Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Programming Articles
Page 19 of 2546
How to divide the data frame rows in R by row standard deviation?
To divide the data frame row values by row standard deviation in R, we can follow the below steps −First of all, create a data frame.Then, use apply function to divide the data frame row values by row standard deviation.Creating the data frameLet's create a data frame as shown below −> x y df dfOn executing, the above script generates the below output(this output will vary on your system due to randomization) − x y 1 1.48 0.86 2 -0.14 -0.58 3 -0.25 1.22 4 0.18 0.25 5 0.50 0.68 6 -1.34 -0.21 ...
Read MorePHP asinh() Function
Definition and UsageThe asinh() function calculates inverse of hyperbolic sine of given parameter. In other words, the return value of asinh() is hyperbolic sine of given parameter. A inverse hyperbolic sine function is defined asasinh(x) = log(x+sqrt(pow(x,2)+1))This function returns a float value.Syntaxasinh( float $arg ) : floatParametersSr.NoParameter & Description1argA floating point value whose inverse hyperbolic sine is to be calculatedReturn ValuesPHP asinh() function returns inverse hyperbolic sine ratio of given parameter.PHP VersionThis function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.ExampleOutputThis will produce following result −asinh(3.1415926535898) = 1.8622957433108
Read MoreWhy do we need generics in Java?
Reference typesAs we know a class is a blue print in which we define the required behaviors and properties and, an interface is similar to class but it is a Specification (containing abstract methods).These are also considered as datatypes in Java, unlike other primitive datatypes a literal of these kind of types points/refers to the location of the object. They are also known as reference types.GenericsGenerics is a concept in Java where you can enable a class, interface and, method, accept all (reference) types as parameters. In other words it is the concept which enables the users to choose the ...
Read MorePHP bindec() Function
Definition and UsageThe bindec() function returns decinmal equivalent of a binary number represented as a string argument. Binary number inside string is interpreted as unigned integer.This function returns a decimal integer. However, it may return float for size reasons.Syntaxbindec ( string $binary_string ) : numberParametersSr.NoParameter & Description1binary_stringA string containing binary number representation. Invalid characters (other than 1 and 0) are ignored.Return ValuesPHP bindec() function returns decimal equivalent of given binary number inside string.PHP VersionThis function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.Example
Read MorePHP ceil() Function
Definition and UsageThe ceil() function is an in-built function in PHP iterpreter. This function accepts any float number as argument and rounds it up to the next highest integer.This function always returns a float number as range of float is bigger than that of integer.Syntaxceil ( float $num ) : floatParametersSr.NoParameter & Description1numThe number to be rounded up.Return ValuesPHP ceil() function returns the smallest integer value that is bigger than or equal to given parameter.PHP VersionThis function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.ExampleOutputThis will produce following result −ceil(-3.95) = -3
Read MorePHP cos() Function
Definition and UsageThe cos() function returns the cosine ratio of given angle in radians. In trigonometry, cosine of an angle is defined as ratio of lengths of adjacent side and hypotenuse.cos(x) = adjacent/hypotenuseIf x=90 degree, cos(x) = 0.This function returns a float value.Syntaxcos ( float $arg ) : floatParametersSr.NoParameter & Description1argA floating point value that represents angle in radiansReturn ValuesPHP cos() function returns cosine ratio of given parameter.PHP VersionThis function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.ExampleOutputThis will produce following result −cos(3.1415926535898) = -1
Read MorePHP decbin() Function
Definition and UsageThe decbin() function returns a string that contains binary equivalent of given decimal number argument.This function returns a string with binary digits.Syntaxdecbin ( int $number ) : stringParametersSr.NoParameter & Description1numberA decimal number to be converted in equivalent binary representationReturn ValuesPHP decbin() function returns a binary number inside string.PHP VersionThis function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.ExampleOutputThis will produce following result −decbin(-10) = 1111111111111111111111111111111111111111111111111111111111110110
Read MorePHP dechex() Function
Definition and UsageThe dechex() function returns a string that contains hexadecimal equivalent of given decimal number argument.This function returns a string with hexadecimal characters.Syntaxdechex ( int $number ) : stringParametersSr.NoParameter & Description1numberA decimal number to be converted in equivalent hexadecimal representationReturn ValuesPHP dechex() function returns a hexadecimal number inside string.PHP VersionThis function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.ExampleOutputThis will produce following result −dechex(-10) = fffffffffffffff6
Read MorePHP deg2rad() Function
Definition and UsageMost trigonometric functions like sin, cos, tan etc require angle argument in radians. The deg2rad() function proves useful in conversion of degrees to radians.This function returns a float number such that number=deg2rad(x) where is angle in degrees. angle in radian = angle in deg *180/piFor example deg2rad(30) is equal to 0.5235987755983 radiansSyntaxdeg2rad ( float $number ) : floatParametersSr.NoParameter & Description1numberA float number reprsenting angle in degreesReturn ValuesPHP deg2rad() function returns a float number that represents angle in radians.PHP VersionThis function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.ExampleOutputThis will produce following result −deg2rad(45) ...
Read MorePHP expm1() Function
Definition and UsageThe expm1() function returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero, a case where 'exp (number) - 1' would be inaccurate due to subtraction of two numbers that are nearly equal.expm1(x) = exp(x) - 1This function returns a float value .Syntaxexpm1 ( float $arg ) : floatParametersSr.NoParameter & Description1argA floating point number whose expm1 is to be calculated.Return ValuesPHP expm1() function returns a floating point value.PHP VersionThis function is available in PHP versions 4.x, PHP 5.x as well as PHP 7.x.ExampleOutputThis will produce following result ...
Read More