Questions tagged [reshape]
In R, Matlab, NumPy and APL, reshape functions allow data to be transformed into more convenient forms.
reshape
455
questions
383
votes
15
answers
493k
views
How to reshape data from long to wide format
I'm having trouble rearranging the following data frame:
set.seed(45)
dat1 <- data.frame(
name = rep(c("firstName", "secondName"), each=4),
numbers = rep(1:4, 2),
value = rnorm(8)
)...
- 5,937
251
votes
9
answers
334k
views
Reshaping data.frame from wide to long format
I have some trouble to convert my data.frame from a wide table to a long table.
At the moment it looks like this:
Code Country 1950 1951 1952 1953 1954
AFG Afghanistan 20,249 ...
- 11.7k
55
votes
8
answers
26k
views
Reshaping multiple sets of measurement columns (wide format) into single columns (long format)
I have a dataframe in a wide format, with repeated measurements taken within different date ranges. In my example there are three different periods, all with their corresponding values. E.g. the first ...
- 7,113
30
votes
9
answers
9k
views
Transpose / reshape dataframe without "timevar" from long to wide format
I have a data frame that follows the below long Pattern:
Name MedName
Name1 atenolol 25mg
Name1 aspirin 81mg
Name1 sildenafil 100mg
Name2 atenolol 50mg
Name2 ...
- 315
163
votes
6
answers
130k
views
Split delimited strings in a column and insert as new rows [duplicate]
I have a data frame as follow:
+-----+-------+
| V1 | V2 |
+-----+-------+
| 1 | a,b,c |
| 2 | a,c |
| 3 | b,d |
| 4 | e,f |
| . | . |
+-----+-------+
Each of the alphabet is ...
- 5,097
151
votes
6
answers
113k
views
Reshape three column data frame to matrix ("long" to "wide" format) [duplicate]
I have a data.frame that looks like this.
x a 1
x b 2
x c 3
y a 3
y b 3
y c 2
I want this in matrix form so I can feed it to heatmap to make a plot. The result should look something like:
...
- 2,011
35
votes
5
answers
52k
views
Reshape multiple value columns to wide format
I have the following data frame and i want to use cast to create a "pivot table" with columns for two values (value and percent).
Here is the data frame:
expensesByMonth <- structure(list(month = ...
- 3,125
117
votes
5
answers
127k
views
Gather multiple sets of columns
I have data from an online survey where respondents go through a loop of questions 1-3 times. The survey software (Qualtrics) records this data in multiple columns—that is, Q3.2 in the survey will ...
- 38k
32
votes
2
answers
41k
views
dcast warning: ‘Aggregation function missing: defaulting to length’
My df looks like this:
Id Task Type Freq
3 1 A 2
3 1 B 3
3 2 A 3
3 2 B 0
4 1 A 3
4 1 B 3
4 2 A 1
4 ...
- 543
25
votes
3
answers
10k
views
Intuition and idea behind reshaping 4D array to 2D array in NumPy
While implementing a Kronecker-product for pedagogical reasons (without using the obvious and readily available np.kron()), I obtained a 4 dimensional array as an intermediate result, which I've to ...
- 60.1k
-1
votes
1
answer
10k
views
Using Reshape from wide to long in R [closed]
I am trying to reshape Data from wide to long in R.
my data in wide format looks like this:
I have the following Data-Matrix:
in the rows i have the different companies, and in the columns in have ...
- 85
114
votes
6
answers
220k
views
Pandas long to wide reshape, by two variables
I have data in long format and am trying to reshape to wide, but there doesn't seem to be a straightforward way to do this using melt/stack/unstack:
Salesman Height product price
Knut ...
- 6,949
1
vote
2
answers
2k
views
R Reshape data frame from long to wide format? [duplicate]
What's the best way to convert the data frame below from long to wide format? I tried to use reshape but didn't get the desired results.
2015 PROD A test1
2015 PROD A blue
2015 PROD A 50
...
- 549
43
votes
5
answers
74k
views
Reshaping wide to long with multiple values columns [duplicate]
I need to reshape my wide table into long format but keeping multiple fields for each record, for example:
dw <- read.table(header=T, text='
sbj f1.avg f1.sd f2.avg f2.sd blabla
A 10 6 ...
- 8,586
677
votes
12
answers
696k
views
What does -1 mean in numpy reshape?
A 2D array can be reshaped into a 1D array using .reshape(-1).
For example:
>>> a = numpy.array([[1, 2, 3, 4], [5, 6, 7, 8]])
>>> a.reshape(-1)
array([[1, 2, 3, 4, 5, 6, 7, 8]])
...
- 7,217