小编Tim*_*art的帖子

我在pandas中有一个数据帧,用于生成散点图,并希望为绘图包含回归线.现在我正试着用polyfit做这件事.

这是我的代码:

import pandas as pd
import matplotlib
import matplotlib.pyplot as plt
from numpy import *

table1 = pd.DataFrame.from_csv('upregulated_genes.txt', sep='\t', header=0, index_col=0)
table2 = pd.DataFrame.from_csv('misson_genes.txt', sep='\t', header=0, index_col=0)
table1 = table1.join(table2, how='outer')

table1 = table1.dropna(how='any')
table1 = table1.replace('#DIV/0!', 0)

# scatterplot
plt.scatter(table1['log2 fold change misson'], table1['log2 fold change'])
plt.ylabel('log2 expression fold change')
plt.xlabel('log2 expression fold change Misson et al. 2005')
plt.title('Root Early Upregulated Genes')
plt.axis([0,12,-5,12])

# this is the part I'm unsure about
regres = polyfit(table1['log2 fold change misson'], table1['log2 …

我试图从我用csv文件制作的字典中提取一组随机的键值对.字典包含基因信息,基因名称是字典键,数字列表(与基因表达等相关)是值.

# python 2.7.5
import csv
import random

genes_csv = csv.reader(open('genes.csv', 'rb'))

genes_dict = {}
for row in genes_csv:
    genes_dict[row[0]] = row[1:]

length = raw_input('How many genes do you want? ')

for key in genes_dict:
    random_list = random.sample(genes_dict.items(), int(length))
    print random_list

问题是,如果我试图得到100个基因的列表(例如),它似乎迭代整个字典并返回100个基因的每个可能的组合.

我正在尝试迭代python 2.7.5中的列表列表,并返回第二个列表中找到第一个值的列表,如下所示:

#python 2.7.5
list1 = ['aa', 'ab', 'bb', 'bc', 'cc']
list2 = [['aa', 1, 3, 7],['de', 2, 2, 1],['bc', 3, 4, 4]]

list3 = []
for x in list1:
    for y in list2:
        if x == y:
            list3.append(y)

所以我希望list3包含[['aa',1,3,7],['bc', 3, 4, 4]]但是我得到了整个list2.