlib-users mailing list
> Mat...@li...
> https://lists.sourceforge.net/lists/listinfo/matplotlib-users
>

Re: [Matplotlib-users] stem plot with horizontal offset (BaseValue)

[ssinfod <ss...@gm...>]

In fact, I would like to draw other stem plots each at different offset.

Ex:
-+----_-----_--+-----_---

-+----_---+-_--+--_-----

-+--+-----_------+-----_-


I also found vlines but I have the same problem I don't know how to add a
horizontal offset to the values.
Ex:
import numpy
from matplotlib import pyplot
x = numpy.arange(10)
y = numpy.random.random(10)-0.5
pyplot.vlines(x, 0, y, color='red', bottom=2) # Stems
pyplot.plot(x, y, 'D')  # Stem ends
pyplot.plot([x.min(), x.max()], [0, 0], '--') # Middle bar
pyplot.grid(True)
pyplot.show()

ssinfod




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Re: [Matplotlib-users] stem plot with horizontal offset (BaseValue)

[ssinfod <ss...@gm...>]

It seems the 'bottom' parameter is the best for me.

Here is the code:
from pylab import *

x = linspace(0.1, 2*pi, 10)
markerline, stemlines, baseline = stem(x, cos(x), '-.', bottom=.5)
setp(markerline, 'markerfacecolor', 'b')
setp(baseline, 'color','r', 'linewidth', 2)

show()

Thanks for your inputs.
ssinfod



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