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Drop data frame columns by name
...cars
colnames(dat)
# [1] "mpg" "cyl" "disp" "hp" "drat" "wt" "qsec" "vs" "am" "gear"
# [11] "carb"
dat[,c("mpg","cyl","wt")] <- list(NULL)
colnames(dat)
# [1] "disp" "hp" "drat" "qsec" "vs" "am" "gear" "carb"
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What is the most efficient way to concatenate N arrays?
...s is very slow for arrays containing objects, see: jsperf.com/array-concat-vs-array-push-vs-array-spread/1
– hitautodestruct
Jun 11 at 6:06
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Detect IE version (prior to v9) in JavaScript
...ning in IE7 standards mode? msdn.microsoft.com/en-us/library/ie/cc196988(v=vs.85).aspx
– mason81
Nov 19 '13 at 22:35
4
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Get a list of all threads currently running in Java
...ernatives, but I've worked with other Java means of gathering stack traces vs just a list of threads. The performance impact seems to depend very strongly on which JVM you are using (JRockit vs Sun JVM for example). It's worth measuring in your specific instance. Whether or not it will affect you...
Resetting generator object in Python
... too many values, that can be unpractical.
So you have the classic memory vs. processing tradeoff. I can't imagine a way of rewinding the generator without either storing the values or calculating them again.
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UnicodeDecodeError when reading CSV file in Pandas with Python
...python')
Alternate Solution:
Open the csv file in Sublime text editor or VS Code.
Save the file in utf-8 format.
In sublime, Click File -> Save with encoding -> UTF-8
Then, you can read your file as usual:
import pandas as pd
data = pd.read_csv('file_name.csv', encoding='utf-8')
and the ...
.append(), prepend(), .after() and .before()
... answered Dec 21 '14 at 12:57
VSri58VSri58
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What's the difference between a file descriptor and file pointer?
...ely available to Windows, e.g. msdn.microsoft.com/en-us/library/z0kc8e3z%28VS.80%29.aspx
– kennytm
Mar 11 '10 at 9:16
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OwinStartup not firing
...e I was able to do so before. I tried to open an app in a browser, then in VS2013 to use "Debug-> Attach to Process", and then to reload a page in a browser. VS didn't stop. I know that OWIN Startup is executing: I put some logging into it for debug purposes. It's like back in a dark age of inter...
How to name factory like methods?
... How would you rate from? E.g. taking a hypothetical Id.of("abc") vs Id.from("xyz") … or would from suggest more logic happening (i.e. parsing of the input, lookup/correlation from/with other data, …)? It is really difficult to search for "of vs from" :D
– knittl
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