<?xml version='1.0' encoding='ISO-8859-1' standalone='yes' ?>
	<help>
		<element name="DESCRIPTION" text="The field calculator allows the computation of algebraic expressions using values from the attributes table of a vector layers.  &#10;&#10;All the elements that may be selected such as fields, functions, operators and constants appear on the left hand side of the parameter window.  By double clicking an element, its value will be added to the Formula text box. Expressions can also be entered directly by typing the different formulas and values on the text box (see below for details about general syntax).  The most common operators appear on the right hand side of the window.&#10;" description="Description" type="0">
		</element>
		<element name="ADDITIONAL_INFO" text="" description="Additional information" type="0">
		</element>
		<element name="EXTENSION_AUTHOR" text="Victor Olaya" description="Algorithm created by" type="0">
		</element>
		<element name="HELP_AUTHOR" text="Victor Olaya" description="Help file created by" type="0">
		</element>
		<element name="USER_NOTES" text="" description="User notes" type="0">
		</element>
		<element name="LAYER" text="The vector layer to use. Values from its attributes tables can be used to define the algebraic expression to compute for each feature." description="Layer" type="3">
		</element>
		<element name="FORMULA" text="The formula to use to compute resulting values. &#10;&#10; Notes on general syntax:  &#10;&#10;To add a field, just enter its name.  &#10;&#10;Functions:  &#10;*sin(x): returns the sine of x (x should be in radians). &#10;*cos(x): returns the cosine of x (x should be in radians). &#10;*tan(x): returns the tangent of x (x should be in radians). &#10;*asin(x): returns the archsine of x (x should be in radians). &#10;*acos(x): returns the archcosine of x (x should be in radians). &#10;*atan(x): returns the archcotangent de x (x should be in radians). &#10;*atan2(x,y): returns the archcotangent of x/y (x/y should be in radians). &#10;*sinh(x): returns the hyperbolic sine of x (x should be in radians). &#10;*cosh(x): returns the hyperbolic cosine of x (x should be in radians). &#10;*atanh(x): returns the inverse hyperbolic tangent of x (x should be in radians). &#10;*In(x): returns the logarithm of x. &#10;*log(x): returns the base-10 logarithm. &#10;*exp(x): returns the exponential function of x. &#10;*abs(x): returns the absolute value of x. &#10;*rand(): returns a random value within the range 0-1. &#10;*mod(x,y): returns the module of x/y. &#10;*sqrt(x): returns the positive square root of x. &#10;*if(expression, a, b): returns a if  expression is true, b otherwise.  &#10;&#10;Operators. The precedence of operators is as usual : + and - are evaluated after &#183; y /, and these after the power operator. Use parenthesis in case of doubt, to be sure of how the program will evaluate the introduced formula. &#10;*+ (add) &#10;*- (subtract) &#10;*x(multiplication) &#10;*/ (division) &#10;*% (modulus) &#10;*! (NOT) &#10;*^ (powero) &#10;*&amp;&amp; (AND) &#10;*|| (OR) &#10;*(less than) &#10;*&gt; (more than) &#10;*= (less or equal to) &#10;*&gt;= (more or equal to) &#10;*== (equal to) &#10;*!= (different from)  &#10;&#10;Constants. &#10;&#10;*Pi &#10;*e  &#10;&#10;If, for a given feature, a field used in the formula has an invlaid value, the resulting field will have a blank value." description="Formula" type="3">
		</element>
		<element name="OUTPUT_DESCRIPTION" text="" description="Description" type="2">
		</element>
		<element name="RESULT" text="The resulting layer. It is identical to the input layer, but it contains an additional field with the resulting value of applying the given formula using the values of each feature." description="Result" type="2">
		</element>
	</help>
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