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Questions tagged dataframe

89 questions · page 2 of 2

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8
votes
2
answers

Finding the column number and value the of second highest value in a row

r dataframe plyr
asked 2012-04-24T11:21:03.680
8
votes
7
answers

Function for median similar to "which.max" and "which.min" / Extracting median rows from a data.frame

r dataframe subset
asked 2012-04-21T05:30:43.580
37
votes
4
answers

use multiple columns as variables with sapply

r dataframe apply
asked 2012-04-09T18:56:15.590
12
votes
1
answers

How to copy row from one data.frame in to another [R]

r copy dataframe
asked 2012-04-04T15:10:07.490
17
votes
3
answers

Split dataframe into multiple output files

r split dataframe
asked 2012-04-03T21:57:32.903
72
votes
5
answers

Split data.frame based on levels of a factor into new data.frames

r dataframe r-faq
asked 2012-03-15T02:43:06.470
26
votes
7
answers

Using regexp to select rows in R dataframe

regex r dataframe
asked 2012-03-01T17:19:21.267
13
votes
4
answers

Remove all rows where length of string is more than n

r dataframe
asked 2011-12-27T01:24:25.270
11
votes
1
answers

Reorder column names in R by arbitrary specified order

r sorting dataframe
asked 2011-12-01T23:13:38.877
172
votes
3
answers

How to save a data frame in R?

r dataframe
asked 2011-12-01T17:37:54.687
25
votes
4
answers

Adding a column of means by group to original data

r dataframe
asked 2011-11-02T05:03:30.920
66
votes
4
answers

Rearrange dataframe to a table, the opposite of "melt"

r dataframe reshape
asked 2011-10-19T20:37:40.740
9
votes
4
answers

How to get a numbered list renumbering when a value changes

r dataframe
asked 2011-10-18T19:25:09.670
72
votes
2
answers

Merge data frames based on rownames in R

r merge dataframe
asked 2011-10-12T11:46:31.327
93
votes
4
answers

Elegant indexing up to end of vector/matrix

r matrix dataframe indexing
asked 2011-09-21T13:33:21.953
26
votes
4
answers

Removing specific rows from a dataframe

r dataframe rows
asked 2011-08-18T19:16:38.623
15
votes
5
answers

Dataframes in a list; adding a new variable with name of dataframe

list r dataframe names lapply
asked 2011-08-16T05:01:22.897
64
votes
9
answers

Find duplicated rows (based on 2 columns) in Data Frame in R

r duplicates dataframe
asked 2011-08-08T18:19:18.523
151
votes
3
answers

How do I combine two data-frames based on two columns?

r merge dataframe
asked 2011-07-15T15:07:53.507
14
votes
3
answers

How to display numeric columns in an R dataframe without scientific notation ('e+07')

r types dataframe
asked 2011-07-15T12:01:21.310
10
votes
5
answers

Paste together two dataframes element by element

r dataframe
asked 2011-06-20T07:25:04.843
57
votes
3
answers

How I can select rows from a dataframe that do not match?

r dataframe
asked 2011-04-28T01:05:55.043
384
votes
13
answers

How to drop columns by name in a data frame

r dataframe subset
asked 2011-03-08T14:56:26.070
56
votes
11
answers

Converting a data frame to xts

r dataframe coerce xts time-series
asked 2010-11-28T14:32:10.137
108
votes
7
answers

Sum rows in data.frame or matrix

r dataframe matrix rowsum
asked 2010-10-21T21:02:01.087
27
votes
2
answers

Extract Column from data.frame as a Vector

r vector dataframe
asked 2010-10-13T09:53:36.003
9
votes
4
answers

using R - delete rows when a value repeated less than 3 times

r row dataframe
asked 2010-10-12T21:32:26.990
34
votes
3
answers

R: Insert a vector as a row in data.frame

r dataframe
asked 2010-09-06T11:51:10.073
124
votes
8
answers

Creating an R dataframe row-by-row

list r dataframe
asked 2010-09-04T13:47:37.953
13
votes
1
answers

Subsetting a data frame based on contents of another data frame

r dataframe
asked 2010-08-10T18:33:46.717
39
votes
6
answers

How can I change XTS to data.frame and keep Index?

r time dataframe xts
asked 2010-08-02T10:24:15.237
33
votes
3
answers

In R, how do you loop over the rows of a data frame really fast?

r performance dataframe iteration rows
asked 2010-07-26T17:56:49.470
13
votes
7
answers

Last Observation Carried Forward In a data frame?

r matrix apply dataframe
asked 2010-05-05T19:22:53.070
216
votes
14
answers

Remove columns from dataframe where ALL values are NA

r apply dataframe
asked 2010-04-15T08:59:52.520
86
votes
3
answers

Convert a dataframe to a vector (by rows)

r dataframe vector r-faq
asked 2010-03-30T12:48:04.793
87
votes
8
answers

How to get row index number in R?

r dataframe
asked 2010-03-03T10:52:42.563
30
votes
7
answers

count of entries in data frame in R

r count dataframe
asked 2009-11-28T19:38:43.553
217
votes
9
answers

For each row in an R dataframe

r dataframe rows
asked 2009-11-09T04:08:53.147
368
votes
13
answers

How to access the last value in a vector?

r dataframe vector
asked 2008-09-16T21:40:29.927
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