apply Questions
13
Solved
I have a pandas DataFrame, df_test. It contains a column 'size' which represents size in bytes. I've calculated KB, MB, and GB using the following code:
df_test = pd.DataFrame([
{'dir': '/Users/u...
7
Solved
I tried this:
// mod.js
var a = 1;
this.b = 2;
exports.c = 3;
// test.js
var mod = require('./mod.js');
console.log(mod.a); // undefined
console.log(mod.b); // 2
console.log(mod.c); // 3, so this...
Formication asked 28/2, 2012 at 2:56
7
Solved
I want to apply a function with arguments to a series in python pandas:
x = my_series.apply(my_function, more_arguments_1)
y = my_series.apply(my_function, more_arguments_2)
...
The documentatio...
3
Solved
I have a Python Pandas dataframe df:
d = [['hello', 1, 'GOOD', 'long.kw'],
[1.2, 'chipotle', np.nan, 'bingo'],
['various', np.nan, 3000, 123.456]]
t = pd.DataFrame(data=d, columns=['A','B','C','D...
3
Solved
I want to apply a function to a rolling window. All the answers I saw here are focused on applying to a single row / column, but I would like to apply my function to the entire window. Here is a si...
Illlooking asked 5/5, 2019 at 9:33
2
Solved
I have 2 dataframes:
The main one df
Another dataframe tmp which describes columns types of df and the New_format on which columns should be converted
Here is a reproducible example:
df <- dat...
5
Solved
I would like to use Pandas df.apply but only for certain rows
As an example, I want to do something like this, but my actual issue is a little more complicated:
import pandas as pd
import math
z ...
2
I want to apply a patch to a file in the current directory. The path in the patch file says just a/FILETOPATCH.something b/FILETOPATCH.something. If I use this with git apply it isn't working. The ...
3
Solved
I have a data.frame where some cells contain strings of comma separate values:
d <- data.frame(a=c(1:3),
b=c("name1, name2, name3", "name4", "name5, name6"),
c=c("name7","name8, name9", "na...
5
Solved
I tried to perform independent t-test for many columns of a dataframe. For example, i created a data frame
set seed(333)
a <- rnorm(20, 10, 1)
b <- rnorm(20, 15, 2)
c <- rnorm(20, 20, 3)
...
7
Solved
I have a dataframe (in Python 2.7, pandas 0.15.0):
df=
A B C
0 NaN 11 NaN
1 two NaN ['foo', 'bar']
2 three 33 NaN
I want to apply a simple function for rows that does not contain NULL values in...
2
Solved
I have a pandas dataframe 'df' with two columns 'A' and 'B', I have a function with two arguments
def myfunction(B, A):
# do something here to get the result
return result
and I would like to ...
1
I want to pass each row of a Polars DataFrame into a custom function.
def my_complicated_function(row):
# ...
return result
df = pl.DataFrame({
"foo": [1, 2, 3],
"bar"...
Holguin asked 29/3, 2022 at 8:42
7
Solved
Suppose I have a n by 2 matrix and a function that takes a 2-vector as one of its arguments. I would like to apply the function to each row of the matrix and get a n-vector. How to do this in R?
F...
8
Solved
I'm trying to get the min/max for each column in a large data frame, as part of getting to know my data. My first try was:
apply(t,2,max,na.rm=1)
It treats everything as a character vector, beca...
3
Solved
I often have the problem that R converts my one column data frames into character vectors, which I solve by using the drop=FALSE option.
However, there are some instances where I do not know how to...
3
Solved
I have the following data frame my_df:
Person event time
---------------------------------
John A 2017-10-11
John B 2017-10-12
John C 2017-10-14
John D 2017-10-15
Ann X 2017-09-01
Ann Y 2017-09-02...
Petua asked 23/10, 2017 at 17:35
6
Solved
I want to use the apply function on a dataframe, but only apply the function to the last 5 columns.
B<- by(wifi,(wifi$Room),FUN=function(y){apply(y, 2, A)})
This applies A to all the columns ...
1
I am trying to move uncommited changes from a local git repository to another local repository.
On repo 1 I create a patch like this:
git diff > my_patch.patch
Inspecting the patch:
more my_pat...
Koren asked 29/4, 2020 at 8:10
2
Solved
I have a vector of values:
y=c(2,3,4,4,3,2,1,1)
And a list of vectors of positions:
l=list(c(1,2),c(2,3),c(3,4),c(4,5),c(5,6),c(6,7),c(7,8),c(8,1))
I'd like to replace the value of y by NAs (or o...
4
Solved
Let's say I've got a dataframe with multiple columns, some of which I want to transform. The column names define what transformation needs to be used.
library(tidyverse)
set.seed(42)
df <- data....
5
Solved
I have this example matrix and I want to change the entries of the matrix with "YES" or "NO" based on a conditional if statement.
a<-c(5,1,0,3,2,0.6,1.6,7,9,0)
b<-c(11,0,1...
Thoron asked 15/8, 2021 at 11:16
1
Solved
I want to apply a function on groups of a data frame and get the function output as a new column.
Here is the function that I wrote:
def get_centroids(sample):
# Ideally, re = complex_function(s...
5
Solved
I have a large data frame, df, containing 4 columns:
id period ret_1m mkt_ret_1m
131146 CAN00WG0 199609 -0.1538 0.047104
133530 CAN00WG0 199610 -0.0455 -0.014143
135913 CAN00WG0 199611 0.0000 0.0...
Defend asked 15/1, 2016 at 1:36
6
Solved
I need to convert many columns that are numeric to factor type.
An example table:
df <- data.frame(A=1:10, B=2:11, C=3:12)
I tried with apply:
cols<-c('A', 'B')
df[,cols]<-apply(df[,co...
© 2022 - 2024 — McMap. All rights reserved.