math equations (with latex)

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trashbox
Registered User
Posts: 53
Joined: Wed Aug 22, 2007 9:25 pm

Re: math equations (with latex)

Post by trashbox » Wed Jul 02, 2008 4:50 pm

Stevem, this is the information:

Code: Select all

About to run /usr/bin/dvips -E 924505aa3c603ee6171c9d1bee846f21.dvi -o 924505aa3c603ee6171c9d1bee846f21.ps 
sh: /usr/bin/dvips: Permission denied
[phpBB Debug] PHP Notice: in file /class.latexrender.php on line 313: copy(924505aa3c603ee6171c9d1bee846f21.png) [function.copy]: failed to open stream: No such file or directory
[Unparseable or potentially dangerous latex formula. Error 6 ]

I was suspecting that because I tried run this command yesterday:

Code: Select all

/usr/bin/dvips teste.dvi -o teste.ps
in the same directory /latexrender/tmp with this test file, and I got the "permission denied" message from the Linux prompt too.
Equipe AjudaMatemática.com
Exercícios, plantão de dúvidas, desafios, problemas curiosos e repositório de materiais IME-USP do curso de licenciatura em Matemática!
Writing mathematical symbols with LaTeX and BBCode (just a bridge):
http://www.ajudamatematica.com/viewtopi ... p=177#p177

stevem
Registered User
Posts: 398
Joined: Sun Aug 25, 2002 1:59 pm

Re: math equations (with latex)

Post by stevem » Wed Jul 02, 2008 5:31 pm

At least we know now where the problem lies.
trashbox wrote:sh: /usr/bin/dvips: Permission denied
Check that the permissions and ownership of dvips is the same as those for the other binary files in /usr/bin.
If you, as root, try running

Code: Select all

dvips -v
from the command line and get the same error, then something has gone wrong with dvips itself.

trashbox
Registered User
Posts: 53
Joined: Wed Aug 22, 2007 9:25 pm

Re: math equations (with latex)

Post by trashbox » Wed Jul 02, 2008 8:34 pm

I don't have root access, but with my own login I get this same error.
I've already an opened ticket in the server provider about this "suddenly" permission denied. I have to wait.

Stevem, thank you helping me to point the problem.
I'll remember that debug php code.
Equipe AjudaMatemática.com
Exercícios, plantão de dúvidas, desafios, problemas curiosos e repositório de materiais IME-USP do curso de licenciatura em Matemática!
Writing mathematical symbols with LaTeX and BBCode (just a bridge):
http://www.ajudamatematica.com/viewtopi ... p=177#p177

CodeHunter
Registered User
Posts: 3
Joined: Sun Jun 29, 2008 11:25 pm

Re: math equations (with latex)

Post by CodeHunter » Wed Jul 02, 2008 11:26 pm

Hi stevem, i have looked through all the posts. You are doing a great job since five years ago! Good job stevem.

I will really appreciate it if you can answer several questions for me,

1. I tried to following the instruction to install the latexrender mod on the server. But I don't understand some part of it. My downloaded version is latex_render 0.81 at http://www2.hawaii.edu/~aerickso/ following the link on the offcial website http://www.mayer.dial.pipex.com/tex.htm. In the instruction. It is instructed that I shall find in /includes/bbcode.php

Code: Select all

#-----[ FIND ]---------------------------------------------
#
# near line 195
#
// Patterns and replacements for URL and email tags..
$patterns = array();
$replacements = array();

#-----[ FIND ]---------------------------------------------
#
# near line 285
#
// [img]image_url_here[/img] code..
$text = preg_replace("#\[img\]((http|ftp|https|ftps)://)([^ \?&=\#\"\n\r\t<]*?(\.(jpg|jpeg|gif|png)))\[/img\]#sie", "'[img:$uid]\\1' . str_replace(' ', '%20', '\\3') . '[/img:$uid]'", $text);

but I can't find anything in my bbcode.php,

Code: Select all

<?php
/**
*
* @package phpBB3
* @version $Id: bbcode.php 8479 2008-03-29 00:22:48Z naderman $
* @copyright (c) 2005 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/

/**
* @ignore
*/
if (!defined('IN_PHPBB'))
{
	exit;
}

/**
* BBCode class
* @package phpBB3
*/
class bbcode
{
	var $bbcode_uid = '';
	var $bbcode_bitfield = '';
	var $bbcode_cache = array();
	var $bbcode_template = array();

	var $bbcodes = array();

	var $template_bitfield;
	var $template_filename = '';

	/**
	* Constructor
	* Init bbcode cache entries if bitfield is specified
	*/
	function bbcode($bitfield = '')
	{
		if ($bitfield)
		{
			$this->bbcode_bitfield = $bitfield;
			$this->bbcode_cache_init();
		}
	}

	/**
	* Second pass bbcodes
	*/
	function bbcode_second_pass(&$message, $bbcode_uid = '', $bbcode_bitfield = false)
	{
		if ($bbcode_uid)
		{
			$this->bbcode_uid = $bbcode_uid;
		}

		if ($bbcode_bitfield !== false)
		{
			$this->bbcode_bitfield = $bbcode_bitfield;

			// Init those added with a new bbcode_bitfield (already stored codes will not get parsed again)
			$this->bbcode_cache_init();
		}

		if (!$this->bbcode_bitfield)
		{
			// Remove the uid from tags that have not been transformed into HTML
			if ($this->bbcode_uid)
			{
				$message = str_replace(':' . $this->bbcode_uid, '', $message);
			}

			return;
		}

		$str = array('search' => array(), 'replace' => array());
		$preg = array('search' => array(), 'replace' => array());

		$bitfield = new bitfield($this->bbcode_bitfield);
		$bbcodes_set = $bitfield->get_all_set();

		$undid_bbcode_specialchars = false;
		foreach ($bbcodes_set as $bbcode_id)
		{
			if (!empty($this->bbcode_cache[$bbcode_id]))
			{
				foreach ($this->bbcode_cache[$bbcode_id] as $type => $array)
				{
					foreach ($array as $search => $replace)
					{
						${$type}['search'][] = str_replace('$uid', $this->bbcode_uid, $search);
						${$type}['replace'][] = $replace;
					}

					if (sizeof($str['search']))
					{
						$message = str_replace($str['search'], $str['replace'], $message);
						$str = array('search' => array(), 'replace' => array());
					}

					if (sizeof($preg['search']))
					{
						// we need to turn the entities back into their original form to allow the
						// search patterns to work properly
						if (!$undid_bbcode_specialchars)
						{
							$message = str_replace(array('&#58;', '&#46;'), array(':', '.'), $message);
							$undid_bbcode_specialchars = true;
						}

						$message = preg_replace($preg['search'], $preg['replace'], $message);
						$preg = array('search' => array(), 'replace' => array());
					}
				}
			}
		}

		// Remove the uid from tags that have not been transformed into HTML
		$message = str_replace(':' . $this->bbcode_uid, '', $message);
	}

	/**
	* Init bbcode cache
	*
	* requires: $this->bbcode_bitfield
	* sets: $this->bbcode_cache with bbcode templates needed for bbcode_bitfield
	*/
	function bbcode_cache_init()
	{
		global $user, $phpbb_root_path;

		if (empty($this->template_filename))
		{
			$this->template_bitfield = new bitfield($user->theme['bbcode_bitfield']);
			$this->template_filename = $phpbb_root_path . 'styles/' . $user->theme['template_path'] . '/template/bbcode.html';

			if (!@file_exists($this->template_filename))
			{
				trigger_error('The file ' . $this->template_filename . ' is missing.', E_USER_ERROR);
			}
		}

		$bbcode_ids = $rowset = $sql = array();

		$bitfield = new bitfield($this->bbcode_bitfield);
		$bbcodes_set = $bitfield->get_all_set();

		foreach ($bbcodes_set as $bbcode_id)
		{
			if (isset($this->bbcode_cache[$bbcode_id]))
			{
				// do not try to re-cache it if it's already in
				continue;
			}
			$bbcode_ids[] = $bbcode_id;

			if ($bbcode_id > NUM_CORE_BBCODES)
			{
				$sql[] = $bbcode_id;
			}
		}

		if (sizeof($sql))
		{
			global $db;

			$sql = 'SELECT *
				FROM ' . BBCODES_TABLE . '
				WHERE ' . $db->sql_in_set('bbcode_id', $sql);
			$result = $db->sql_query($sql, 3600);

			while ($row = $db->sql_fetchrow($result))
			{
				// To circumvent replacing newlines with <br /> for the generated html,
				// we use carriage returns here. They are later changed back to newlines
				$row['bbcode_tpl'] = str_replace("\n", "\r", $row['bbcode_tpl']);
				$row['second_pass_replace'] = str_replace("\n", "\r", $row['second_pass_replace']);

				$rowset[$row['bbcode_id']] = $row;
			}
			$db->sql_freeresult($result);
		}

		foreach ($bbcode_ids as $bbcode_id)
		{
			switch ($bbcode_id)
			{
				case 0:
					$this->bbcode_cache[$bbcode_id] = array(
						'str' => array(
							'[/quote:$uid]'	=> $this->bbcode_tpl('quote_close', $bbcode_id)
						),
						'preg' => array(
							'#\[quote(?:="(.*?)")?:$uid\]((?!\[quote(?:=".*?")?:$uid\]).)?#ise'	=> "\$this->bbcode_second_pass_quote('\$1', '\$2')"
						)
					);
				break;

				case 1:
					$this->bbcode_cache[$bbcode_id] = array(
						'str' => array(
							'[b:$uid]'	=> $this->bbcode_tpl('b_open', $bbcode_id),
							'[/b:$uid]'	=> $this->bbcode_tpl('b_close', $bbcode_id),
						)
					);
				break;

				case 2:
					$this->bbcode_cache[$bbcode_id] = array(
						'str' => array(
							'[i:$uid]'	=> $this->bbcode_tpl('i_open', $bbcode_id),
							'[/i:$uid]'	=> $this->bbcode_tpl('i_close', $bbcode_id),
						)
					);
				break;

				case 3:
					$this->bbcode_cache[$bbcode_id] = array(
						'preg' => array(
							'#\[url:$uid\]((.*?))\[/url:$uid\]#s'			=> $this->bbcode_tpl('url', $bbcode_id),
							'#\[url=([^\[]+?):$uid\](.*?)\[/url:$uid\]#s'	=> $this->bbcode_tpl('url', $bbcode_id),
						)
					);
				break;

				case 4:
					if ($user->optionget('viewimg'))
					{
						$this->bbcode_cache[$bbcode_id] = array(
							'preg' => array(
								'#\[img:$uid\](.*?)\[/img:$uid\]#s'		=> $this->bbcode_tpl('img', $bbcode_id),
							)
						);
					}
					else
					{
						$this->bbcode_cache[$bbcode_id] = array(
							'preg' => array(
								'#\[img:$uid\](.*?)\[/img:$uid\]#s'		=> str_replace('$2', '[ img ]', $this->bbcode_tpl('url', $bbcode_id, true)),
							)
						);
					}
				break;

				case 5:
					$this->bbcode_cache[$bbcode_id] = array(
						'preg' => array(
							'#\[size=([\-\+]?\d+):$uid\](.*?)\[/size:$uid\]#s'	=> $this->bbcode_tpl('size', $bbcode_id),
						)
					);
				break;

				case 6:
					$this->bbcode_cache[$bbcode_id] = array(
						'preg' => array(
							'!\[color=(#[0-9a-f]{6}|[a-z\-]+):$uid\](.*?)\[/color:$uid\]!is'	=> $this->bbcode_tpl('color', $bbcode_id),
						)
					);
				break;

				case 7:
					$this->bbcode_cache[$bbcode_id] = array(
						'str' => array(
							'[u:$uid]'	=> $this->bbcode_tpl('u_open', $bbcode_id),
							'[/u:$uid]'	=> $this->bbcode_tpl('u_close', $bbcode_id),
						)
					);
				break;

				case 8:
					$this->bbcode_cache[$bbcode_id] = array(
						'preg' => array(
							'#\[code(?:=([a-z]+))?:$uid\](.*?)\[/code:$uid\]#ise'	=> "\$this->bbcode_second_pass_code('\$1', '\$2')",
						)
					);
				break;

				case 9:
					$this->bbcode_cache[$bbcode_id] = array(
						'preg' => array(
							'#(\[\/?(list|\*):[mou]?:?$uid\])[\n]{1}#'	=> "\$1",
							'#(\[list=([^\[]+):$uid\])[\n]{1}#'			=> "\$1",
							'#\[list=([^\[]+):$uid\]#e'					=> "\$this->bbcode_list('\$1')",
						),
						'str' => array(
							'[list:$uid]'		=> $this->bbcode_tpl('ulist_open_default', $bbcode_id),
							'[/list:u:$uid]'	=> $this->bbcode_tpl('ulist_close', $bbcode_id),
							'[/list:o:$uid]'	=> $this->bbcode_tpl('olist_close', $bbcode_id),
							'[*:$uid]'			=> $this->bbcode_tpl('listitem', $bbcode_id),
							'[/*:$uid]'			=> $this->bbcode_tpl('listitem_close', $bbcode_id),
							'[/*:m:$uid]'		=> $this->bbcode_tpl('listitem_close', $bbcode_id)
						),
					);
				break;

				case 10:
					$this->bbcode_cache[$bbcode_id] = array(
						'preg' => array(
							'#\[email:$uid\]((.*?))\[/email:$uid\]#is'			=> $this->bbcode_tpl('email', $bbcode_id),
							'#\[email=([^\[]+):$uid\](.*?)\[/email:$uid\]#is'	=> $this->bbcode_tpl('email', $bbcode_id)
						)
					);
				break;

				case 11:
					if ($user->optionget('viewflash'))
					{
						$this->bbcode_cache[$bbcode_id] = array(
							'preg' => array(
								'#\[flash=([0-9]+),([0-9]+):$uid\](.*?)\[/flash:$uid\]#'	=> $this->bbcode_tpl('flash', $bbcode_id),
							)
						);
					}
					else
					{
						$this->bbcode_cache[$bbcode_id] = array(
							'preg' => array(
								'#\[flash=([0-9]+),([0-9]+):$uid\](.*?)\[/flash:$uid\]#'	=> str_replace('$1', '$3', str_replace('$2', '[ flash ]', $this->bbcode_tpl('url', $bbcode_id, true)))
							)
						);
					}
				break;

				case 12:
					$this->bbcode_cache[$bbcode_id] = array(
						'str'	=> array(
							'[/attachment:$uid]'	=> $this->bbcode_tpl('inline_attachment_close', $bbcode_id)
						),
						'preg'	=> array(
							'#\[attachment=([0-9]+):$uid\]#'	=> $this->bbcode_tpl('inline_attachment_open', $bbcode_id)
						)
					);
				break;

				default:
					if (isset($rowset[$bbcode_id]))
					{
						if ($this->template_bitfield->get($bbcode_id))
						{
							// The bbcode requires a custom template to be loaded
							if (!$bbcode_tpl = $this->bbcode_tpl($rowset[$bbcode_id]['bbcode_tag'], $bbcode_id))
							{
								// For some reason, the required template seems not to be available, use the default template
								$bbcode_tpl = (!empty($rowset[$bbcode_id]['second_pass_replace'])) ? $rowset[$bbcode_id]['second_pass_replace'] : $rowset[$bbcode_id]['bbcode_tpl'];
							}
							else
							{
								// In order to use templates with custom bbcodes we need
								// to replace all {VARS} to corresponding backreferences
								// Note that backreferences are numbered from bbcode_match
								if (preg_match_all('/\{(URL|LOCAL_URL|EMAIL|TEXT|SIMPLETEXT|IDENTIFIER|COLOR|NUMBER)[0-9]*\}/', $rowset[$bbcode_id]['bbcode_match'], $m))
								{
									foreach ($m[0] as $i => $tok)
									{
										$bbcode_tpl = str_replace($tok, '$' . ($i + 1), $bbcode_tpl);
									}
								}
							}
						}
						else
						{
							// Default template
							$bbcode_tpl = (!empty($rowset[$bbcode_id]['second_pass_replace'])) ? $rowset[$bbcode_id]['second_pass_replace'] : $rowset[$bbcode_id]['bbcode_tpl'];
						}

						// Replace {L_*} lang strings
						$bbcode_tpl = preg_replace('/{L_([A-Z_]+)}/e', "(!empty(\$user->lang['\$1'])) ? \$user->lang['\$1'] : ucwords(strtolower(str_replace('_', ' ', '\$1')))", $bbcode_tpl);

						if (!empty($rowset[$bbcode_id]['second_pass_replace']))
						{
							// The custom BBCode requires second-pass pattern replacements
							$this->bbcode_cache[$bbcode_id] = array(
								'preg' => array($rowset[$bbcode_id]['second_pass_match'] => $bbcode_tpl)
							);
						}
						else
						{
							$this->bbcode_cache[$bbcode_id] = array(
								'str' => array($rowset[$bbcode_id]['second_pass_match'] => $bbcode_tpl)
							);
						}
					}
					else
					{
						$this->bbcode_cache[$bbcode_id] = false;
					}
				break;
			}
		}
	}

	/**
	* Return bbcode template
	*/
	function bbcode_tpl($tpl_name, $bbcode_id = -1, $skip_bitfield_check = false)
	{
		static $bbcode_hardtpl = array();
		if (empty($bbcode_hardtpl))
		{
			global $user;
			
			$bbcode_hardtpl = array(
				'b_open'	=> '<span style="font-weight: bold">',
				'b_close'	=> '</span>',
				'i_open'	=> '<span style="font-style: italic">',
				'i_close'	=> '</span>',
				'u_open'	=> '<span style="text-decoration: underline">',
				'u_close'	=> '</span>',
				'img'		=> '<img src="$1" alt="' . $user->lang['IMAGE'] . '" />',
				'size'		=> '<span style="font-size: $1%; line-height: normal">$2</span>',
				'color'		=> '<span style="color: $1">$2</span>',
				'email'		=> '<a href="mailto:$1">$2</a>'
			);
		}

		if ($bbcode_id != -1 && !$skip_bitfield_check && !$this->template_bitfield->get($bbcode_id))
		{
			return (isset($bbcode_hardtpl[$tpl_name])) ? $bbcode_hardtpl[$tpl_name] : false;
		}

		if (empty($this->bbcode_template))
		{
			if (($tpl = file_get_contents($this->template_filename)) === false)
			{
				trigger_error('Could not load bbcode template', E_USER_ERROR);
			}

			// replace \ with \\ and then ' with \'.
			$tpl = str_replace('\\', '\\\\', $tpl);
			$tpl = str_replace("'", "\'", $tpl);

			// strip newlines and indent
			$tpl = preg_replace("/\n[\n\r\s\t]*/", '', $tpl);

			// Turn template blocks into PHP assignment statements for the values of $bbcode_tpl..
			$this->bbcode_template = array();

			$matches = preg_match_all('#<!-- BEGIN (.*?) -->(.*?)<!-- END (?:.*?) -->#', $tpl, $match);

			for ($i = 0; $i < $matches; $i++)
			{
				if (empty($match[1][$i]))
				{
					continue;
				}

				$this->bbcode_template[$match[1][$i]] = $this->bbcode_tpl_replace($match[1][$i], $match[2][$i]);
			}
		}

		return (isset($this->bbcode_template[$tpl_name])) ? $this->bbcode_template[$tpl_name] : ((isset($bbcode_hardtpl[$tpl_name])) ? $bbcode_hardtpl[$tpl_name] : false);
	}

	/**
	* Return bbcode template replacement
	*/
	function bbcode_tpl_replace($tpl_name, $tpl)
	{
		global $user;

		static $replacements = array(
			'quote_username_open'	=> array('{USERNAME}'	=> '$1'),
			'color'					=> array('{COLOR}'		=> '$1', '{TEXT}'			=> '$2'),
			'size'					=> array('{SIZE}'		=> '$1', '{TEXT}'			=> '$2'),
			'img'					=> array('{URL}'		=> '$1'),
			'flash'					=> array('{WIDTH}'		=> '$1', '{HEIGHT}'			=> '$2', '{URL}'	=> '$3'),
			'url'					=> array('{URL}'		=> '$1', '{DESCRIPTION}'	=> '$2'),
			'email'					=> array('{EMAIL}'		=> '$1', '{DESCRIPTION}'	=> '$2')
		);

		$tpl = preg_replace('/{L_([A-Z_]+)}/e', "(!empty(\$user->lang['\$1'])) ? \$user->lang['\$1'] : ucwords(strtolower(str_replace('_', ' ', '\$1')))", $tpl);

		if (!empty($replacements[$tpl_name]))
		{
			$tpl = strtr($tpl, $replacements[$tpl_name]);
		}

		return trim($tpl);
	}

	/**
	* Second parse list bbcode
	*/
	function bbcode_list($type)
	{
		if ($type == '')
		{
			$tpl = 'ulist_open_default';
			$type = 'default';
		}
		else if ($type == 'i')
		{
			$tpl = 'olist_open';
			$type = 'lower-roman';
		}
		else if ($type == 'I')
		{
			$tpl = 'olist_open';
			$type = 'upper-roman';
		}
		else if (preg_match('#^(disc|circle|square)$#i', $type))
		{
			$tpl = 'ulist_open';
			$type = strtolower($type);
		}
		else if (preg_match('#^[a-z]$#', $type))
		{
			$tpl = 'olist_open';
			$type = 'lower-alpha';
		}
		else if (preg_match('#[A-Z]#', $type))
		{
			$tpl = 'olist_open';
			$type = 'upper-alpha';
		}
		else if (is_numeric($type))
		{
			$tpl = 'olist_open';
			$type = 'arabic-numbers';
		}
		else
		{
			$tpl = 'olist_open';
			$type = 'arabic-numbers';
		}

		return str_replace('{LIST_TYPE}', $type, $this->bbcode_tpl($tpl));
	}

	/**
	* Second parse quote tag
	*/
	function bbcode_second_pass_quote($username, $quote)
	{
		// when using the /e modifier, preg_replace slashes double-quotes but does not
		// seem to slash anything else
		$quote = str_replace('\"', '"', $quote);
		$username = str_replace('\"', '"', $username);

		// remove newline at the beginning
		if ($quote == "\n")
		{
			$quote = '';
		}

		$quote = (($username) ? str_replace('$1', $username, $this->bbcode_tpl('quote_username_open')) : $this->bbcode_tpl('quote_open')) . $quote;

		return $quote;
	}

	/**
	* Second parse code tag
	*/
	function bbcode_second_pass_code($type, $code)
	{
		// when using the /e modifier, preg_replace slashes double-quotes but does not
		// seem to slash anything else
		$code = str_replace('\"', '"', $code);

		switch ($type)
		{
			case 'php':
				// Not the english way, but valid because of hardcoded syntax highlighting
				if (strpos($code, '<span class="syntaxdefault"><br /></span>') === 0)
				{
					$code = substr($code, 41);
				}

			// no break;

			default:
				$code = str_replace("\t", '&nbsp; &nbsp;', $code);
				$code = str_replace('  ', '&nbsp; ', $code);
				$code = str_replace('  ', ' &nbsp;', $code);

				// remove newline at the beginning
				if (!empty($code) && $code[0] == "\n")
				{
					$code = substr($code, 1);
				}
			break;
		}

		$code = $this->bbcode_tpl('code_open') . $code . $this->bbcode_tpl('code_close');

		return $code;
	}
}

?>
My phpBB is version 3.01. Do you have any suggestion? By the way the instruction in the "readme" file included in phpbb folder of the general distribution http://www.mayer.dial.pipex.com/latexrender.zip seems different from the one that I use. It has fewer lines to edit. Is it okay that i use the latter one?

2. I am now using a shared server. So what should be my path in what follows?

$latexrender_path = "/home/domain_name/public_html/phpbb/latexrender";
$latexrender_path_http = "/phpbb/latexrender";


My server runs linux and I installed phpbb in the home root. The following is what I did, correct me if this is right,

$latexrender_path = "/home/mydomainname/public_html/latexrender";
$latexrender_path_http = "latexrender";

Thanks a lot!

stevem
Registered User
Posts: 398
Joined: Sun Aug 25, 2002 1:59 pm

Re: math equations (with latex)

Post by stevem » Thu Jul 03, 2008 9:17 am

1. A new forum was opened for phpBB3 and you'll find the instructions at
http://www.phpbb.com/community/viewtopi ... a#p3671325 numbers 4 to 8. You can then ignore the other readme.txt.

2. Your paths are almost correct. The readme.txt assumed that latexrender was installed in a subdirectory of phpbb, but latexrender can be installed anywhere. However, you must have a forward slash in the second path so you have
$latexrender_path_http = "/latexrender";

CodeHunter
Registered User
Posts: 3
Joined: Sun Jun 29, 2008 11:25 pm

Re: math equations (with latex)

Post by CodeHunter » Thu Jul 03, 2008 4:48 pm

Thanks so much stevem. I have the mod working on my forum now. Wish I could buy you a beer some time :D
One last question, I have solved the \prime problem (which was shown as something like 39). You also mentioned that the same approach applies to the other peculiar symbols such as &. But what's the corresponding code? Since [tex]&[\tex] cannot be displayed, I can't think of anything similar to &#39 as which representing '.
i.e., how to find the corresponding

Code: Select all

$latex_formula = str_replace("What's filled in here","I'm a peculiar character (e.g., &)",$latex_formula);
In the end, it seems I can't change the size of output by latex command such as \footnotesize or \huge, can I?

Thanks a lot!

stevem
Registered User
Posts: 398
Joined: Sun Aug 25, 2002 1:59 pm

Re: math equations (with latex)

Post by stevem » Thu Jul 03, 2008 5:13 pm

& has the code & See HTML Codes - Characters and symbols for more.

The formulae are in maths mode so you can only use the commands that work in maths mode, \displaystyle, \scriptstyle, \scriptscriptstyle amd \textstyle. See Math Mode page 39. You can of course change the font size of the whole document and if you use the extarticle class you get more sizes than the standard 10,11 and 12pt.

CodeHunter
Registered User
Posts: 3
Joined: Sun Jun 29, 2008 11:25 pm

Re: math equations (with latex)

Post by CodeHunter » Fri Jul 04, 2008 5:49 pm

Thank you very much again stevem. I can't be happier :D

trashbox
Registered User
Posts: 53
Joined: Wed Aug 22, 2007 9:25 pm

Re: math equations (with latex)

Post by trashbox » Mon Jul 07, 2008 1:14 pm

Stevem, they've solved the dvips' permission problem, it's working now, thanks for your help.
Equipe AjudaMatemática.com
Exercícios, plantão de dúvidas, desafios, problemas curiosos e repositório de materiais IME-USP do curso de licenciatura em Matemática!
Writing mathematical symbols with LaTeX and BBCode (just a bridge):
http://www.ajudamatematica.com/viewtopi ... p=177#p177

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