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Simultaneously merge multiple data.frames in a list
....frame(i = c("c","d","a"), l = 7:9, stringsAsFactors=FALSE)
Update June 2018: I divided the answer in three sections representing three different ways to perform the merge. You probably want to use the purrr way if you are already using the tidyverse packages. For comparison purposes below, you'll...
How do I get the picture size with PIL?
...emuephimuemue
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9
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Javascript Regex: How to put a variable inside a regular expression?
...licious content (e.g. the variable comes from user input)
ES6 Update
In 2019, this would usually be written using a template string, and the above code has been updated. The original answer was:
var regex = new RegExp("ReGeX" + testVar + "ReGeX");
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string.replace(regex, "replacement");
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How to serve an image using nodejs
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2016 Update
Examples with Express and without Express that actually work
This question is over 5 years old but every answer has some problems.
TL;DR
Scroll down for examples to serve an image with:
express.static
express...
Writing data into CSV file in C#
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var csv = new StringBuilder();
//in your loop
var first = reader[0].ToString();
var second = image.ToString();
//Suggestion made by KyleMit
var newLine = string.Format("{0},{1}", first, second);
csv.AppendLine(newLine);
//after your loop
File.WriteAllText(filePath, c...
Show/hide 'div' using JavaScript
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440
How to show or hide an element:
In order to show or hide an element, manipulate the element's s...
Is it good practice to NULL a pointer after deleting it?
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Setting a pointer to 0 (which is "null" in standard C++, the NULL define from C is somewhat different) avoids crashes on double deletes.
Consider the following:
Foo* foo = 0; // Sets the pointer to 0 (C++ NULL)
delete foo; // Won't do anything
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Converting BigDecimal to Integer
...il Bourque
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answered Oct 28 '10 at 14:01
willcodejavaforfoodwillcodejavaforfood
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Qt: can't find -lGL error
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edited Jul 30 '18 at 14:05
Rando Hinn
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answered A...
How to get memory available or used in C#
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edited Apr 11 '18 at 8:03
Red Taz
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answered Ap...