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Bibliographic Details
Main Author:	Marco Antonio Murray Lasso
Format:	Artículo científico
Language:	es
Published:	Universidad Nacional Autónoma de México 2005
Subjects:	Ingeniería Logo LISP programa lenguaje de programación inteligencia arti fi cial
Online Access:	https://www.redalyc.org/articulo.oa?id=40460303
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Sobre el uso de Logo en inteligencia artificial Marco Antonio Murray Lasso Ingeniería Logo LISP programa lenguaje de programación inteligencia arti fi cial Por ser un lenguaje derivado de LISP, el lenguaje Logo, no obstante de tener fama de serun lenguaje para niños, es un lenguaje adecuado para escribir programas de inteligenciaarti fi cial. El artículo se propone establecer lo ante rior. En vez de hacerlo escribiendo unproyecto real de inteligencia arti fi cial implementando en Logo, lo que llevaría a un artículomuy largo, se opta por tomar de la literatura de inteligencia arti fi cial un par de ejemploscortos elaborados en LISP, transcribirlos a Logo y hacer comparaciones entre losprogramas en ambos lenguajes. Se espera con esto resaltar la similitud entre Logo y LISP.Debido a la gran variedad de versiones de LISP existentes, y a que muchas versionestienen implementadas características foráneas al origen y filosofía del lenguaje, seescogió una versión pura de LISP para hacer la comparación. 2005 artículo científico 1405-7743 https://www.redalyc.org/articulo.oa?id=40460303 es http://www.redalyc.org/revista.oa?id=404 Ingeniería. Investigación y Tecnología application/pdf Universidad Nacional Autónoma de México Ingeniería. Investigación y Tecnología (México) Num.3 Vol.VI

if (filemtime($filename) + $maxlifetime < time()) { unlink($filename); $count++; } } return $count; } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ protected function saveSession($sessId, $data): bool { $sessFile = $this->path . '/sess_' . $sessId; if ($handle = fopen($sessFile, 'w')) { $return = false; // Lock the file for exclusive access to avoid issues with multiple // processes writing session simultaneously: if (flock($handle, LOCK_EX)) { $return = fwrite($handle, $data); // Make sure that there's no trailing data by truncating the file to // the correct length: ftruncate($handle, strlen($data)); fflush($handle); flock($handle, LOCK_UN); } fclose($handle); if ($return !== false) { return true; } } // If we got this far, something went wrong with the file output... // It is tempting to throw an exception here, but this code is called // outside of the context of exception handling, so all we can do is // echo a message.

// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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