subset
Sort a list according to order defined by another list
How开发者_开发问答 can I sort the elements of the list A so that they follow the ordering of another (superset) list B?Assume no duplicates.[详细]
2023-01-11 19:46 分类:问答Remove rows from a single-column data frame
When I try to remove the last row from a single column data frame, I get a vector back instead of a data frame:[详细]
2023-01-06 17:51 分类:问答How to isolate/retrieve/count a subset of returned records in Rails
I\'m writing a reports dashboard for a rails app.The dashboard is for user data, and currently it开发者_运维百科\'s running multiple count an select queries to build the four or five reports on the pa[详细]
2023-01-05 18:56 分类:问答R error promise already under evaluation when using subset in function but no error in script
I\'m getting a strange error when I run the following function: TypeIDs=c(18283,18284,17119,17121,17123,17125,17127,17129,17131,17133,18367,18369,18371,18373,18375,18377,18379)[详细]
2023-01-04 04:33 分类:问答What is the better approach to find if a given set is a perfect subset of a set - If given subset is not sorted?
What is the best approach to find if a given set(unsorted) is a perfect subset of a main set. I got to do some validation in my program where I got to compare the clients request set with the register[详细]
2023-01-01 01:55 分类:问答Algorithm: Removing as few elements as possible from a set in order to enforce no subsets
I got a problem which I do not know how to solve: I have a set of sets A = {A_1, A_2, ..., A_n} and I have a set B.[详细]
2022-12-30 16:03 分类:问答Filtering subsets using Linq
Imagine a have a very long enunumeration, too big to reasonably 开发者_如何学运维convert to a list. Imagine also that I want to remove duplicates from the list. Lastly imagine that I know that only a[详细]
2022-12-30 13:00 分类:问答Finding the product of each of the (n-1) subsets of a given array
I\'m sorry for deleting the original question, here it is: We have a bag or an array of n integers, we need to find the product of each of the (n-1) subsets. e.g:[详细]
2022-12-27 16:00 分类:问答R: How to pass a list of selection expressions (strings in this case) to the subset function?
Her开发者_如何学编程e is some example data: data = data.frame(series = c(\"1a\", \"1b\", \"1e\"), reading = c(0.1, 0.4, 0.6))[详细]
2022-12-26 20:52 分类:问答What's the higher-performance alternative to for-loops for subsetting data by group-id?
A recurring analysis paradigm I encounter in my research is the need to subset based on all different group id values, performing statistical analysis on each group in turn, and putting the results in[详细]
2022-12-24 15:38 分类:问答