P-Lingua format - Revision history

Ignacio at 10:12, 4 April 2010

2010-04-04T10:12:31Z

←Older revision		Revision as of 10:12, 4 April 2010
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-	under construction...	+	still under construction...

Ignacio: Replacing page with 'under construction...'

2010-04-04T10:12:22Z

Replacing page with 'under construction...'

←Older revision		Revision as of 10:12, 4 April 2010
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-	~~== Valid identifiers ==~~	+	under construction...
-	~~We say that a sequence of characters forms a ''valid identifier'' if it does not begin with a numeric character and it is composed by characters from the~~	+
-	~~following:~~	+
-		+
-	~~a b c d e f g h i j k l m n o p q r s t u v w x y z~~	+
-	~~A B C D E F G H I J K L M N O P Q R S T U V W X Y Z~~	+
-	~~0 1 2 3 4 5 6 7 8 9 _~~	+
-		+
-	~~Valid identifiers are widely used in the language: to define module names, parameters, indexes, membrane labels, alphabet objects and strings~~.	+
-		+
-	~~The following text strings are reserved words in the language: ''def, call, @mu, @ms, @model, @lambda, @d, let, @inf, @debug, main, -->, #'' and they cannot be used as valid identifiers~~.	+
-		+
-	~~== Variables ==~~	+
-	~~Four kind of variables are permitted in P-Lingua:~~	+
-		+
-	* [[#Global variables definition \| Global variables]]	+
-	* [[#Local variables definition \| Local variables]]	+
-	* [[#Indexes and parameters \| Indexes]]	+
-	* [[#Indexes and parameters \| Parameters]]	+
-		+
-	~~Variables are used to store numeric values and their names are valid identifiers. We use 64 bits (signed) in double precision.~~	+
-		+
-	~~===Global variables definition===~~	+
-	Global variables must be declared out of any program module and they can be accessed from all of the program modules (see [[#Modules definition \| modules definition]]). The name of a global variable '''global_variable_name''' must be a valid identifier. The syntax to define a global variable is the following:	+
-		+
-	~~global_variable_name = numeric_expression;~~	+
-		+
-	~~=== Local variables definition ===~~	+
-		+
-	~~Local variables can only be accessed from the module in which they were declared and they must only be defined inside module definitions. The name of~~	+
-	~~a local variable '''local_variable_name''' must be a valid identifier. The syntax to define a local variable is the following:~~	+
-		+
-	~~let local_variable_name = numeric_expression;~~	+
-		+
-	~~=== Indexes and parameters ===~~	+
-		+
-	~~Indexes and parameters can be consider local variables used in [[#Parametric sentences \| parametric sentences]] and [[#Modules definition \| modules definition]] respectively.~~	+
-		+
-	~~== Identifiers for electrical charges ==~~	+
-		+
-	In P-Lingua, we can consider electrical charges by using the '''+''' and '''-''' symbols for positive and negative charges respectively, and no one for neutral charge. It is worth mentioning that polarizationless P systems are included.	+
-		+
-	~~== Membrane labels ==~~	+
-		+
-	There are three ways of writing membrane labels in P-Lingua: the first one is just a natural number; the second one is to denote the label as a valid identifier and the third one is by numeric expressions that represent natural numbers between brackets.	+
-		+
-	~~== Environment identifiers ==~~	+
-		+
-	For multienvironment P systems, there are three ways of writing environment identifiers in P-Lingua: the first one is just a natural number; the second one is to denote the label as a valid identifier and the third one is by numeric expressions that represent natural numbers between brackets.	+
-		+
-	~~== Numeric expressions ==~~	+
-		+
-	Numeric expressions can be written by using '''*''' (multiplication), '''/''' (division), '''%''' (module), '''+''' (addition), '''-''' (subtraction), '''^''' (potence), '''@floor''' (the next smaller integer), '''@ceil''' (the next largest integer) and '''@log''' (base 2 logarithm) operators with integer or real numbers and/or variables, along with the use of parentheses. It is possible to write numbers by using exponential notation.	+
-		+
-	~~Examples of numeric expressions:~~	+
-	* <m>$3*10^{-5}$</m> is written '''3e-5'''.	+
-	* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.	+
-	* <m>7\lceil log_2 x \rceil</m> is written '''7* (@ceil @log x)'''.	+
-		+
-		+
-	~~== Objects ==~~	+
-	The objects of the alphabet of a P system are written using valid identifiers, and the inclusion of sub-indexes is permitted by using brackets. For example, <m>$x_{i,2n+1}$</m> and ''Yes'' are written as '''x{i,2*n+1}''' and '''Yes''' respectively.	+
-		+
-	~~The multiplicity of an object is represented by using the '''''' operator. For example, <m>$x_i^{2n+1}$</m> is written as '''x{i}(2*n+1)'''~~.	+

Ignacio at 10:10, 4 April 2010

2010-04-04T10:10:28Z

←Older revision		Revision as of 10:10, 4 April 2010
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	* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.		* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.
	* <m>7\lceil log_2 x \rceil</m> is written '''7* (@ceil @log x)'''.		* <m>7\lceil log_2 x \rceil</m> is written '''7* (@ceil @log x)'''.
		+

	== Objects ==		== Objects ==

Ignacio at 10:10, 4 April 2010

2010-04-04T10:10:01Z

←Older revision		Revision as of 10:10, 4 April 2010
Line 59:		Line 59:

	== Objects ==		== Objects ==
-	The objects of the alphabet of a P system are written using valid identifiers, and the inclusion of sub-indexes is permitted by using brackets. For example, <m>$x_{i,2n+1}$</m> and ~~<m>~~Yes~~</m>~~ are written as '''x{i,2*n+1}''' and '''Yes''' respectively.	+	The objects of the alphabet of a P system are written using valid identifiers, and the inclusion of sub-indexes is permitted by using brackets. For example, <m>$x_{i,2n+1}$</m> and ''Yes'' are written as '''x{i,2*n+1}''' and '''Yes''' respectively.

	The multiplicity of an object is represented by using the '''''' operator. For example, <m>$x_i^{2n+1}$</m> is written as '''x{i}(2*n+1)'''.		The multiplicity of an object is represented by using the '''''' operator. For example, <m>$x_i^{2n+1}$</m> is written as '''x{i}(2*n+1)'''.

Ignacio at 10:09, 4 April 2010

2010-04-04T10:09:42Z

←Older revision		Revision as of 10:09, 4 April 2010
Line 59:		Line 59:

	== Objects ==		== Objects ==
-	The objects of the alphabet of a P system are written using valid identifiers, and the inclusion of sub-indexes is permitted by using brackets. For example, <m>$x_{i,2n+1}$</m> and <m>$Yes$</m> are written as '''x{i,2*n+1}''' and '''Yes''' respectively.	+	The objects of the alphabet of a P system are written using valid identifiers, and the inclusion of sub-indexes is permitted by using brackets. For example, <m>$x_{i,2n+1}$</m> and <m>Yes</m> are written as '''x{i,2*n+1}''' and '''Yes''' respectively.

	The multiplicity of an object is represented by using the '''''' operator. For example, <m>$x_i^{2n+1}$</m> is written as '''x{i}(2*n+1)'''.		The multiplicity of an object is represented by using the '''''' operator. For example, <m>$x_i^{2n+1}$</m> is written as '''x{i}(2*n+1)'''.

Ignacio at 10:08, 4 April 2010

2010-04-04T10:08:49Z

←Older revision		Revision as of 10:08, 4 April 2010
Line 57:		Line 57:
	* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.		* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.
	* <m>7\lceil log_2 x \rceil</m> is written '''7* (@ceil @log x)'''.		* <m>7\lceil log_2 x \rceil</m> is written '''7* (@ceil @log x)'''.
		+
		+	== Objects ==
		+	The objects of the alphabet of a P system are written using valid identifiers, and the inclusion of sub-indexes is permitted by using brackets. For example, <m>$x_{i,2n+1}$</m> and <m>$Yes$</m> are written as '''x{i,2*n+1}''' and '''Yes''' respectively.
		+
		+	The multiplicity of an object is represented by using the '''''' operator. For example, <m>$x_i^{2n+1}$</m> is written as '''x{i}(2*n+1)'''.

Ignacio: /* Numeric expressions */

2010-04-04T10:06:08Z

Numeric expressions

←Older revision		Revision as of 10:06, 4 April 2010
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	== Numeric expressions ==		== Numeric expressions ==

-	Numeric expressions can be written by using '''*''' (multiplication), '''/''' (division), '''%''' (module), '''+''' (addition), '''-''' (subtraction), '''^''' (potence), '''@floor''' (the next smaller integer), '''@ceil''' (the next largest integer) and @log (base 2 logarithm) operators with integer or	+	Numeric expressions can be written by using '''*''' (multiplication), '''/''' (division), '''%''' (module), '''+''' (addition), '''-''' (subtraction), '''^''' (potence), '''@floor''' (the next smaller integer), '''@ceil''' (the next largest integer) and '''@log''' (base 2 logarithm) operators with integer or real numbers and/or variables, along with the use of parentheses. It is possible to write numbers by using exponential notation.
-	real numbers and/or variables, along with the use of parentheses. It is possible to write numbers by using exponential notation.	+

	Examples of numeric expressions:		Examples of numeric expressions:

Ignacio: /* Numeric expressions */

2010-04-04T10:05:23Z

Numeric expressions

←Older revision		Revision as of 10:05, 4 April 2010
Line 57:		Line 57:
	* <m>$3*10^{-5}$</m> is written '''3e-5'''.		* <m>$3*10^{-5}$</m> is written '''3e-5'''.
	* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.		* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.
-	* <m>7\lceil log_2 x \rceil</m> is written '''7 (@ceil @log x)'''.	+	* <m>7\lceil log_2 x \rceil</m> is written '''7* (@ceil @log x)'''.

Ignacio: /* Numeric expressions */

2010-04-04T10:05:15Z

Numeric expressions

←Older revision		Revision as of 10:05, 4 April 2010
Line 57:		Line 57:
	* <m>$3*10^{-5}$</m> is written '''3e-5'''.		* <m>$3*10^{-5}$</m> is written '''3e-5'''.
	* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.		* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.
-	* <m>7*\lceil log_2 x \rceil</m> is written '''@ceil @log x'''.	+	* <m>7\lceil log_2 x \rceil</m> is written '''7 (@ceil @log x)'''.

Ignacio: /* Numeric expressions */

2010-04-04T10:04:47Z

Numeric expressions

←Older revision		Revision as of 10:04, 4 April 2010
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	Examples of numeric expressions:		Examples of numeric expressions:
	* <m>$3*10^{-5}$</m> is written '''3e-5'''.		* <m>$3*10^{-5}$</m> is written '''3e-5'''.
-	* <m>\frac{3^{4-x}+17)}{23}</m> is written '''(3^(4-x)+17)/23'''.	+	* <m>\frac{3^{4-x}+17}{23}</m> is written '''(3^(4-x)+17)/23'''.
		+	* <m>7*\lceil log_2 x \rceil</m> is written '''@ceil @log x'''.