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	<help>
		<element name="DESCRIPTION" text="The extension Raster calculator allows the computation of algebraic expressions with raster layers, obtaining derived information in the form of new layers of geographical data.&#10;&#10;All the elements that maybe selected such as layers, functions, operators and constants will appear on the left hand part of the parameter window.&#10;&#10;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).&#10;&#10;The most common operators  appear on the  right side of the window." description="Description" type="0">
		</element>
		<element name="ADDITIONAL_INFO" text="" description="Additional information" type="0">
		</element>
		<element name="EXTENSION_AUTHOR" text="Victor Olaya" description="Extension 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="FORMULA" text='Notes on general syntax&#10;&#10;TO add a layer, just enter its name. In the case of multiband layers, you can use "Band" followed by band number. Example, "mde.asc Band 1".&#10;&#10;You can also use the "|" sign, example "image.tif|2".&#10;&#10;Functions:&#10;&#10;* sin(x): returns the sine of x (x should be within the radius).&#10;* cos(x): returns the  cosine of x (x should be within the radius).&#10;* tan(x): returns the  tangent of x (x should be within the radius).&#10;* asin(x): returns the archsine of  x (x should be within the radius).&#10;* acos(x): returns the archcosine of  x (x should be within the radius).&#10;* atan(x): returns the archcotangent de x (x should be within the radius).&#10;* atan2(x/y): returns the archcotangent of  x/y (x/y should be within the radius).&#10;* sinh(x): returns the  hyperbolic sine of x (x should be within the radius).&#10;* cosh(x): returns the hyperbolic cosine of x (x should be within the radius ).&#10;* atanh(x): returns the inverse hyperbolic  tangent  of x (x should be in the radius).&#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(): returns 1 if the expression inside the parenthesis is true, 0  otherwise.&#10;&#10;Operators. The  precedence of  operators is as usual : + and - are evaluated after · 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;* (multiplication)&#10;* / (division)&#10;*  % (percentage)&#10;* ! (NOT)&#10;*  ^ (elevated to)&#10;* &amp;&amp; (AND)&#10;* || (OR)&#10;* &lt; (less than)&#10;* &gt; (more than)&#10;* &lt;= (less or equal to)&#10;* &gt;= (more or equal to)&#10;*  == (iqual to)&#10;* != (different from)&#10;&#10;Constants. &#10;* Pi&#10;* Cell size[raster layer]&#10;* e' description="Formula" type="3">
		</element>
		<element name="OUTPUT_DESCRIPTION" text="" description="Description" type="2">
		</element>
		<element name="RESULT" text="New raster layer." description="Result" type="2">
		</element>
	</help>
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