Nov 16, 2012 · Actually addresses the WHY part of original question. I've implemented subclasses from pandas dataframe. Doing so will teach you vital part of this answer. Differentiating attributes and …

50 What is the difference between as.data.frame(x) and data.frame(x) functions in R? In this following example, the result is the same at the exception of the columns names.

Sep 8, 2012 · 17 Create id column in your data frame or use any column name to identify the row. Using index is not fair to delete. Use subset function to create new frame.

Oct 16, 2015 · Update index after sorting data-frame Asked 10 years, 4 months ago Modified 4 years, 7 months ago Viewed 276k times

1 I would simply add a new column to the data frame with the name I want and get the data for it from the existing column. like this:

Aug 11, 2016 · The short answer is, Python always does pass-by-value, but every Python variable is actually a pointer to some object, so sometimes it looks like pass-by-reference. In Python every …

Mar 8, 2011 · I have a large data set and I would like to read specific columns or drop all the others.

50 As mentioned in this comment, the standard suggestions for re-ordering columns in a data.frame are generally cumbersome and error-prone, especially if you have a lot of columns. This function allows …

I want to sort a data frame by multiple columns. For example, with the data frame below I would like to sort by column 'z' (descending) then by column 'b' (ascending): dd <- data.frame (b = facto...

Subset / filter rows in a data frame based on a condition in a column Asked 15 years, 6 months ago Modified 3 years, 5 months ago Viewed 363k times