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/*
*
* * Copyright 2015 Skymind,Inc.
* *
* * 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.nd4j.linalg.util;
import org.apache.commons.math3.complex.Complex;
import org.apache.commons.math3.util.FastMath;
import org.nd4j.linalg.api.complex.IComplexDouble;
import org.nd4j.linalg.api.complex.IComplexFloat;
import org.nd4j.linalg.api.complex.IComplexNumber;
import org.nd4j.linalg.factory.Nd4j;
/**
* @author Adam Gibson
*/
public class ComplexUtil {
private ComplexUtil() {
}
/**
* Create complex number where the
* @param realComponents the real components for the complex
* @return the complex numbers based on the given real components
*/
public static IComplexNumber[][] complexNumbersFor(float[][] realComponents) {
IComplexNumber[][] ret = new IComplexNumber[realComponents.length][realComponents[0].length];
for(int i = 0; i < realComponents.length; i++)
for(int j = 0; j < realComponents[i].length; j++)
ret[i][j] = Nd4j.createComplexNumber(realComponents[i][j],0);
return ret;
}
/**
* Create complex number where the
* @param realComponents the real components for the complex
* @return the complex numbers based on the given real components
*/
public static IComplexNumber[][] complexNumbersFor(double[][] realComponents) {
IComplexNumber[][] ret = new IComplexNumber[realComponents.length][realComponents[0].length];
for(int i = 0; i < realComponents.length; i++)
for(int j = 0; j < realComponents[i].length; j++)
ret[i][j] = Nd4j.createComplexNumber(realComponents[i][j],0);
return ret;
}
/**
* Create complex number where the
* @param realComponents the real components for the complex
* @return the complex numbers based on the given real components
*/
public static IComplexNumber[] complexNumbersFor(float[] realComponents) {
IComplexNumber[] ret = new IComplexNumber[realComponents.length];
for(int i = 0; i < realComponents.length; i++)
ret[i] = Nd4j.createComplexNumber(realComponents[i],0);
return ret;
}
/**
* Create complex number where the
* @param realComponents the real components for the complex
* @return the complex numbers based on the given real components
*/
public static IComplexNumber[] complexNumbersFor(double[] realComponents) {
IComplexNumber[] ret = new IComplexNumber[realComponents.length];
for(int i = 0; i < realComponents.length; i++)
ret[i] = Nd4j.createComplexNumber(realComponents[i],0);
return ret;
}
/**
* Return the sin value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber atan(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).atan();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the sin value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber acos(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).acos();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the sin value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber asin(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).asin();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the sin value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber sin(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).sin();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the ceiling value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber ceil(IComplexNumber num) {
Complex c = new Complex(FastMath.ceil(num.realComponent().doubleValue()), FastMath.ceil(num.imaginaryComponent().doubleValue()));
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the floor value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber floor(IComplexNumber num) {
Complex c = new Complex(FastMath.floor(num.realComponent().doubleValue()), FastMath.floor(num.imaginaryComponent().doubleValue()));
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the log value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber neg(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).negate();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the log value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber log(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).log();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the absolute value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber sqrt(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).sqrt();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the absolute value of the given complex number
*
* @param num the number to getScalar the absolute value for
* @return the absolute value of this complex number
*/
public static IComplexNumber abs(IComplexNumber num) {
double c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).abs();
return Nd4j.createDouble(c, 0);
}
public static IComplexNumber round(IComplexNumber num) {
return Nd4j.createDouble(Math.round(num.realComponent().doubleValue()), Math.round(num.imaginaryComponent().doubleValue()));
}
/**
* Raise a complex number to a power
*
* @param num the number to raise
* @param power the power to raise to
* @return the number raised to a power
*/
public static IComplexNumber pow(IComplexNumber num, IComplexNumber power) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).pow(new Complex(power.realComponent().doubleValue(), power.imaginaryComponent().doubleValue()));
if (c.isNaN())
c = new Complex(Nd4j.EPS_THRESHOLD, 0.0);
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Raise a complex number to a power
*
* @param num the number to raise
* @param power the power to raise to
* @return the number raised to a power
*/
public static IComplexNumber pow(IComplexNumber num, double power) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).pow(power);
if (c.isNaN())
c = new Complex(Nd4j.EPS_THRESHOLD, 0.0);
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the cos of a complex number
*
* @param num the tanh of a complex number
* @return the tanh of a complex number
*/
public static IComplexNumber cos(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).cos();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the tanh of a complex number
*
* @param num the tanh of a complex number
* @return the tanh of a complex number
*/
public static IComplexNumber hardTanh(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).tanh();
if (c.getReal() < -1.0)
c = new Complex(-1.0, c.getImaginary());
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Return the tanh of a complex number
*
* @param num the tanh of a complex number
* @return the tanh of a complex number
*/
public static IComplexNumber tanh(IComplexNumber num) {
Complex c = new Complex(num.realComponent().doubleValue(), num.imaginaryComponent().doubleValue()).tanh();
return Nd4j.createDouble(c.getReal(), c.getImaginary());
}
/**
* Returns the exp of a complex number:
* Let r be the realComponent component and i be the imaginary
* Let ret be the complex number returned
* ret -> exp(r) * cos(i), exp(r) * sin(i)
* where the first number is the realComponent component
* and the second number is the imaginary component
*
* @param d the number to getFromOrigin the exp of
* @return the exponential of this complex number
*/
public static IComplexNumber exp(IComplexNumber d) {
if (d instanceof IComplexFloat)
return exp((IComplexFloat) d);
return exp((IComplexDouble) d);
}
/**
* Returns the exp of a complex number:
* Let r be the realComponent component and i be the imaginary
* Let ret be the complex number returned
* ret -> exp(r) * cos(i), exp(r) * sin(i)
* where the first number is the realComponent component
* and the second number is the imaginary component
*
* @param d the number to getFromOrigin the exp of
* @return the exponential of this complex number
*/
public static IComplexDouble exp(IComplexDouble d) {
return Nd4j.createDouble(FastMath.exp(d.realComponent()) * FastMath.cos(d.imaginaryComponent()), FastMath.exp(d.realComponent()) * FastMath.sin(d.imaginaryComponent()));
}
/**
* Returns the exp of a complex number:
* Let r be the realComponent component and i be the imaginary
* Let ret be the complex number returned
* ret -> exp(r) * cos(i), exp(r) * sin(i)
* where the first number is the realComponent component
* and the second number is the imaginary component
*
* @param d the number to getFromOrigin the exp of
* @return the exponential of this complex number
*/
public static IComplexFloat exp(IComplexFloat d) {
return Nd4j.createFloat((float) FastMath.exp(d.realComponent()) * (float) FastMath.cos(d.imaginaryComponent()), (float) FastMath.exp(d.realComponent()) * (float) FastMath.sin(d.imaginaryComponent()));
}
}
