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Function to clear the console in R and RStudio
I am wondering if there is a function to clear the console in R and, in particular, RStudio I am looking for a function that I can type into the console, and not a keyboard shortcut.
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Google Maps V3 - How to calculate the zoom level for a given bounds
... longitude, and then take the smaller (further out) of the two.
Here is a function that uses both latitude and longitude:
function getBoundsZoomLevel(bounds, mapDim) {
var WORLD_DIM = { height: 256, width: 256 };
var ZOOM_MAX = 21;
function latRad(lat) {
var sin = Math.sin(lat...
Split comma-separated strings in a column into separate rows
..., "B", "B", "B", "B", "A")
library(data.table)
library(magrittr)
Define function for benchmark runs of problem size n
run_mb <- function(n) {
# compute number of benchmark runs depending on problem size `n`
mb_times <- scales::squish(10000L / n , c(3L, 100L))
cat(n, " ", mb_times, "...
Check if application is installed - Android
...pp")
and the call the following method to check if the app is installed
fun isInstalled(intent:Intent) :Boolean{
val list = context.packageManager.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY)
return list.isNotEmpty()
}
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How to convert String to Long in Kotlin?
...dix] is not a valid radix for string to number conversion.
public inline fun String.toLong(radix: Int): Long = java.lang.Long.parseLong(this, checkRadix(radix))
4. string.toLongOrNull(10)
Parses the string as a [Long] number and returns the result or null
if the string is not a valid repre...
Check if character is number?
...if you want to work directly on your string you can use regexp like this:
function is_numeric(str){
return /^\d+$/.test(str);
}
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How to programmatically round corners and set random background colors
...st call this on a view like this myView.setRoundedBackground(Color.WHITE)
fun View.setRoundedBackground(@ColorInt color: Int) {
addOnLayoutChangeListener(object: View.OnLayoutChangeListener {
override fun onLayoutChange(v: View?, left: Int, top: Int, right: Int, bottom: Int, oldLeft: In...
Java; String replace (using regular expressions)?
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Fun thing is that the replaceAll method implicitly does Pattern.compile(regex).matcher(testString).replaceAll(regexReplacementString)! So, if you re-use the pattern this way, redundant objects will be avoided. Further, as @Ma...
How can I set the focus (and display the keyboard) on my EditText programmatically
... a kotlin extension for showing and hiding the soft keyboard can be made:
fun View.showKeyboard() {
this.requestFocus()
val inputMethodManager = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
inputMethodManager.showSoftInput(this, InputMethodManager.SHOW_IMPLICIT...
C++应用程序添加VBScript和JavaScript支持 - C/C++ - 清泛网 - 专注IT技能提升
...uction
I am always amazed to see how the script control (msscript.ocx) is fun to use and at the same time how C++ developers reacted when it's time to use. Maybe the extension (.ocx) make them feel, it's visual basic! In this article, I would like to remove those frontiers and give some new reasons...