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A fast and easy to use dense and sparse matrix linear algebra library written in Java.
/*
* Copyright (c) 2009-2018, Peter Abeles. All Rights Reserved.
*
* This file is part of Efficient Java Matrix Library (EJML).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.ejml.equation;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* Centralized place to create new instances of operations and functions. Must call
* {@link #setManagerTemp} before any other functions.
*
* @author Peter Abeles
*/
public class ManagerFunctions {
// List of functions which take in N inputs
Map input1 = new HashMap<>();
Map inputN = new HashMap<>();
// Reference to temporary variable manager
protected ManagerTempVariables managerTemp;
public ManagerFunctions() {
addBuiltIn();
}
/**
* Returns true if the string matches the name of a function
*/
public boolean isFunctionName( String s ) {
if( input1.containsKey(s))
return true;
if( inputN.containsKey(s))
return true;
return false;
}
/**
* Create a new instance of single input functions
* @param name function name
* @param var0 Input variable
* @return Resulting operation
*/
public Operation.Info create( String name , Variable var0 ) {
Input1 func = input1.get(name);
if( func == null )
return null;
return func.create(var0,managerTemp);
}
/**
* Create a new instance of single input functions
* @param name function name
* @param vars Input variables
* @return Resulting operation
*/
public Operation.Info create( String name , List vars ) {
InputN func = inputN.get(name);
if( func == null )
return null;
return func.create(vars,managerTemp);
}
/**
* Create a new instance of a single input function from an operator character
* @param op Which operation
* @param input Input variable
* @return Resulting operation
*/
public Operation.Info create( char op , Variable input ) {
switch( op ) {
case '\'':
return Operation.transpose(input, managerTemp);
default:
throw new RuntimeException("Unknown operation " + op);
}
}
/**
* Create a new instance of a two input function from an operator character
* @param op Which operation
* @param left Input variable on left
* @param right Input variable on right
* @return Resulting operation
*/
public Operation.Info create( Symbol op , Variable left , Variable right ) {
switch( op ) {
case PLUS:
return Operation.add(left, right, managerTemp);
case MINUS:
return Operation.subtract(left, right, managerTemp);
case TIMES:
return Operation.multiply(left, right, managerTemp);
case RDIVIDE:
return Operation.divide(left, right, managerTemp);
case LDIVIDE:
return Operation.divide(right, left, managerTemp);
case POWER:
return Operation.pow(left, right, managerTemp);
case ELEMENT_DIVIDE:
return Operation.elementDivision(left, right, managerTemp);
case ELEMENT_TIMES:
return Operation.elementMult(left, right, managerTemp);
case ELEMENT_POWER:
return Operation.elementPow(left, right, managerTemp);
default:
throw new RuntimeException("Unknown operation " + op);
}
}
/**
*
* @param managerTemp
*/
public void setManagerTemp(ManagerTempVariables managerTemp) {
this.managerTemp = managerTemp;
}
/**
* Adds a function, with a single input, to the list
* @param name Name of function
* @param function Function factory
*/
public void add1(String name , Input1 function ) {
input1.put(name, function);
}
/**
* Adds a function, with a two inputs, to the list
* @param name Name of function
* @param function Function factory
*/
public void addN(String name , InputN function ) {
inputN.put(name,function);
}
/**
* Adds built in functions
*/
private void addBuiltIn( ) {
input1.put("inv", Operation::inv);
input1.put("pinv", Operation::pinv);
input1.put("rref", Operation::rref);
input1.put("eye", Operation::eye);
input1.put("det", Operation::det);
input1.put("normF", Operation::normF);
input1.put("sum", Operation::sum_one);
input1.put("trace", Operation::trace);
input1.put("diag", Operation::diag);
input1.put("min", Operation::min);
input1.put("max", Operation::max);
input1.put("abs", Operation::abs);
input1.put("sin", Operation::sin);
input1.put("cos", Operation::cos);
input1.put("atan", Operation::atan);
input1.put("exp", Operation::exp);
input1.put("log", Operation::log);
input1.put("sqrt", Operation::sqrt);
input1.put("rng", Operation::rng);
inputN.put("normP", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.normP(inputs.get(0), inputs.get(1), manager);
});
inputN.put("max", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("One or two inputs expected");
return Operation.max_two(inputs.get(0), inputs.get(1), manager);
});
inputN.put("min", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("One or two inputs expected");
return Operation.min_two(inputs.get(0), inputs.get(1), manager);
});
inputN.put("sum", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("One or two inputs expected");
return Operation.sum_two(inputs.get(0), inputs.get(1), manager);
});
inputN.put("zeros", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.zeros(inputs.get(0), inputs.get(1), manager);
});
inputN.put("ones", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.ones(inputs.get(0), inputs.get(1), manager);
});
inputN.put("rand", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.rand(inputs.get(0), inputs.get(1), manager);
});
inputN.put("randn", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.randn(inputs.get(0), inputs.get(1), manager);
});
inputN.put("kron", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.kron(inputs.get(0), inputs.get(1), manager);
});
inputN.put("dot", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.dot(inputs.get(0), inputs.get(1), manager);
});
inputN.put("pow", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.pow(inputs.get(0), inputs.get(1), manager);
});
inputN.put("atan2", (inputs, manager) -> {
if (inputs.size() != 2) throw new RuntimeException("Two inputs expected");
return Operation.atan2(inputs.get(0), inputs.get(1), manager);
});
inputN.put("solve", (inputs, manager) -> {
if( inputs.size() != 2 ) throw new RuntimeException("Two inputs expected");
return Operation.solve(inputs.get(0), inputs.get(1), manager);
});
inputN.put("extract", Operation::extract);
inputN.put("extractScalar", (inputs, manager) -> {
if( inputs.size() != 2 && inputs.size() != 3 ) throw new RuntimeException("Two or three inputs expected");
return Operation.extractScalar(inputs, manager);
});
}
public ManagerTempVariables getManagerTemp() {
return managerTemp;
}
/**
* Creates new instances of functions from a single variable
*/
public static interface Input1 {
Operation.Info create(Variable A, ManagerTempVariables manager);
}
/**
* Creates a new instance of functions from two variables
*/
public static interface InputN {
Operation.Info create(List inputs, ManagerTempVariables manager);
}
}