Matplotlib初体验

为一个客户做了关于每个差异otu在时间点上变化的折线图，使用python第一次做批量作图的程序，虽然是很简单的折线图，但是也是第一次使用matplotlib的纪念。

ps：在第一个脚本上做了点小的改动，加上了分类信息作为图的标题，加上网格便于对照y轴丰度值，x轴的名称更加接近样品的实际名称。

 1 from __future__ import division
 2 import numpy as np
 3 import matplotlib.pyplot as plt
 4 from matplotlib.ticker import MultipleLocator, FormatStrFormatter
 5 import sys
 6
 7 def main():
 8     file = sys.argv[1]
 9     x = np.array([0,6,12,18])
10     mean_file = [‘../c-%dm_vs_cf-%dm.mean.profile‘%(t,t) for t in [0,6,12,18]]
11     with open(file) as f:
12         f.next()
13         for line in f:
14             C = []
15             CF = []
16             tabs = line.strip().split(‘\t‘)
17             otu_name = tabs.pop(0)
18             for file in mean_file:
19                 (C_temp,CF_temp) = getMeanProfile(otu_name,file)
20                 C.append(float(C_temp))
21                 CF.append(float(CF_temp))
22             C = np.array(C)
23             CF = np.array(CF)
24             tax_name = tax[otu_name]
25             do_plot(tax_name,otu_name,x,C,CF)
26         f.close()
27
28 def getMeanProfile(otu_name,file):
29     handle = open(file)
30     handle.next()
31     for line in handle:
32         tabs = line.strip().split(‘\t‘)
33         if otu_name != tabs[0]:
34             continue
35         return( (tabs[1],tabs[2]) )
36     handle.close()
37
38 def do_plot(title,file_name,x,y1,y2):
39     plt.figure(figsize=(10,6))
40     ax = plt.subplot(111)
41     plt.plot(x,y1,label="C",color="red",linewidth=2)
42     plt.plot(x,y2,label="CF",color="blue",linewidth=2)
43     xmajorLocator = MultipleLocator(6)
44     xmajorFormatter = FormatStrFormatter(‘%dm‘)
45     yRange = ( max(np.max(y1),np.max(y2)) - min(np.min(y1),np.min(y2)) )
46     ymajorLocator = MultipleLocator(yRange/10)
47     yminorLocator = MultipleLocator(yRange/40)
48     ax.xaxis.set_major_locator(xmajorLocator)
49     ax.xaxis.set_major_formatter(xmajorFormatter)
50     ax.yaxis.set_major_locator(ymajorLocator)
51     ax.yaxis.set_minor_locator(yminorLocator)
52     ax.xaxis.grid(True,which=‘major‘)
53     ax.yaxis.grid(True,which=‘minor‘)
54     plt.xlabel("Month(s)")
55     plt.ylabel("mean_profile")
56     plt.title(title)
57     plt.legend()
58     plt.savefig("%s.png"%file_name,dpi=80)
59
60 def getTax():
61     for line in open(‘../tax.txt‘):
62         tabs = line.strip().split(‘\t‘)
63     for line in open(‘../tax.txt‘):
64         tabs = line.strip().split(‘\t‘)
65         tax[tabs[0]] = tabs[1].split(‘;‘)[-1]
66
67 if __name__ == ‘__main__‘:
68     tax = {}
69     getTax()
70     main()