plot time on X axis

[Peter Pearson]

On Wed, 07 Jun 2017 09:20:25 -0300, jorge.conrado at cptec.inpe.br wrote:
[snip]
> I was an IDL user and I'm using Python. I have several meteorological 
> daily time seriee for several years. Please can someone help me. I would 
> like to plot on X axis only the values o the year.

Is matplotlib allowed?  Example (Python 2.7)(Note that most of
this example is just parsing data, not plotting:):

from matplotlib import pyplot as plt
from datetime import date
import re

dwcd = """
    2014-06-01:  82.00% ( 1)  89.50% ( 2)  39.00% ( 1)      0.259
    2014-07-01: 100.00% ( 1)  89.00% ( 3)   0.00% ( 1)      0.264
    2014-08-01:  79.50% ( 2)  85.50% ( 4)  53.00% ( 1)      0.273
    2014-09-01:  85.00% ( 3)  98.00% ( 6)  87.00% ( 3)      0.495
    2014-10-01:  86.00% ( 7)  97.00% (10)  82.50% ( 4)      0.553
    2014-11-01:  93.50% (10)  98.50% (10)  39.00% ( 6)      0.215
    2014-12-01:  97.00% (10) 100.00% (10)  66.50% ( 6)      0.025
    2015-01-01:  72.50% (12)  94.00% (11)  39.00% ( 6)      0.025
    2015-02-01:  66.00% (12)  88.50% (12)  58.50% ( 8)      0.248
    2015-03-01:  79.00% (15)  95.50% (12)  77.00% ( 9)      0.360
    2015-04-01:  87.00% (15)  95.50% (12)  68.00% ( 9)      0.039
    2015-05-01:  85.50% (18)  90.00% (12)  87.00% ( 9)      0.479
"""

def get_time(r):
    r = r.strip()
    return date(year=int(r[0:4]),
                month=int(r[5:7]),
                day=int(r[8:10]))

def get_field(r, field_name):
    m = re.match(r"(?P<date>[^:]+): +"
                 r"(?P<value_a>[0-9.]+)% +"
                 r"\( *(?P<n_a>[0-9]+)\) +"
                 r"(?P<value_b>[0-9.]+)% +"
                 r"\( *(?P<n_b>[0-9]+)\) +"
                 r"(?P<value_c>[0-9.]+)% +"
                 r"\( *(?P<n_c>[0-9]+)\) +"
                 r"(?P<p>[0-9.]+)", r.strip())
    return m.group(field_name)

x = [get_time(r) for r in dwcd.split("\n") if r]
y_a = [float(get_field(r, "value_a")) for r in dwcd.split("\n") if r]
y_b = [float(get_field(r, "value_b")) for r in dwcd.split("\n") if r]
y_c = [float(get_field(r, "value_c")) for r in dwcd.split("\n") if r]

plt.plot(x, y_a, color="red", label="Group A")
plt.plot(x, y_b, color="green", label="Group B")
plt.plot(x, y_c, color="blue", label="Group C")

plt.plot(date(2015,5,20), 101, marker="x", color="white")  

plt.ylabel("Y label")
plt.legend(loc="upper left")
fig = plt.gcf()
fig.autofmt_xdate()
plt.show()


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