How do you use the ellipsis slicing syntax in Python?
This came up in Hidden features of Python, but I can’t see good documentation or examples that explain how the feature works. 4 … Read more
slice
How to join a slice of strings into a single string?
package main import ( “fmt” “strings” ) func main() { reg := […]string {“a”,”b”,”c”} fmt.Println(strings.Join(reg,”,”)) } gives me an error of: prog.go:10: cannot … Read more
How to get the last element of a slice?
What is the Go way for extracting the last element of a slice? var slice []int slice = append(slice, 2) slice = append(slice, … Read more
How to slice an array in Bash
Looking the “Array” section in the bash(1) man page, I didn’t find a way to slice an array. So I came up with … Read more
Explanation of [].slice.call in javascript?
I stumbled onto this neat shortcut for converting a DOM NodeList into a regular array, but I must admit, I don’t completely understand … Read more
How to delete an element from a Slice in Golang
fmt.Println(“Enter position to delete::”) fmt.Scanln(&pos) new_arr := make([]int, (len(arr) – 1)) k := 0 for i := 0; i < (len(arr) – 1); … Read more
Select rows in pandas MultiIndex DataFrame
What are the most common pandas ways to select/filter rows of a dataframe whose index is a MultiIndex? Slicing based on a single … Read more
ValueError: setting an array element with a sequence
This Python code: import numpy as p def firstfunction(): UnFilteredDuringExSummaryOfMeansArray = [] MeanOutputHeader=[‘TestID’,’ConditionName’,’FilterType’,’RRMean’,’HRMean’, ‘dZdtMaxVoltageMean’,’BZMean’,’ZXMean’,’LVETMean’,’Z0Mean’, ‘StrokeVolumeMean’,’CardiacOutputMean’,’VelocityIndexMean’] dataMatrix = BeatByBeatMatrixOfMatrices[column] roughTrimmedMatrix = p.array(dataMatrix[1:,1:17]) trimmedMatrix = … Read more
How to take column-slices of dataframe in pandas
I load some machine learning data from a CSV file. The first 2 columns are observations and the remaining columns are features. Currently, … Read more
Correct way to initialize empty slice
To declare an empty slice, with a non-fixed size, is it better to do: mySlice1 := make([]int, 0) or: mySlice2 := []int{} Just … Read more