NdArray::vander


          SciPhp\NdArray 
          NdArray::vander(
          [
            int
            $num
          ])

The columns of the output matrix are powers of the vector.

$num: A positive integer. Number of columns to generate. If not specified, a square array is returned ($num = count($matrix)).


use SciPhp\NumPhp as np;

$m = np::ar([1, 2, 3, 4])->vander();

echo "m\n$m";

The above example will output:

m
[[1   1   1   1 ]
 [8   4   2   1 ]
 [27  9   3   1 ]
 [64  16  4   1 ]]


use SciPhp\NumPhp as np;

$m = np::ar([1, 2, 3, 4])->vander(3);

echo "m\n$m";

The above example will output:

m
[[1   1   1 ]
 [4   2   1 ]
 [9   3   1 ]
 [16  4   1 ]]


use SciPhp\NumPhp as np;

$m = np::ar([1, 2, 3])->vander(5);

echo "m\n$m";

The above example will output:

m
[[1   1   1   1   1 ]
 [16  8   4   2   1 ]
 [81  27  9   3   1 ]]