Trigonometric Routines

---

sin

public static sin($x) : CArray

Trigonometric sine, element-wise.

Parameters

CArray|Array $x Input array.

Returns

CArray The sine of each element of $x.

Examples

Example 1

$a = CArray::linspace(-pi(), pi(), 10);
echo CArray::sin($a);

[ -0.00000000  -1.00000000   0.00000000   1.00000000   0.00000000 ]

---

tan

public static tan($x) : CArray

Compute tangent element-wise. Equivalent to CArray::sin(x)/CArray::cos(x).

Parameters

CArray|Array $x Input array.

Returns

CArray The tangent of each element of $x.

Examples

Example 1

echo CArray::tan([-pi(), pi()/2, pi()]);

[ 1.224647e-16  1.633124e+16  -1.224647e-16 ]

---

arcsin

public static arcsin($x) : CArray

Inverse sine, element-wise.

Parameters

CArray|Array $x Input array.

Returns

CArray The inverse sine of each element in $x.

Examples

Example 1

echo CArray::arcsin(1);

1.570796

---

arccos

public static arccos($x) : CArray

Trigonometric inverse cosine, element-wise.

Parameters

CArray|Array $x Input array.

Returns

CArray The inverse cosine of each element in $x.

Examples

Example 1

echo CArray::arccos([1, -1]);

[ 0.00000000  3.14159265 ]

---

arctan

public static arctan($x) : CArray

Trigonometric inverse tangent, element-wise.

Parameters

CArray|Array $x Input array.

Returns

CArray The inverse tangent of each element in $x.

Examples

Example 1

echo CArray::arctan([0, 1]);

[ 0.00000000  0.78539816 ]