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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace SciPhp\NumPhp; |
| 6 | |
| 7 | use SciPhp\Exception\Message; |
| 8 | use SciPhp\NdArray; |
| 9 | use Webmozart\Assert\Assert; |
| 10 | |
| 11 | trait NumArrayTrait |
| 12 | { |
| 13 | /** |
| 14 | * Creates a NdArray with zero as default value |
| 15 | * |
| 16 | * @link http://sciphp.org/numphp.zeros |
| 17 | * Documentation for zeros() |
| 18 | * |
| 19 | * @api |
| 20 | */ |
| 21 | final public static function zeros(): NdArray |
| 22 | { |
| 23 | return self::full( |
| 24 | static::parseArgs(func_get_args()), 0 |
| 25 | ); |
| 26 | } |
| 27 | |
| 28 | /** |
| 29 | * Creates a NdArray with one as default value |
| 30 | * |
| 31 | * @link http://sciphp.org/numphp.ones |
| 32 | * Documentation for ones() |
| 33 | * |
| 34 | * @api |
| 35 | */ |
| 36 | final public static function ones(): NdArray |
| 37 | { |
| 38 | return self::full( |
| 39 | static::parseArgs(func_get_args()), 1 |
| 40 | ); |
| 41 | } |
| 42 | |
| 43 | /** |
| 44 | * Creates a NdArray with null as default value |
| 45 | * 'empty' can not be used in PHP |
| 46 | * |
| 47 | * @link http://sciphp.org/numphp.nulls |
| 48 | * Documentation for nulls() |
| 49 | * |
| 50 | * @api |
| 51 | */ |
| 52 | final public static function nulls(): NdArray |
| 53 | { |
| 54 | return self::full( |
| 55 | static::parseArgs(func_get_args()), null |
| 56 | ); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * Creates a NdArray with a default value |
| 61 | * |
| 62 | * @param array $shape |
| 63 | * @param mixed $value |
| 64 | * |
| 65 | * @link http://sciphp.org/numphp.full |
| 66 | * Documentation for full() |
| 67 | * |
| 68 | * @api |
| 69 | */ |
| 70 | final public static function full(array $shape, $value): NdArray |
| 71 | { |
| 72 | Assert::allInteger($shape); |
| 73 | Assert::allGreaterThan($shape, 0); |
| 74 | |
| 75 | return static::ar( |
| 76 | self::createArray($shape, $value) |
| 77 | ); |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Construct a n-dim array with a default value |
| 82 | * |
| 83 | * @param array $params |
| 84 | * @param mixed $value |
| 85 | * @return mixed|array |
| 86 | */ |
| 87 | final protected static function createArray(array $params, $value) |
| 88 | { |
| 89 | return isset($params[0]) |
| 90 | ? array_fill( |
| 91 | 0, |
| 92 | array_shift($params), |
| 93 | self::createArray($params, $value) |
| 94 | ) : $value; |
| 95 | } |
| 96 | |
| 97 | /** |
| 98 | * Construct a new array of nulls with the same shape and type |
| 99 | * as a given array. |
| 100 | * |
| 101 | * @param array|\SciPhp\NdArray $matrix |
| 102 | * |
| 103 | * @link http://sciphp.org/numphp.nulls_like |
| 104 | * Documentation for nulls_like() |
| 105 | * |
| 106 | * @api |
| 107 | */ |
| 108 | final public static function nulls_like($matrix): NdArray |
| 109 | { |
| 110 | return self::full_like($matrix, null); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Construct a new array of zeros with the same shape and type |
| 115 | * as a given array. |
| 116 | * |
| 117 | * @param array|\SciPhp\NdArray $matrix |
| 118 | * |
| 119 | * @link http://sciphp.org/numphp.zeros_like |
| 120 | * Documentation for zeros_like() |
| 121 | * |
| 122 | * @api |
| 123 | */ |
| 124 | final public static function zeros_like($matrix): NdArray |
| 125 | { |
| 126 | return self::full_like($matrix, 0); |
| 127 | } |
| 128 | |
| 129 | /** |
| 130 | * Construct a new array of ones with the same shape and type |
| 131 | * as a given array. |
| 132 | * |
| 133 | * @param array|\SciPhp\NdArray $matrix |
| 134 | * |
| 135 | * @link http://sciphp.org/numphp.ones_like |
| 136 | * Documentation for ones_like() |
| 137 | * |
| 138 | * @api |
| 139 | */ |
| 140 | final public static function ones_like($matrix): NdArray |
| 141 | { |
| 142 | return self::full_like($matrix, 1); |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * Construct a new array with the same shape and type as a given array, |
| 147 | * filled with a given value |
| 148 | * |
| 149 | * @param array|\SciPhp\NdArray $matrix |
| 150 | * |
| 151 | * @link http://sciphp.org/numphp.full_like |
| 152 | * Documentation for full_like() |
| 153 | * |
| 154 | * @api |
| 155 | */ |
| 156 | final public static function full_like($matrix, $value = null): NdArray |
| 157 | { |
| 158 | if (\is_array($matrix)) { |
| 159 | $matrix = static::ar($matrix); |
| 160 | } |
| 161 | |
| 162 | Assert::isInstanceOf($matrix, '\SciPhp\NdArray'); |
| 163 | |
| 164 | return self::full($matrix->shape, $value); |
| 165 | } |
| 166 | |
| 167 | /** |
| 168 | * Broadcast an array to a new shape. |
| 169 | * |
| 170 | * @param array|\SciPhp\NdArray $matrix |
| 171 | * @param array $shape |
| 172 | * |
| 173 | * @link http://sciphp.org/numphp.broadcast_to |
| 174 | * Documentation for broadcast_to() |
| 175 | * |
| 176 | * @since 0.3.0 |
| 177 | * @api |
| 178 | */ |
| 179 | final public static function broadcast_to($matrix, array $shape): NdArray |
| 180 | { |
| 181 | static::transform($matrix, true); |
| 182 | |
| 183 | // Is broadcast allowed? |
| 184 | self::can_broadcast_to($matrix, $shape); |
| 185 | |
| 186 | // 1 dim -> 2 dim |
| 187 | if ($matrix->ndim === 1) { |
| 188 | return $matrix->resize($shape); |
| 189 | } |
| 190 | |
| 191 | $m = self::zeros($shape); |
| 192 | |
| 193 | $row = 0; |
| 194 | $func = static function ($value) use (&$m, &$row): void { |
| 195 | $m["{$row}, :"] = $value; |
| 196 | $row++; |
| 197 | }; |
| 198 | |
| 199 | $matrix->walk_recursive($func); |
| 200 | |
| 201 | return $m; |
| 202 | } |
| 203 | |
| 204 | /** |
| 205 | * Checks that an array can be broadcast to a given shape |
| 206 | * |
| 207 | * @param NdArray $m |
| 208 | * @param array $shape |
| 209 | * @throws \InvalidArgumentException when broadcast cannot be done |
| 210 | */ |
| 211 | private static function can_broadcast_to(NdArray $m, array $shape): void |
| 212 | { |
| 213 | if (count($shape) > 2) { |
| 214 | throw new \InvalidArgumentException( |
| 215 | Message::ARRAYS_BROADCAST_NDIM2_ONLY |
| 216 | ); |
| 217 | } |
| 218 | |
| 219 | if ($m->ndim > 2) { |
| 220 | throw new \InvalidArgumentException( |
| 221 | Message::ARRAYS_BROADCAST_NDIM2_ONLY |
| 222 | ); |
| 223 | } |
| 224 | |
| 225 | $shape_m = $m->shape; |
| 226 | $m_index = $m->ndim; |
| 227 | |
| 228 | $countShape = count($shape) - 1; |
| 229 | for ($i = $countShape; $i >= 0; $i--) { |
| 230 | $m_index--; |
| 231 | if (! isset($shape_m[$m_index])) { |
| 232 | continue; |
| 233 | } |
| 234 | if ($shape[$i] === $shape_m[$m_index]) { |
| 235 | continue; |
| 236 | } |
| 237 | if ($shape_m[$m_index] === 1) { |
| 238 | continue; |
| 239 | } |
| 240 | |
| 241 | $message = sprintf( |
| 242 | Message::ARRAYS_BROADCAST_IMPOSSIBLE, |
| 243 | trim(strval(static::ar($m->shape))), |
| 244 | trim(strval(static::ar($shape))) |
| 245 | ); |
| 246 | |
| 247 | throw new \InvalidArgumentException($message); |
| 248 | } |
| 249 | } |
| 250 | } |