Re: [Matplotlib-users] verts

[Steven Boada]

Thanks Zach,

That simple little example makes more sense than the manual page did. 
Perhaps it's just late.

I appreciate it.

Steven

On Mon Apr  8 22:30:43 2013, Zachary Pincus wrote:
>> I've got some verts I stole from the internet that draws an upward arrow
>> (or a down arrow), but I need to draw an arrow to the right or to the
>> left. But I don't really understand verts and how they work.
>>
>> arrowup_verts = [[0.,0.], [-1., -1], [0.,0.], [0.,-2.],[0.,0.], [1,-1]]
>> arrowdown_verts = [[0.,0.], [-1., 1], [0.,0.], [0.,2.],[0.,0.], [1, 1]]
>>
>> plot them like...
>>
>> scatter(1,1,s=100, marker=None, verts=arrowup_verts)
>>
>>
>> Can someone make me new verts for the right and left arrow? Then, maybe
>> tomorrow, explain how I was supposed to know what to do.
>
> Draw a line from (0,0) to (-1, -1) on the X-Y plane, and then to (0,0) again, 
> and then continue so forth for all the (x,y) pairs in arrowup_verts. You will 
> notice they form a nice little arrow pointing up. (At some point in this 
> process, you should note that "verts" is short for "vertices". As in vertices 
> of a polygon or poly-line.)
>
> It would seem that the origin of the "verts" coordinate system is translated 
> to the (x,y) data position at which each marker is plotted.
>
> This should give you, I presume, sufficient information to figure out your 
> own left and right arrows, no? Or any other shape you should care to plot...
>
> Zach
>
>
>> Thanks y'all
>>
>> Steven
>>
>> --
>>
>> Steven Boada
>>
>> Doctoral Student
>> Dept of Physics and Astronomy
>> Texas A&M University
>> bo...@physics.tamu.edu
>>
>>
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bo...@physics.tamu.edu

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[Matplotlib-users] verts

[Steven Boada]

Hey List,

I've got some verts I stole from the internet that draws an upward arrow 
(or a down arrow), but I need to draw an arrow to the right or to the 
left. But I don't really understand verts and how they work.

arrowup_verts = [[0.,0.], [-1., -1], [0.,0.], [0.,-2.],[0.,0.], [1,-1]]
arrowdown_verts = [[0.,0.], [-1., 1], [0.,0.], [0.,2.],[0.,0.], [1, 1]]

plot them like...

scatter(1,1,s=100, marker=None, verts=arrowup_verts)


Can someone make me new verts for the right and left arrow? Then, maybe 
tomorrow, explain how I was supposed to know what to do.

Thanks y'all

Steven

-- 

Steven Boada

Doctoral Student
Dept of Physics and Astronomy
Texas A&M University
bo...@physics.tamu.edu


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Re: [Matplotlib-users] "zig-zag" to represent suppressed 0 on axis?

[Francesco Montesano]

Il giorno 08/apr/2013 21:05, "Kevin Hunter Kesling"  ha
scritto:
>
> At 4:20pm -0400 Sun, 07 Apr 2013, Francesco Montesano wrote:
>>
>> Il giorno 07/apr/2013 21:03, Kevin Hunter Kesling ha scritto:
>>
>>> On the other hand, I'm still such a noob at Matplotlib ... is there
>>> a way to have one of the subplots take up more than its default 50%
>>> allotment?
>>
>>
>> you can give a look at the last two plots in this example
>> http://matplotlib.org/examples/pylab_examples/demo_tight_layout.html or
use
>> plot.axes providing the rectangle that you want
>
>
> That is closer to what I want, but still not there.  I was finally able
to find something that fit the bill to 95% of what I want:
>
>
http://matplotlib.1069221.n5.nabble.com/Proposal-for-Broken-Axes-td38050.html
>
> The first post by 'klukas' does exactly what I asked for.  It's a zig-zag
on the Y-axis to show that what is graphed is not continuous, and unlike
the various "official" examples, the zig-zag placement is user-specifiable,
as opposed to exactly halfway between the top and bottom.
>
> The only thing I have yet to figure out how to do is to simultaneously
have a zig-zag on the X axis as well -- an artifact of how these zig-zags
must be created via multiple axes on the same figure, rather than as built
in to the axis artist.
>
> For googleability:
>
> The above linked graph code enables for matplotlib:
>
>  - suppressed zeros on the Y-axis of an XY plot
>  - showing suppressed data on the Y-axis
>  - lightning bolt symbol on the Y-axis
>  - zig-zag on the Y-axis
>  - a "broken" Y-axis
>
> Thanks for your pointers, Francesco, as they helped me to fine-tune my
Google search terms.  And thank you, Klukas, whoever you are.
>

I'm half that you found the solution for your problem and to have been
useful just providing links. This has been one of the easiest answer I have
ever given :)

And mostly thanks for sharing your findings.

cheers and good night,
Fra

> Cheers,
>
> Kevin
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Re: [Matplotlib-users] "zig-zag" to represent suppressed 0 on axis?

[ChaoYue]

Hi Kevin,

I don't check the link you provided very carefully. So I guess you already
find a solution.
otherwise I have done something similar before and have made a bit general
function to do
the job, which I think might be helpful for you.

You can check the following three functions at
https://github.com/ChaoYue/pylsce/blob/master/g.py

Calc_Newaxes_Fraction
Axes_Replace_Split_Axes
Axes_Set_Breakaxis

a working example is below:

>>> fig,axs = plt.subplots(nrows=2)
>>> bottom_ax, top_ax =
g.Axes_Replace_Split_Axes(fig,axs[0],split_fraction=[0.36,0.04,0.6],direction='v')
>>> g.Axes_Set_Breakaxis(bottom_ax, top_ax, 0.01,0.03,'v')
>>> left_ax, right_ax =
g.Axes_Replace_Split_Axes(fig,axs[1],split_fraction=[0.38,0.02,0.6],direction='h')
>>> g.Axes_Set_Breakaxis(left_ax, right_ax, 0.03,0.02,'h')

the figure is as attached.

cheers,

chao



On Mon, Apr 8, 2013 at 9:05 PM, Kevin Hunter [via matplotlib] <
ml-node+s1069221n40857...@n5.nabble.com> wrote:

> At 4:20pm -0400 Sun, 07 Apr 2013, Francesco Montesano wrote:
> > Il giorno 07/apr/2013 21:03, Kevin Hunter Kesling ha scritto:
> >> On the other hand, I'm still such a noob at Matplotlib ... is there
> >> a way to have one of the subplots take up more than its default 50%
> >> allotment?
> >
> > you can give a look at the last two plots in this example
> > http://matplotlib.org/examples/pylab_examples/demo_tight_layout.html or
> use
> > plot.axes providing the rectangle that you want
>
> That is closer to what I want, but still not there.  I was finally able
> to find something that fit the bill to 95% of what I want:
>
>
> http://matplotlib.1069221.n5.nabble.com/Proposal-for-Broken-Axes-td38050.html
>
> The first post by 'klukas' does exactly what I asked for.  It's a
> zig-zag on the Y-axis to show that what is graphed is not continuous,
> and unlike the various "official" examples, the zig-zag placement is
> user-specifiable, as opposed to exactly halfway between the top and
> bottom.
>
> The only thing I have yet to figure out how to do is to simultaneously
> have a zig-zag on the X axis as well -- an artifact of how these
> zig-zags must be created via multiple axes on the same figure, rather
> than as built in to the axis artist.
>
> For googleability:
>
> The above linked graph code enables for matplotlib:
>
>   - suppressed zeros on the Y-axis of an XY plot
>   - showing suppressed data on the Y-axis
>   - lightning bolt symbol on the Y-axis
>   - zig-zag on the Y-axis
>   - a "broken" Y-axis
>
> Thanks for your pointers, Francesco, as they helped me to fine-tune my
> Google search terms.  And thank you, Klukas, whoever you are.
>
> Cheers,
>
> Kevin
>
> --
>
> Minimize network downtime and maximize team effectiveness.
> Reduce network management and security costs.Learn how to hire
> the most talented Cisco Certified professionals. Visit the
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> below:
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> NAML
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break_axis.jpg (182K) 





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Re: [Matplotlib-users] "zig-zag" to represent suppressed 0 on axis?

[Kevin Hunter Kesling]

At 4:20pm -0400 Sun, 07 Apr 2013, Francesco Montesano wrote:
> Il giorno 07/apr/2013 21:03, Kevin Hunter Kesling ha scritto:
>> On the other hand, I'm still such a noob at Matplotlib ... is there
>> a way to have one of the subplots take up more than its default 50%
>> allotment?
>
> you can give a look at the last two plots in this example
> http://matplotlib.org/examples/pylab_examples/demo_tight_layout.html or use
> plot.axes providing the rectangle that you want

That is closer to what I want, but still not there.  I was finally able 
to find something that fit the bill to 95% of what I want:

http://matplotlib.1069221.n5.nabble.com/Proposal-for-Broken-Axes-td38050.html

The first post by 'klukas' does exactly what I asked for.  It's a 
zig-zag on the Y-axis to show that what is graphed is not continuous, 
and unlike the various "official" examples, the zig-zag placement is 
user-specifiable, as opposed to exactly halfway between the top and bottom.

The only thing I have yet to figure out how to do is to simultaneously 
have a zig-zag on the X axis as well -- an artifact of how these 
zig-zags must be created via multiple axes on the same figure, rather 
than as built in to the axis artist.

For googleability:

The above linked graph code enables for matplotlib:

  - suppressed zeros on the Y-axis of an XY plot
  - showing suppressed data on the Y-axis
  - lightning bolt symbol on the Y-axis
  - zig-zag on the Y-axis
  - a "broken" Y-axis

Thanks for your pointers, Francesco, as they helped me to fine-tune my 
Google search terms.  And thank you, Klukas, whoever you are.

Cheers,

Kevin

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Re: [Matplotlib-users] help plotting vector field in basemap

[Eric Firing]

On 2013/04/08 4:13 AM, epi wrote:
> Hi All,
>
> i'm new to basemap, truing to learn how to plot vector from a netcdf file
>
> the variables in my file are :
>
> - time
> - Significant_height_of_combined_wind_waves_and_swell_surface
> - u-component_of_wind_surface
> - v-component_of_wind_surface
>
> this is my code, the pcolormesh is fine
>
> 
>
> import netCDF4
> import datetime as dt
>
> import numpy as np
> import numpy.ma as ma
> from datetime import date, datetime, timedelta
>
> from mpl_toolkits.basemap import Basemap
>
>
>
> url='http://geoport.whoi.edu/thredds/dodsC/fmrc/NCEP/ww3/cfsr/4m/best'
> #url = 'http://geoport.whoi.edu/thredds/dodsC/fmrc/NCEP/ww3/cfsr/10m/best'
> nc = netCDF4.Dataset(url)
> #nc.variables.keys()
>
>
> time_var = nc.variables[str('time')]
> wave_var = 
> nc.variables['Significant_height_of_combined_wind_waves_and_swell_surface']
> date = datetime(1991,11,1,12)
> istart = netCDF4.date2index(date,time_var,select='nearest')
> lat = nc.variables['lat'][:]
> lon = nc.variables['lon'][:]
> uin = nc.variables['u-component_of_wind_surface'][istart,:,:]
> vin = nc.variables['v-component_of_wind_surface'][istart,:,:]
> var = wave_var[istart,:,:]
> wave = ma.masked_where(np.isnan(var),var)
>
>
> m = Basemap(llcrnrlon=-71.5,llcrnrlat=39.5,urcrnrlon=-63.0,urcrnrlat=46.0,\
>  lat_0=20.,lon_0=-60.,lat_ts=20.)
>
>
> lons, lats = np.meshgrid(lon,lat)
> x, y = m(lons, lats)
>
>
> m.pcolormesh(lon[:], lat[:], wave, vmin=0, vmax=3);
> m.quiver(x, y, uin, vin);

Try something like this:

m.quiver(x[::5,::5], y[::5,::5], uin[::5,::5], vin[::5,::5], scale=200);

You can use the scale and the scale_units kwargs to control the arrow 
lengths.  Quiver plots don't work visually when there are too many 
arrows, so given the scale of your plot, you need to subsample the wind 
vectors as illustrated.

Eric


>
>
> 
>
> .. but the vector plot in overlay doesn't render what i'm looking for .. 
> obviously my fault in the code
> thank you for your precious help!
>
>
> --
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[Matplotlib-users] help plotting vector field in basemap

[epi]

Hi All,

i'm new to basemap, truing to learn how to plot vector from a netcdf file

the variables in my file are :

- time
- Significant_height_of_combined_wind_waves_and_swell_surface
- u-component_of_wind_surface
- v-component_of_wind_surface

this is my code, the pcolormesh is fine 



import netCDF4
import datetime as dt

import numpy as np
import numpy.ma as ma
from datetime import date, datetime, timedelta

from mpl_toolkits.basemap import Basemap



url='http://geoport.whoi.edu/thredds/dodsC/fmrc/NCEP/ww3/cfsr/4m/best'
#url = 'http://geoport.whoi.edu/thredds/dodsC/fmrc/NCEP/ww3/cfsr/10m/best'
nc = netCDF4.Dataset(url)
#nc.variables.keys()


time_var = nc.variables[str('time')]
wave_var = 
nc.variables['Significant_height_of_combined_wind_waves_and_swell_surface']
date = datetime(1991,11,1,12)
istart = netCDF4.date2index(date,time_var,select='nearest')
lat = nc.variables['lat'][:]
lon = nc.variables['lon'][:]
uin = nc.variables['u-component_of_wind_surface'][istart,:,:]
vin = nc.variables['v-component_of_wind_surface'][istart,:,:]
var = wave_var[istart,:,:]
wave = ma.masked_where(np.isnan(var),var)


m = Basemap(llcrnrlon=-71.5,llcrnrlat=39.5,urcrnrlon=-63.0,urcrnrlat=46.0,\
lat_0=20.,lon_0=-60.,lat_ts=20.)


lons, lats = np.meshgrid(lon,lat)
x, y = m(lons, lats)


m.pcolormesh(lon[:], lat[:], wave, vmin=0, vmax=3);
m.quiver(x, y, uin, vin);




.. but the vector plot in overlay doesn't render what i'm looking for .. 
obviously my fault in the code
thank you for your precious help!


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