Thanks for you reply Eric.
Since I am a beginner in matplotlib, I don't want to blame the soft first. I mean it could be a bug, but I have the feeling my code for masking the missing data is useless.
My real question is : How to mask data that do not exist ??? In the masked_demo.py example, it is show how to mask data from a set like "My data are
x=[1,2,3,4,5,6,7,8,9,10]
y = sin(x) or anyelse continuous fonction and I want to mask 1,2,3 so I write : ym = ma.masked_where(y <3, y)
But in my case, it is more like :
x = [1,2,3,4,7,8,9,15,16,17]
y = discrete values (no continuous fonction !) like [5,2,20,17,3,12,9,18,18,9]
What I want to do with these data :
1/plot graph with no line connecting the point (x,y) = (4,17) and the point (7,3), etc.
2/fill the space under the plot but do not fill the space where there is no data (eg between the same 2 points).
The 1st thing seems to be easy = just follow the example masked_demo
But in my case, how can I mask data that don't exist ? I can't write ym = ma.masked_where(y <3, y)
Hum, I hope I was clearer....
Michael
Eric Firing a �crit :
···
You have run into a bug in the combination of poly_between and fill--maybe only the former, which not taking masked arrays into account. I have not looked at it enough to know whether it will be easy or hard to fix, but it certainly should be fixed. I can't look at it more right now, unfortunately. > > Eric > > Micha�l Douchin wrote:
Hi list
I searched the list and google, but couldn't find a way to solve my pbm.
I have data stored in a list (from an sql query) , with these "columns":
x = time serie in hours
y = some level value
There are some missing values : eg between 08:33 and 08:40.
Here is my code :
sqla="SELECT * FROM import_parcelle a WHERE dat_loc='" + date_traite + "' AND code_uc='" + code_uc + "' ORDER BY a.heu_loc ;"
resa=db.query(sqla)
data=resa.dictresult() #x = time serie
x= [ datetime.datetime(*time.strptime(a["dat_loc"]+" "+a["heu_loc"],'%Y-%m-%d %H:%M:%S')[0:6] ) for a in data]
#y5 = tank level
y5= [float(a["niv_cuv"]) for a in data] # --> extraction de la colonne y1
figure()
# the plot command with no mask
plot_date(x,y5,color='b',linestyle='None',marker='',xdate=True,ydate=False)
#the mask
#ym5 = ma.masked_where(y5 <300, y5)
#plot_date(x,ym5,color='r',linestyle='-',xdate=True,ydate=False)
#the filling under the curve
xs, ys = poly_between(x, 0, y5)
fill(xs,ys)
Here is the result:
http://michaeldouchin.free.fr/17_2007-06-07_10B_vitesse.png
As you see, I commented the lines with the mask, because it did not change anything
To see what I am looking for, here is the result under R (a statistical tool)
http://michaeldouchin.free.fr/17_2007-06-07_10B_vitesse.jpg
As you see, between 08:48 and 08:50 (for example), there is a gap, showing we have no data for this interval.
As I want to automatically draw this graph for different set of data, I can't look each set in detail.
I tried to folow the example masked_demo.py, but I could not adapt it to my case....
Any hint ?
Thanks very much in advance
Michael
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