MatrixX

MatrixX is a simple extension for PHP to help you do operation to matrix, based on PHP 5.6.12.

Install

• On Windows:
  Create a new project in Visual Studio to generate a dll. Import source code into the project, and compile. If you have set correctly, put the generated dll into Path/To/PHP/Installed/ext. Then add extension=php_MatrixX.dll in php.ini. Restart your web server (or php-fpm).
• On Linux: Use phpize to make and install a file with a .so suffix. As the same as on Windows, enable extension in php.ini.
  Notice: It has NOT been test on Linux.

Document

• matrix_init

MatrixX provide a resource type to save matrix. To create it, you have to use matrix_init() to initialize one.

$arr = [[3.25, 1.87, 2.111], [1.2, 2 ,33.1]];
$rMatrix = matrix_init($arr);
matrix_dump($rMatrix);

matrix_init() receive one param, should be an array or another matrix resource. If the param was an array, make sure the dimension of it is 1 or 2.
This function will return a resource if input is valid, and false if invalid.

• matrix_dump

matrix_dump() will print out the information of input resource, include columns, rows and the matrix.
The example above will print on sreen like this:

3.250000 1.870000 2.111000
1.200000 2.000000 33.100000
m:2
n:3

matrix_dump() need a resource as param, and return false for invalid input, true for valid.

• matrix_rows

matrix_rows() will return the rows of matrix in resource input, or false if input is invalid.

• matrix_cols

This function is similar to matrix_rows(), the different is it returns the columns.

$arr = [[3.25, 1.87,2.111],[1.2, 2,33.1]];
$rMatrix = matrix_init($arr);
echo "rMat.rows:" . matrix_rows($rMatrix) . " " .
    "rMat.cols:" . matrix_cols($rMatrix) . PHP_EOL;

Output looks like this:

rMat.rows:3 rMat.cols:2

• matrix_current

It will return an array with the same structure and elements of the matrix.
Based on the array above:

var_dump(matrix_current($rMatrix));

And ouptut is:

array (size=2)
0 =>
array (size=3)
0 => float 3.25
1 => float 1.87
2 => float 2.111
1 =>
array (size=3)
0 => float 1.2
1 => float 2
2 => float 33.1

• matrix_destroy

It will release the resource. A resource as the param is necessary.
Notice: You should not destroy one resource twice.

• matrix_add

2 params need, they could be one is real number, and other one is matrix resource; or both resources. It will return a matrix which is the addition of inputs. Especially if one of params is a real number, the result is all elements in other matrix will add this real number.

$arr = [[3.25, 1.87,2.111],[1.2, 2,33.1]];
$rMatrix = matrix_init($arr);
matrix_dump(matrix_add($rMatrix, 10))

This will have output:

13.250000 11.870000 12.111000
11.200000 12.000000 43.100000
m:2
n:3

Notice: Do NOT try to add two matrices with different columns or rows. It will cause a warning and return false.

• matrix_subtract

The same requirement as matrix_add(). But the return value is the remainder.

• matrix_product

It can do product of 2 matrices (if they can) or one matrix and a real number.

$arr1 = [[3.25, 1.87,2.111],[1.2, 2,33.1]];
$arr2 = [[2.00,0.3],[3.1,100],[1,12]];
$rMatrix1 = matrix_init($arr1);
$rMatrix2 = matrix_init($arr2);
matrix_dump(matrix_product($rMatrix1, $rMatrix2));

The return value is the product.

6.860000 4.340000 14.152000
130.075000 205.797000 3316.544100
17.650000 25.870000 399.311000
m:3
n:3

NOTICE: If the 2 input matrices do NOT fit the condition of doing product, a warning will be sent out and return false.

• matrix_divide

It will return the result of the product of 1st param and the inverse of 2nd param. If 2nd param is real, the same result as product of matrix and reciprocal of the real number.

$arr = [
    [1, -1, 2, 4],
    [2, -2, 4, 5],
    [3, 0, 6, 7]
];
$arr2 = [
    [3, 4, -1],
    [1, 0, 3],
    [2, 5, -4]
];
$rMatrix1 = matrix_init($arr);
$rMatrix2 = matrix_init($arr2);
matrix_dump(matrix_divide($rMatrix1, $rMatrix2));

It will return:

-4.300000 0.700000 -8.600000 -7.900000
4.000000 -1.000000 8.000000 8.000000
2.100000 -0.900000 4.200000 4.300000
m:3
n:4

NOTICE: Make sure 1st matrix can do product with the inverse of 2nd matrix. Obviously, the 2nd matrix should be invertible, or a real number as the divisor is NOT zero.

• matrix_inverse

It will return the inverse of input matrix, if it has.

$arr = [
    [3, 4, -1],
    [1, 0, 3],
    [2, 5, -4]
];
$rMatrix = matrix_init($arr);
matrix_dump(matrix_inverse($rMatrix));

And the output:

1.500000 -1.100000 -1.200000
-1.000000 1.000000 1.000000
-0.500000 0.700000 0.400000
m:3
n:3

• matrix_transpose

It will return the transpose matrix of input.

$arr = [
    [1, -1, 2, 4],
    [2, -2, 4, 5],
    [3, 0, 6, 7]
];
$rMatrix = matrix_init($arr);
matrix_dump(matrix_transpose($rMatrix));

The ouptut will be:

1.000000 2.000000 3.000000
-1.000000 -2.000000 0.000000
2.000000 4.000000 6.000000
4.000000 5.000000 7.000000
m:4
n:3

• matrix_rank

The return value is a long int which is the rank of the input matrix.

$arr = [
    [1, -1, 2, 1, 0],
    [2, -2, 4, -2, 0],
    [3, 0, 6, -1, 1],
    [0, 3, 0, 0, 1]
];
$rMatrix = matrix_init($arr);
echo matrix_rank($rMatrix);

Output is:

3

Support

Other functions will be add in future.