将每个元素乘以python中的两个列表列表

时间:2016-08-10 20:23:16

标签: python math

我有一个赋值,只使用基本的python函数生成以下列表(没有numpy)。这是我的所有代码:

#1.Create a list which contains i^2 with i = 1 through 5
squares = [pow(i,2) for i in range(1,6)]
#print squares

#2. Create a list which contains log[j] with j = 1 through 5
logs = map(math.log10,range(1,6))
#print logs

#3. Create a list which contains [i_1*j_1, i_2*j_2, i_3,j_3...]
def mult(x,y): return x*y
lmultl = map(mult,squares,logs)
#print lmultl

#4 Create a list which contains [[i_1*j_1, i_1*j_2, i_1*j_3...][i_2*j_1, i_2*j_2, i_2*j_3...]etc]
logslol = [[logs]*5] #Returns a list of lists with 5 copies of list "logs"
def lrep(x): return [x,x,x,x,x] #Returns a list w/ 5 copies of each integer 
squareslol= map(lrep,squares) #Returns list of lists "for squares"

print map(mult,logslol,squareslol) #Attempt 1 to create goal list
print [logslol*item for item in squareslol] #Attempt 2 to create goal list 

我的问题是针对列表#4中的最终打印语句:我得到一个TypeError:“不能将这两个方法的序列与'list'类型的非int相乘。”是否有更有效的方法将两个“列表列表”中的每个元素相乘?

2 个答案:

答案 0 :(得分:0)

尝试这种方法:

results = []
for i,j in zip(squares,logs)
     x = i*j
     results.append(x)

答案 1 :(得分:0)

import math
squares = [pow(i,2) for i in range(1,6)]
logs = map(math.log10,range(1,6))

mult = lambda x,y: x*y 
lmultl = map(mult,squares,logs)

我假设squares中的元素是i_1,i_2,i_3 ...... 和logs中的元素是j_1,j_2,j_3 ......

并且您想要创建一个列表,将squares的每个元素与logs的每个元素相乘,其中包含[[i_1 * j_1,i_1 * j_2,i_1 * j_3 ...] [i_2 * j_1,i_2 * j_2,i_2 * j_3 ...]等],然后使用以下代码: -

sqr_mul_log = [[m*n for m in logs ] for n in squares]

对于反向序列,即将logs的每个元素与squares的每个元素相乘,其中包含[[j_1 * i_1,j_1 * i_2,j_1 * i_3 ...] [j_2 * i_1, j_2 * i_2,j_2 * i_3 ...]等],然后使用以下代码: -

log_mul_sqr = [[m*n for m in squares] for n in logs]

此外,这将消除您在#4

创建的squareslollogslol创建的开销