Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
457 views
in Technique[技术] by (71.8m points)

python - numpy merge sorted array to an new array?

Is there any way we can do something like merge in mergesort using numpy function?

some function like merge:

a = np.array([1,3,5])
b = np.array([2,4,6])
c = merge(a, b) # c == np.array([1,2,3,4,5,6])

I wish I could get high performance for large data thanks to numpy

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)

You can use

from numpy import concatenate, sort

c = concatenate((a,b))
c.sort(kind='mergesort')

I am afraid you can't do better than this, unless you write your own sorting function as a python extension, à la cython.

See this question for a similar problem, but keeping only the unique values in the merged array. The benchmarks and comments there are insightful as well.


与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...