apply Questions
3
I am using Proxy to Proxy an object. The getter and setter work fine like expected. However, the apply method is never called.
var p = new Proxy({}, {
/* getter */
get(target, name) {
return t...
Strabismus asked 5/6, 2016 at 20:56
3
Solved
I have a DataFrame like this:
df = pd.DataFrame({'col0': list('aabb'),
'col1': np.arange(4),
'col2': list('wxyz'),
'col3': np.nan})
col0 col1 col2 col3
0 a 0 w NaN
1 a 1 x NaN
2 b 2 y NaN
3 b...
Cierracig asked 17/6, 2021 at 17:58
1
Solved
I know how to apply a function to all columns present in a Pandas-DataFrame. However, I have not figured out yet how to achieve this when using a Polars-DataFrame.
I checked the section from the Po...
Decode asked 4/6, 2021 at 9:33
4
Solved
I'm working through an R tutorial and suspect that I have to use one of these functions but I'm not sure which (Yes I researched them but until I become more fluent in R terminology they are quite ...
3
Solved
I started to study Scheme and I do not understand some of it. I'm using DrRacket.
I wrote the following code:
(define mult_mat
(λ (A B)
(Trans_Mat (map (λ (x) (mul_Mat_vec A x))
(Trans_Mat B))...
6
Solved
I'm writing a global error handling "module" for one of my applications.
One of the features I want to have is to be able to easily wrap a function with a try{} catch{} block, so that all calls to...
Flamboyant asked 28/11, 2008 at 20:26
3
Solved
I want to expand the list entries of a dataframe using the information in column i:
i s_1 s_1 s_3
2 [1, 2, 3] [3, 4, 5] NaN
1 NaN [0, 0, 0] [2]
The i value just indicates how often the last value ...
1
Solved
Is it possible to use panda's expanding function to calculate the coefficient of a polynomial regression using several columns of the window object?
I have a data frame which has two columns, a pre...
Cosgrave asked 17/4, 2021 at 13:32
3
I have a datetime series of dtype: float64. I am trying to apply a custom function to a rolling window on the series. I want this function to return strings. However, this generates a TypeError. Wh...
Cowardice asked 24/2, 2021 at 0:12
6
Solved
I recently wrote this line of code: for(i in seq_len(exponent)){out<-squareMat%*%out}. Clearly, i is never used and I just wanted to say "exponent times, do out<-squareMat%*%out". W...
Thea asked 4/2, 2021 at 13:19
7
Solved
I have a dataframe with a timeindex and 3 columns containing the coordinates of a 3D vector:
x y z
ts
2014-05-15 10:38 0.120117 0.987305 0.116211
2014-05-15 10:39 0.117188 0.984375 0.122070
2014-...
Fugacity asked 15/5, 2014 at 23:21
8
Solved
I created a data frame with random values
n <- 50
df <- data.frame(id = seq (1:n),
age = sample(c(20:90), n, rep = TRUE),
sex = sample(c("m", "f"), n, rep = TRUE, prob = c(0.55, 0.45))
)
...
3
Solved
I am trying to calculate the percentile rank of data by column within a rolling window.
test=pd.DataFrame(np.random.randn(20,3),pd.date_range('1/1/2000',periods=20),['A','B','C'])
test
Out[111]: ...
Ulloa asked 9/8, 2016 at 16:57
3
Solved
i have a nested list whose fundamental element is data frames, and i want to traverse this list recursively to do some computation of each data frame, finally to get a nested list of results in the...
2
Solved
I have a small DF (2rows x 4cols). And a function that will add an extra column depending on some logic, once the apply is performed. With Pandas 0.24.2 I've been doing this as df.apply(func, axis=...
4
Solved
I have a large number of files for which I have to carry out calculations based on string columns. The relevant columns look like this.
df = pd.DataFrame({'A': ['A', 'B', 'A', 'B'], 'B': ['B', 'C',...
3
Solved
I have this string vector (for example):
str <- c("this is a string current trey",
"feather rtttt",
"tusla",
"laq")
To count the number of words in this vector I used this (as given here C...
3
Solved
I'm using the apply method on a panda's DataFrame object. When my DataFrame has a single column, it appears that the applied function is being called twice. The questions are why? And, can I stop t...
2
Solved
Consider the following data frame:
set.seed(5678)
sub_df<- data.frame(clustersize= rep(1, 4),
lepsp= c("A", "B", "C", "D"),
dens= round(runif(4, c(0, ...
5
I have a Dataframe which has three columns: nums with some values to work with, b which is always either 1 or 0 and the result column which is currently zero everywhere except in the first row (bec...
Reticule asked 3/6, 2020 at 10:2
4
Solved
I'm trying to infer a classification according to the size of a person in a dataframe like this one:
Size
1 80000
2 8000000
3 8000000000
...
I want it to look like this:
Size Classification
1...
Argumentation asked 19/2, 2018 at 18:34
2
I have been following a similar answer here, but I have some questions when using sklearn and rolling apply. I am trying to create z-scores and do PCA with rolling apply, but I keep on getting 'onl...
2
Solved
I have been scouring SO for the best way of applying a function that takes multiple separate Pandas DataFrame columns and outputs multiple new columns in the same said DataFrame. Let's say I have t...
4
I want to creat a column s['C'] using apply() with a Pandas DataFrame.
My dataset is similiar to this:
[In]:
s=pd.DataFrame({'A':['hello', 'good', 'my', 'pandas','wrong'],
'B':[['all', 'say',...
7
I have two arrays,
const pets = ["dog", "cat", "hamster"]
const wishlist = ["bird", "snake"]
I want to append wishlist to pets, which can be done using two methods,
Method 1:
pets.push.apply...
Delectate asked 27/9, 2016 at 4:54
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