Examples of Functions

cern.jet.math.Functions

ld yield 1.4399560356056456 in all cases double a = 0.5; double b = 0.2; double v = Math.sin(a) + Math.pow(Math.cos(b),2); System.out.println(v); Functions F = Functions.functions; DoubleDoubleFunction f = F.chain(F.plus,F.sin,F.chain(F.square,F.cos)); System.out.println(f.apply(a,b)); DoubleDoubleFunction g = new DoubleDoubleFunction() { public double apply(double a, double b) { return Math.sin(a) + Math.pow(Math.cos(b),2); } }; System.out.println(g.apply(a,b));

Performance

Surprise. Using modern non-adaptive JITs such as SunJDK 1.2.2 (java -classic) there seems to be no or only moderate performance penalty in using function objects in a loop over traditional code in a loop. For complex nested function objects (e.g. F.chain(F.abs,F.chain(F.plus,F.sin,F.chain(F.square,F.cos)))) the penalty is zero, for trivial functions (e.g. F.plus) the penalty is often acceptable.

Iteration Performance [million function evaluations per second] Pentium Pro 200 Mhz, SunJDK 1.2.2, NT, java -classic,
	30000000 iterations		3000000 iterations (10 times less)
	`F.plus`	`a+b`	`F.chain(F.abs,F.chain(F.plus,F.sin,F.chain(F.square,F.cos)))`	`Math.abs(Math.sin(a) + Math.pow(Math.cos(b),2))`
	10.8	29.6	0.43	0.35

@author wolfgang.hoschek@cern.ch @version 1.0, 09/24/99

de.bananaco.permissions.commands.Functions
io.crate.metadata.Functions
lib.util.Functions
org.apache.commons.jxpath.Functions
A group of Function objects sharing a common namespace or a set of common namespaces. Use the classes {@link ClassFunctions ClassFunctions} and {@link PackageFunctions PackageFunctions}to register extension functions implemented as Java methods. @author Dmitri Plotnikov @version $Revision: 1.5 $ $Date: 2003/03/11 00:59:12 $
org.apache.shindig.expressions.Functions
An implementation of FunctionMapper that uses annotated static methods on classes to implement EL functions.
Each class passed to the constructor will have EL functions added for any static method annotated with the @Expose annotation. Each method can be exposed in one namespace prefix, with any number of method names.
The default Guice instance of the Functions class has the {@link OpensocialFunctions} methods registered.
org.drools.spi.Functions
Function Rule. @see org.drools.rule.RuleSet @author bob mcwhirter

org.opengis.filter.capability.Functions

Supported functions in a capabilities document.

 <xsd:complexType name="FunctionsType"> <xsd:sequence> <xsd:element name="FunctionNames" type="ogc:FunctionNamesType"/> </xsd:sequence> </xsd:complexType>

@author Justin Deoliveira, The Open Planning Project @source $URL$

org.openhab.binding.heatmiser.internal.thermostat.HeatmiserThermostat.Functions

Examples of org.opengis.filter.capability.Functions

    public void testParse() throws Exception {
        Element element = FilterMockData.element(document, document,
                new QName(OGC.NAMESPACE, "Functions"));
        FilterMockData.functionNames(document, element);


        Functions functions = (Functions) parse(OGC.FunctionsType);
        assertEquals(2, functions.getFunctionNames().size());
    }

View Full Code Here

Examples of org.opengis.filter.capability.Functions

        Functions functions = (Functions) parse(OGC.FunctionsType);
        assertEquals(2, functions.getFunctionNames().size());
    }


    public void testEncode() throws Exception {
        Functions functions = FilterMockData.functions();
        Document dom = encode(functions, new QName(OGC.NAMESPACE, "Functions"), OGC.FunctionsType);


        assertEquals(1, dom.getElementsByTagNameNS(OGC.NAMESPACE, "Function_Names").getLength());
        assertEquals(2, dom.getElementsByTagNameNS(OGC.NAMESPACE, "Function_Name").getLength());
    }

View Full Code Here

Examples of org.opengis.filter.capability.Functions

        if( scalar == null ) return false;        
        
        ArithmeticOperators operators = scalar.getArithmeticOperators();
        if( operators == null ) return false;
        
        Functions functions = operators.getFunctions();
        if( functions == null ) return false;
        
        // Note that only function name is checked here
        FunctionName found = functions.getFunctionName( function.getName() );
        // And that's enough to assess if the function is supported
        return found != null; 
    }

View Full Code Here

Examples of org.opengis.filter.capability.Functions

        if( scalar == null ) return false;        
        
        ArithmeticOperators operators = scalar.getArithmeticOperators();
        if( operators == null ) return false;
        
        Functions functions = operators.getFunctions();
        if( functions == null ) return false;
        
        // Note that only function name is checked here
        FunctionName found = functions.getFunctionName( function.getName() );
        // And that's enough to assess if the function is supported
        return found != null;
    }

View Full Code Here

Examples of org.openhab.binding.heatmiser.internal.thermostat.HeatmiserThermostat.Functions

      return;
    }
    logger.debug("Heatmiser command provider is: {}", providerCmd);
    
    int address = providerCmd.getAddress(itemName);
    Functions function = providerCmd.getFunction(itemName);
    
    for (HeatmiserThermostat thermostat: thermostatTable) {
      if(thermostat.getAddress() == address) {
        logger.debug("Heatmiser command found thermostat: {}", thermostat);
        // Found the thermostat

View Full Code Here

0 1 2 3 4

TOP

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.