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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
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package org.tensorics.core.function.lang;
import java.util.Comparator;
import org.tensorics.core.commons.operations.Conversion;
import org.tensorics.core.commons.options.Environment;
import org.tensorics.core.function.DiscreteFunction;
import org.tensorics.core.function.expressions.DiscreteFunctionToIterableExpression;
import org.tensorics.core.function.operations.CodomainExtraction;
import org.tensorics.core.iterable.lang.ScalarIterableExpressionSupport;
import org.tensorics.core.tree.domain.Expression;
/**
* Provides utility methods for acting on expressions of {@link DiscreteFunction}s from X to Y.
*
* The type of the values of the discrete function codomain is also the type of the values of the field.
*
* @author caguiler
* @param the type of the independent variable (input) of the discrete function
* @param the type of the dependent variable (output) of the discrete function and the type of the scalar values
* (elements of the field) on which to operate
*/
public class FunctionExpressionSupportWithConversionAndComparator extends ScalarIterableExpressionSupport {
private final Environment environment;
private final CodomainExtraction codomainExtraction;
private final Conversion conversion;
private final Comparator comparator;
FunctionExpressionSupportWithConversionAndComparator(Environment environment, Conversion conversion,
Comparator comparator) {
super(environment.field());
this.environment = environment;
this.conversion = conversion;
this.comparator = comparator;
codomainExtraction = new CodomainExtraction<>();
}
public final OngoingDeferredDiscreteFunctionBinaryOperation calculateF(
Expression> expression) {
return new OngoingDeferredDiscreteFunctionBinaryOperation<>(environment, expression, conversion, comparator);
}
public final Expression averageOfF(Expression> function) {
return averageOf(yValuesAsIterableExpression(function));
}
public final Expression rmsOfF(Expression> function) {
return rmsOf(yValuesAsIterableExpression(function));
}
public final Expression stdOfF(Expression> function) {
return stdOf(yValuesAsIterableExpression(function));
}
@SuppressWarnings("unchecked")
private Expression> yValuesAsIterableExpression(
Expression> function) {
return new DiscreteFunctionToIterableExpression<>(codomainExtraction,
(Expression>) function);
}
/**
* Only used by subclasses
*
* @return the {@link Environment} of this {@link FunctionSupportWithConversionAndComparator}
*/
protected Environment environment() {
return environment;
}
}