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Questions tagged dataframe

89 questions · page 1 of 2

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10
votes
2
answers

Serialize a dictionary containing pandas data-frames (Python)

python serialization dictionary pandas dataframe
asked 2013-07-28T10:50:59.737
33
votes
1
answers

Is it possible to modify a data.frame in-place (destructively)?

r dataframe data.table
asked 2013-07-26T21:43:53.260
64
votes
3
answers

Replace value for a selected cell in pandas DataFrame without using index

python pandas dataframe
asked 2013-07-18T17:08:17.710
11
votes
2
answers

adding 1 month to a date

r dataframe date xts zoo
asked 2013-07-16T15:50:07.140
71
votes
7
answers

How to sort pandas data frame using values from several columns?

python sorting dataframe pandas
asked 2013-07-12T15:54:28.233
19
votes
7
answers

R selecting all rows from a data frame that don't appear in another

r dataframe subset
asked 2013-07-02T14:13:37.280
22
votes
3
answers

Outputting a Dataframe in R to a .csv

r csv dataframe output
asked 2013-06-25T07:13:31.663
13
votes
1
answers

R - merge a list of data frames into one data frame with missing values by row

r merge dataframe do.call
asked 2013-06-18T14:23:24.720
531
votes
5
answers

How to sort a pandas dataFrame by two or more columns?

python pandas dataframe sorting data-analysis
asked 2013-06-17T06:28:47.340
121
votes
10
answers

Replace invalid values with None in Pandas DataFrame

python pandas dataframe replace nan
asked 2013-06-13T21:17:31.310
195
votes
5
answers

Python pandas: fill a dataframe row by row

python dataframe row pandas
asked 2013-06-13T16:02:32.103
9
votes
1
answers

Error when trying to apply log method to pandas data frame column in Python

python numpy pandas dataframe
asked 2013-06-06T17:27:34.363
38
votes
4
answers

Sort Pandas dataframe and print highest n values

pandas sorting dataframe max
asked 2013-06-06T09:30:01.890
8
votes
4
answers

How to plot density curves for each column in R?

r ggplot2 dataframe
asked 2013-06-04T03:06:07.257
13
votes
2
answers

Deleting a Row from a Time Indexed Dataframe

pandas time-series delete-row dataframe
asked 2013-05-17T15:47:03.063
70
votes
10
answers

Create an ID (row number) column

r dataframe r-faq
asked 2013-05-05T13:19:19.190
8
votes
1
answers

How to “flatten” or “collapse” a 2D data frame into a 1D data frame in R?

r 2d dataframe data.table
asked 2013-04-25T17:07:25.540
28
votes
2
answers

How to select columns programmatically in a data.table?

r dataframe data.table
asked 2013-04-25T11:32:13.163
10
votes
1
answers

Unlist all list elements in a dataframe

r dataframe
asked 2013-04-10T16:02:54.247
12
votes
4
answers

stacking columns into 1 column in R

r dataframe rows reshape
asked 2013-04-09T19:44:45.090
85
votes
2
answers

What is the difference between a dataframe and a list in R?

r list dataframe
asked 2013-04-09T11:56:52.883
8
votes
4
answers

Transfer values from one dataframe to another

r dataframe
asked 2013-03-09T11:28:40.357
204
votes
14
answers

GroupBy pandas DataFrame and select most common value

python pandas dataframe group-by mode
asked 2013-03-05T11:34:38.150
19
votes
8
answers

Complicated reshaping

r dataframe reshape2
asked 2013-03-03T05:50:32.577
22
votes
4
answers

Turn Pandas DataFrame of strings into histogram

python pandas matplotlib dataframe
asked 2013-02-21T00:37:38.323
34
votes
4
answers

python pandas extract unique dates from time series

python datetime dataframe pandas time-series
asked 2013-02-03T14:14:50.067
23
votes
3
answers

TimeGrouper, pandas

group-by dataframe pandas
asked 2013-01-28T19:03:20.737
34
votes
5
answers

Splitting a large data frame into smaller segments

r split dataframe
asked 2013-01-04T20:33:32.973
88
votes
1
answers

Merging a lot of data.frames

r dataframe merge
asked 2012-12-31T02:31:32.457
51
votes
3
answers

Import netCDF file to Pandas dataframe

python dataframe pandas netcdf
asked 2012-12-26T01:20:26.213
8
votes
3
answers

Fast melted data.table operations

r dataframe data.table aggregation reshape2
asked 2012-12-20T09:08:24.990
925
votes
8
answers

Creating an empty Pandas DataFrame, and then filling it

python pandas dataframe
asked 2012-12-09T02:50:38.060
232
votes
11
answers

Remove unwanted parts from strings in a column

python string pandas dataframe
asked 2012-12-03T11:11:56.090
17
votes
3
answers

writeClipboard for matrices or data frames?

r matrix dataframe clipboard
asked 2012-12-03T03:46:53.220
9
votes
2
answers

R - store a matrix into a single dataframe cell

r dataframe
asked 2012-11-22T01:42:21.713
128
votes
18
answers

Add (insert) a column between two columns in a data.frame

r dataframe insert
asked 2012-11-21T21:51:12.773
679
votes
16
answers

How to replace NaN values in a dataframe column

python pandas dataframe nan fillna
asked 2012-11-08T18:50:39.703
27
votes
3
answers

Saving and loading data.frames

r save dataframe
asked 2012-11-03T07:02:22.410
11
votes
3
answers

unique / sort in data.frame

r unique dataframe
asked 2012-10-29T21:02:42.460
19
votes
4
answers

Convert list to data frame while keeping list-element names

r list dataframe r-faq
asked 2012-09-28T11:52:53.193
62
votes
6
answers

Selecting columns in R data frame based on those *not* in a vector

r dataframe subset
asked 2012-08-31T02:16:05.100
445
votes
15
answers

pandas: filter rows of DataFrame with operator chaining

python pandas dataframe
asked 2012-08-08T17:25:37.780
155
votes
11
answers

String concatenation of two pandas columns

python string pandas numpy dataframe
asked 2012-08-08T05:57:33.220
29
votes
3
answers

Match values in data frame with values in another data frame and replace former with a corresponding pattern from the other data frame

r replace pattern-matching dataframe
asked 2012-07-17T20:15:26.467
128
votes
10
answers

Repeat rows of a data.frame

r dataframe rows repeat
asked 2012-06-20T14:04:47.377
526
votes
11
answers

Sorting columns in pandas dataframe based on column name

python pandas dataframe
asked 2012-06-16T21:05:01.030
77
votes
2
answers

Add column to index without resetting

python dataframe pandas
asked 2012-06-14T20:09:38.423
23
votes
5
answers

pandas: combine two columns in a DataFrame

python dataframe pandas
asked 2012-06-10T21:12:43.400
226
votes
4
answers

How to convert a table to a data frame

r dataframe
asked 2012-05-25T17:35:18.957
1429
votes
32
answers

Create a Pandas Dataframe by appending one row at a time

python pandas dataframe append
asked 2012-05-23T08:12:31.843
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