I would like to show some simple examples for matrix and vector arithmetic in PHP with NumPHP.

I assume that NumPHP is installed with composer.

```
$matrix1 = new NumArray(
[
[ 2, -45, -9/2],
[ 7.7, -2, 8]
]
);
$matrix2 = new NumArray(
[
[ 7/8, -7],
[ 4, 0.091],
[ 0, -34]
]
);
$matrix1->dot($matrix2);
echo $matrix1;
```

The output of this example will be
```
NumArray([
[-178.25, 134.905],
[-1.2625, -326.082]
])
```

```
// this will create a 3x3 matrix with entries from 1 to 9
$matrix = NumPHP::arange(1, 9)->reshape(3, 3);
$vector = new NumArray(
[3/4, -5, 8.7]
);
$matrix->dot($vector);
echo $matrix;
```

The output of this example will be
```
NumArray([16.85, 30.2, 43.55])
```

More matrix and vector arithmetic operation can be found under readthedocs.org