Home | MySQL Russian Manual | MySQL Manual | Apache HTTP Server Rus Documentation | Apache HTTP Server Documentation | downloads | faq

search for in the  Language: Russian


Mathematical Functions

  • Introduction
  • Installing/Configuring
  • Predefined Constants
  • Math Functions
    • abs — Absolute value
    • acos — Arc cosine
    • acosh — Inverse hyperbolic cosine
    • asin — Arc sine
    • asinh — Inverse hyperbolic sine
    • atan2 — Arc tangent of two variables
    • atan — Arc tangent
    • atanh — Inverse hyperbolic tangent
    • base_convert — Convert a number between arbitrary bases
    • bindec — Binary to decimal
    • ceil — Round fractions up
    • cos — Cosine
    • cosh — Hyperbolic cosine
    • decbin — Decimal to binary
    • dechex — Decimal to hexadecimal
    • decoct — Decimal to octal
    • deg2rad — Converts the number in degrees to the radian equivalent
    • exp — Calculates the exponent of e
    • expm1 — Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
    • floor — Round fractions down
    • fmod — Returns the floating point remainder (modulo) of the division of the arguments
    • getrandmax — Show largest possible random value
    • hexdec — Hexadecimal to decimal
    • hypot — Calculate the length of the hypotenuse of a right-angle triangle
    • is_finite — Finds whether a value is a legal finite number
    • is_infinite — Finds whether a value is infinite
    • is_nan — Finds whether a value is not a number
    • lcg_value — Combined linear congruential generator
    • log10 — Base-10 logarithm
    • log1p — Returns log(1 + number), computed in a way that is accurate even when the value of number is close to zero
    • log — Natural logarithm
    • max — Find highest value
    • min — Find lowest value
    • mt_getrandmax — Show largest possible random value
    • mt_rand — Generate a better random value
    • mt_srand — Seed the better random number generator
    • octdec — Octal to decimal
    • pi — Get value of pi
    • pow — Exponential expression
    • rad2deg — Converts the radian number to the equivalent number in degrees
    • rand — Generate a random integer
    • round — Rounds a float
    • sin — Sine
    • sinh — Hyperbolic sine
    • sqrt — Square root
    • srand — Seed the random number generator
    • tan — Tangent
    • tanh — Hyperbolic tangent

User Contributed Notes
Math
Anonymous:
23-Dec-2008 07:20
Here is a simple number digit counter function, I used it to check if a number is a palindrome or not, Plus a Distance function, slope formula, sum from one to an integer, sum of odd numbers from one to specified number, and last but not least the sum of the squares of the values of the sine of x, and the cosine of y.

<?php
function digit_count($num){
for(
$i=0;pow(10,$i)<=$num;$i++){
  if(
pow(10,$i+1)>$num){       
 
$num_digits = $i+1;           
  }
}
return
$num_digits;
}

function
distance($x_1,$y_1,$x_2,$y_2){
return
sqrt(pow($x_1-$x_2,2)+pow($y_1-$y_2,2));
}
   
function
slope($x_1,$y_1,$x_2,$y_2){
return (
$y_2-$y_1)/($x_2-$x_1);
}

// example sum(20)=210=1+2+3+...+20
function sum($x){
return (
$x)($x+1)/2;
}

// example odd(15)=225=1+3+5+7+9+...+15
function odd($x){
if((
$x%2) == 0){
$x-=1;
}
$y=($x+1)/2;
return
pow($y,2); //Same as $y*$y;
}

function (
$x,$y){
if(
$x=90-$y){
echo
"(Sine of $x)^2 + (Cosine of $y)^2=1";
$value = 1;
}else{
$value = pow(sin($x),2)+pow(cos($y),2);
}
return
$value;
}
?>
Sanjay Ichalkaranje
11-Oct-2008 08:34
This is the only function I searched that I did not find anywhere on the Internet. This function calculates standard normal cumulative distribution for a particular value. This is NORMSDIST(x) in MS-Excel or OpenOffice.org Calc program.

<?
function normalDist($zScore) {
   
$p = floatval(0.2316419);
   
$b1 = floatval(0.319381530);
   
$b2 = floatval(-0.356563782);
   
$b3 = floatval(1.781477937);
   
$b4 = floatval(-1.821255978);
   
$b5 = floatval(1.330274429);
   
$t = 1/(1 + ($p * floatval($zScore)));
   
$zx = (1/(sqrt(2 * pi())) * (exp(0 - pow($zScore, 2)/2)));

   
$px = 1 - floatval($zx) * (($b1 * $t) + ($b2 * pow($t, 2)) + ($b3 * pow($t, 3)) + ($b4 * pow($t, 4)) + ($b5 * pow($t,5)));
    return
$px;
}
?>
 

 
credits | contact