f(x)
Simple math functions., (*1)
use Jstewmc\Fx;
(new Constant(1))(3); // returns 1
(new Equality())(3); // returns 3
(new Linear(1, 2))(3); // returns 5 (1 * 3 + 2)
(new Quadratic(1, 2, 3))(4); // returns 27 (1 * 4 ^ 2 + 2 * 4 + 3)
(new Power(1, 2))(3); // returns 9 (1 * 3 ^ 2)
(new Exponential(1))(2); // returns 1 (1 ^ 2)
This library supports the following functions:, (*2)
- constant,
c = x
- equality,
y = x
- linear,
y = mx + b
- quadratic,
y = ax2 + bx + c
- power,
y = cxp
- exponential,
y = bx
Constant
A constant function where c = x:, (*3)
use Jstewmc\Fx
$fx = new Constant(1);
$fx(1); // returns 1
$fx(2); // returns 1
$fx(3); // returns 1
Equality
An equality where y = x:, (*4)
use Jstewmc\Fx;
$fx = new Equality();
$fx(1); // returns 1
$fx(2); // returns 2
$fx(3); // returns 3
Linear
A linear function is y = mx + b, where m is the slope and b is the y-intercept:, (*5)
use Jstewmc\Fx;
$fx = new Linear(1, 2);
$fx(1); // returns 3 (1 * 1 + 2)
$fx(2); // returns 4 (1 * 2 + 2)
$fx(3); // returns 5 (1 * 3 + 2)
Quadratic
A univariate, standard-form quadratic function is y = ax2 + bx + c, where a, b, and c are constants_ (aka, the _quadratic coefficient, the linear coefficient, and the constant, respectively):, (*6)
use Jstewmc\Fx;
$fx = new Quadratic(1, 2, 3);
$fx(1); // returns 5 (1 * 1 ^ 2 + 2 * 1 + 3)
$fx(2); // returns 11 (1 * 2 ^ 2 + 2 * 2 + 3)
$fx(3); // returns 18 (1 * 3 ^ 2 + 2 * 3 + 3)
Power
A power function is y = cxp, where c is a constant, and p is the power:, (*7)
use Jstewmc\Fx;
$fx = new Power(1, 2);
$fx(1); // returns 1 (1 * 1 ^ 2)
$fx(2); // returns 4 (1 * 2 ^ 2)
$fx(3); // returns 9 (1 * 3 ^ 2)
Exponential
An exponential function is y = bx, where b is a constant:, (*8)
use Jstewmc\Fx;
$fx = new Exponential(2);
$fx(1); // returns 2 (2 ^ 1)
$fx(2); // returns 4 (2 ^ 2)
$fx(3); // returns 8 (2 ^ 3)
That's it!, (*9)
License
MIT, (*10)
Author
Jack Clayton, (*11)
Version
1.0.0, August 13, 2016
- Major release
- Update
composer.json
0.3.1, August 13, 2016
- Update
Fx parent class to be an interface
0.3.0, August 6, 2016
0.2.0, August 6, 2016
- Update README examples
- Add
Equality function
- Add
Constant function
0.1.0, July 30, 2016
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