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матрицы
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<!DOCTYPE html> | |
<html lang="en"> | |
<head> | |
<meta charset="UTF-8"> | |
<title>Лабораторная работа№ 2</title> | |
</head> | |
<body> | |
<head>Свойства отношения матрицы nxn</head> | |
<form action="" method="post"> | |
Матрица отношения: <textarea rows="6" name="mat"></textarea> | |
<br> | |
<input type="submit" name="sub" value="показать свойства"> | |
</form> | |
<?php | |
ini_set('display_errors', 'Off'); | |
if (isset($_POST['sub'])) { | |
$ind = 0; | |
$str = explode("\n", htmlspecialchars($_POST ['mat'])); | |
$n = count($str); | |
for ($i = 0; $i < $n; $i++) { | |
$el[$i] = explode(' ', $str[$i]); | |
} | |
for ($i = 0; $i < $n; $i++) { | |
} | |
for ($i = 0; $i < $n; $i++) { | |
if ($el[$i][$i] == 0) { | |
$ind = 1; | |
break; | |
} | |
} | |
if ($ind) { | |
echo 'Нерефлексивна'; | |
} else { | |
echo 'Рефлексивна'; | |
} | |
echo '<br>'; | |
$ind = 0; | |
for ($i = 0; $i < $n; $i++) { | |
for ($j = 0; $j < $n; $j++) { | |
if ($el[$i][$j] != $el[$j][$i]) { | |
$ind = 1; | |
break; | |
} | |
} | |
} | |
if ($ind) { | |
echo 'Acимметрична'; | |
} else { | |
echo 'Cимметрична'; | |
} | |
$ind = 0; | |
echo '<br>'; | |
$temp = 0; | |
$el1 = array(); | |
for ($i = 0; $i < $n; $i++) { | |
for ($j = 0; $j < $n; $j++) { | |
$el1[$i][$j] = 0; | |
} | |
} | |
for ($i = 0; $i < $n; $i++) { | |
for ($j = 0; $j < $n; $j++) { | |
for ($s = 0; $s < $n; $s++) { | |
$el1[$i][$j] = $temp + ($el[$s][$i] * $el[$j][$s]); | |
$temp = $el1[$i][$j]; | |
} | |
$temp = 0; | |
} | |
} | |
$ind = 0; | |
for ($i = 0; $i < $n; $i++) { | |
for ($j = 0; $j < $n; $j++) { | |
if ($el[$i][$j] != $el1[$i][$j]) { | |
$ind = 1; | |
break; | |
} | |
} | |
} | |
if ($ind) { | |
echo 'Нетранзитивна'; | |
} else 'Транзитивна'; | |
} | |
?> | |
</body> | |
</html> |
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