matplotlib-users Mailing List for matplotlib

Joseph,
I'm a big fan of masked arrays in numpy. Your problem is typically what masked 
days are for: you can find an example here:
http://www.scipy.org/Cookbook/Matplotlib/Plotting_values_with_masked_arrays

Rodrigues, Joseph wrote:
> Made a boo boo, the image is not showing so here it is again
>
>
> -----Original Message-----
> From: mat...@li...
> [mailto:mat...@li...] On Behalf Of
> Bill Dandreta
> Sent: Friday, July 21, 2006 3:09 PM
> To: mat...@li...
> Subject: Re: [Matplotlib-users] iregular data set
>
> Rodrigues, Joseph wrote:
>   
>> I have a question (new user here): I have datasets of irregular time
>> spaced data and am having a problem with Matplot lib.
>>
>> I am plotting two datasets: one is continuous time series data (simple
>> line chart) and the other irregular time series data.
>>
>> The problem I have is: MatPlotLib is interpolating data for the
>> irregular data where there is no data.
>>
>> So if I have data from 1985 - 1989 then no data for 1990 - 1994,
>> matplotlib is drawing a line connecting the missing data.
>>
>> How does one plot irregular spaced time series data?
>>
>>     

 From what I see matplotlib is just connecting points.  Just because 
your x values have what you think are gaps, matplotlib doesn't know 
that.  I assume your two calls to plot use the x and y values for each 
plot.  Matplotlib will connect points that are sequential no matter what 
the x values are.  There may be ways to assign the y values as NANs for 
those "missing" x values.


-- 
Cheers,

Lou Pecora

Code 6362
Naval Research Lab
Washington, DC  20375
USA
Ph:  +202-767-6002
email:  pe...@an...

Made a boo boo, the image is not showing so here it is again


-----Original Message-----
From: mat...@li...
[mailto:mat...@li...] On Behalf Of
Bill Dandreta
Sent: Friday, July 21, 2006 3:09 PM
To: mat...@li...
Subject: Re: [Matplotlib-users] iregular data set

Rodrigues, Joseph wrote:
>
> I have a question (new user here): I have datasets of irregular time
> spaced data and am having a problem with Matplot lib.
>
> I am plotting two datasets: one is continuous time series data (simple
> line chart) and the other irregular time series data.
>
> The problem I have is: MatPlotLib is interpolating data for the
> irregular data where there is no data.
>
> So if I have data from 1985 - 1989 then no data for 1990 - 1994,
> matplotlib is drawing a line connecting the missing data.
>
> How does one plot irregular spaced time series data?
>
The way I do that is index the time data and plot against the index.

1985--0
1986--1
.
.
.
1989--4
1995--5
etc.

Bill

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Thanks to all who replied.
I am not sure if I get this or if I am not clear on what I want.  So I
am attaching a simple web page of what I want vs. what I get from
matplotlib.
Thanks again,
Joseph

-----Original Message-----
From: mat...@li...
[mailto:mat...@li...] On Behalf Of
Bill Dandreta
Sent: Friday, July 21, 2006 3:09 PM
To: mat...@li...
Subject: Re: [Matplotlib-users] iregular data set

Rodrigues, Joseph wrote:
>
> I have a question (new user here): I have datasets of irregular time
> spaced data and am having a problem with Matplot lib.
>
> I am plotting two datasets: one is continuous time series data (simple
> line chart) and the other irregular time series data.
>
> The problem I have is: MatPlotLib is interpolating data for the
> irregular data where there is no data.
>
> So if I have data from 1985 - 1989 then no data for 1990 - 1994,
> matplotlib is drawing a line connecting the missing data.
>
> How does one plot irregular spaced time series data?
>
The way I do that is index the time data and plot against the index.

1985--0
1986--1
.
.
.
1989--4
1995--5
etc.

Bill

------------------------------------------------------------------------
-
Take Surveys. Earn Cash. Influence the Future of IT
Join SourceForge.net's Techsay panel and you'll get the chance to share
your
opinions on IT & business topics through brief surveys -- and earn cash
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Rodrigues, Joseph wrote:
>
> I have a question (new user here): I have datasets of irregular time
> spaced data and am having a problem with Matplot lib.
>
> I am plotting two datasets: one is continuous time series data (simple
> line chart) and the other irregular time series data.
>
> The problem I have is: MatPlotLib is interpolating data for the
> irregular data where there is no data.
>
> So if I have data from 1985 – 1989 then no data for 1990 – 1994,
> matplotlib is drawing a line connecting the missing data.
>
> How does one plot irregular spaced time series data?
>
The way I do that is index the time data and plot against the index.

1985--0
1986--1
.
.
.
1989--4
1995--5
etc.

Bill

>>>>> "Rodrigues," == Rodrigues, Joseph <jor...@sf...> writes:

    Rodrigues> Yes, I am plotting two lines and am using two plots,
    Rodrigues> the two lines plots just fine in different colors,
    Rodrigues> however, one line is continuous from 1983 - 1995 and
    Rodrigues> the other dataset has irregular data points along the
    Rodrigues> same period of time.  So I should see a continuous
    Rodrigues> line for the first data set and I should see a broken
    Rodrigues> line only where there is data for the second.
    Rodrigues> Matplotlib is joining the broken points and forces
    Rodrigues> both datasets to appear as continuous.

matplotlib doesn't make any assumptions about whether data is
continuous or not.  It only knows about points and line styles.  If
you want a set of points to be connected, use a linestyle like '-'
(solid line) or '--' (dashed line)

  plot(x, y, '-')

if you don't want the points to be connected, use a marker like 'o'
for circles and 's' for squares

  plot(x, y, 's')

You will need to extract the subsets of the data that you want
connected yourself.  
JDH

Yes,

I am plotting two lines and am using two plots, the two lines plots just
fine in different colors, however, one line is continuous from 1983 -
1995 and the other dataset has irregular data points along the same
period of time.  So I should see a continuous line for the first data
set and I should see a broken line only where there is data for the
second.  Matplotlib is joining the broken points and forces both
datasets to appear as continuous.

=20

What do you think is the solution?

Thanks

Joseph

=20

  _____ =20

From: Michael Schwager [mailto:hw...@cy...]=20
Sent: Friday, July 21, 2006 2:33 PM
To: Rodrigues, Joseph; mat...@li...
Subject: RE: [Matplotlib-users] iregular data set

=20

Hi, I'm also new to matplotlib, but this sounds like a general type of
problem you might in find in matlab too.  I think you are trying to plot
two separate lines, one for the first set of time and one for the second
set of time.  If you don't want them connected then you must issue two
plot() commands, which means you have to split the data into the
sections that you want connected.

=20

Michael

=20

  _____ =20

From: mat...@li...
[mailto:mat...@li...] On Behalf Of
Rodrigues, Joseph
Sent: Friday, July 21, 2006 11:25 AM
To: mat...@li...
Subject: [Matplotlib-users] iregular data set

=20

I have a question (new user here): I have datasets of irregular time
spaced data and am having a problem with Matplot lib.

=20

I am plotting two datasets: one is continuous time series data (simple
line chart) and the other irregular time series data.

=20

The problem I have is: MatPlotLib is interpolating data for the
irregular data where there is no data.

=20

So if I have data from 1985 - 1989 then no data for 1990 - 1994,
matplotlib is drawing a line connecting the missing data.

=20

How does one plot irregular spaced time series data?

Thanks

Joseph

=20

p.s.: if this is the wrong forum, could you let me know where to post?

Hi, I'm also new to matplotlib, but this sounds like a general type of
problem you might in find in matlab too.  I think you are trying to plot two
separate lines, one for the first set of time and one for the second set of
time.  If you don't want them connected then you must issue two plot()
commands, which means you have to split the data into the sections that you
want connected.

 

Michael

 

  _____  

From: mat...@li...
[mailto:mat...@li...] On Behalf Of
Rodrigues, Joseph
Sent: Friday, July 21, 2006 11:25 AM
To: mat...@li...
Subject: [Matplotlib-users] iregular data set

 

I have a question (new user here): I have datasets of irregular time spaced
data and am having a problem with Matplot lib.

 

I am plotting two datasets: one is continuous time series data (simple line
chart) and the other irregular time series data.

 

The problem I have is: MatPlotLib is interpolating data for the irregular
data where there is no data.

 

So if I have data from 1985 - 1989 then no data for 1990 - 1994, matplotlib
is drawing a line connecting the missing data.

 

How does one plot irregular spaced time series data?

Thanks

Joseph

 

p.s.: if this is the wrong forum, could you let me know where to post?

I have a question (new user here): I have datasets of irregular time
spaced data and am having a problem with Matplot lib.

=20

I am plotting two datasets: one is continuous time series data (simple
line chart) and the other irregular time series data.

=20

The problem I have is: MatPlotLib is interpolating data for the
irregular data where there is no data.

=20

So if I have data from 1985 - 1989 then no data for 1990 - 1994,
matplotlib is drawing a line connecting the missing data.

=20

How does one plot irregular spaced time series data?

Thanks

Joseph

=20

p.s.: if this is the wrong forum, could you let me know where to post?

Hi all,

I don't like having to specify the marker on each call to plot(). So I
have something like this in my code:

import pylab as _p
_p.rc('lines', marker = 'o')

This works pretty well in the sense that each call to plot by default
uses the 'o' marker. However, now my graphs have markers on the axes
as well. I'm attaching a sample graph as an example.

So:

a) is this intended behavior? If so, whats the reasoning?
b) how can I turn it off? (btw, I just discovered that with
grid(True), the markers appear on each major tick. With grid(False),
they only appear at the corners. Doesn't solve the problem entirely
though).

Thanks,
Diwaker
-- 
Web/Blog/Gallery: http://floatingsun.net/blog

Please submit these kinds of bug reports to the sourceforge bug tracker. Minor 
problems like broken links do not need to be broadcast to over 480 people.

Thanks,
Darren


On Thursday 20 July 2006 11:54 pm, John Pye wrote:
> Hi,
>
> Just wanted to let you know that the link at to the Numeric Python
> tutorial at
>
>     http://matplotlib.sourceforge.net/tutorial.html
>
> is broken.
>
> Cheers
> JP

-- 
Darren S. Dale, Ph.D.
dd...@co...

Note: I just verified that this was introduced into 0.87.4.
0.87.3 doesn't exhibit the problem. See attachment.

Gary R.

gr...@bi... wrote:
> The following minimal script reveals a rendering problem with displaying a histogram on a log vertical axis.
> I'm using matplotlib0.87.4 in WinXP with python 2.3.5 Enthon.
> 
> from pylab import *
> hist(rand(100), 20, bottom=1)
> setp(gca(), yscale="log")
> show()
> 
> 
> Gary R.

The following minimal script reveals a rendering problem with displaying a histogram on a log vertical axis.
I'm using matplotlib0.87.4 in WinXP with python 2.3.5 Enthon.

from pylab import *
hist(rand(100), 20, bottom=1)
setp(gca(), yscale="log")
show()


Gary R.

Hi,

Just wanted to let you know that the link at to the Numeric Python
tutorial at

    http://matplotlib.sourceforge.net/tutorial.html

is broken.

Cheers
JP

-- 
John Pye
School of Mechanical and Manufacturing Engineering
The University of New South Wales
Sydney  NSW 2052  Australia
t +61 2 9385 5127
f +61 2 9663 1222
mailto:john.pye_AT_student_DOT_unsw.edu.au
http://pye.dyndns.org/