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valuesIs.na () is used to test whether the object is Na,is.nan () to test whether the object is Nan. Na is Nan, but Nan is not na,nan much deeper than NA.10. Data frameThe data frame is used to store tabular data and is created with Data.frame (). You can treat a data frame as a special list collection, with the same

TRUEFALSE TRUEFALSE TRUE> x[good][11245Complete.cases () can also handle matrix data> airquality[1:6,] Ozone SOLAR.R Wind TempMonth Day1 A the 7.4 the 5 12 $ 118 8.0 the 5 23 A 149 12.6 About 5 34 - 313 11.5 + 5 45Na Na14.3 About 5 56 -NA14.9 the 5 6> Airquality[good, [1:6,] Ozone SOLAR.R Wind TempMonth Day1 A the 7.4 the 5 12 $

What is http://www.quora.com/What-is-data-science data science?Http://www.quora.com/How-do-I-become-a-data-scientist how can I become a data scientist?Http://www.quora.com/Data-

account... This is my certificate on python. The professor is very interesting. This course is very suitable for those who do not have any programming BASICS (such as me). I still remember the first class because I mixed python2 and python3, it took more than three hours to renew your account... The data science course is now charged. It is a series of courses.

basis (such as me) to learn, still remember the first class, because the Python2 and Python3 confused, Leng toss for 3 hours ... The course of data science is now charged and is a series of courses, and I went to two of them, of course, for free, and it was all about analytics, but not in Python but in the R language. I like the teacher in Python more than I do

queue are the previous ideas (Kemin: is a good case where data can be structured and adjusted based on specific problems) and applied to new problems. Finally, Part IV: the limits of computer science takes students through material that might normally be reserved for later theory courses, using the insights that students have developed for both algorithms and

separately and recommend some resources that will help us better understand machine learning and improve related skills. This classification of the learning phase is only my personal advice, and perhaps there are some resources in the pre-and post-classification phases that are appropriate for the current phase. I think it is very helpful to have a holistic understanding of machine learning, and I would like to hear your thoughts and tell me through the comments below! Beginner Stage Beginners

http://blog.csdn.net/pipisorry/article/details/44245575A very good article on how to learn python and use Python for data science, data analysis, machine learning Comprehensive learning Path–data Science in PythonDeep learning paths-da