Example usage for org.apache.commons.math3.transform TransformUtils scaleArray

Introduction

In this page you can find the example usage for org.apache.commons.math3.transform TransformUtils scaleArray.

Prototype

public static Complex[] scaleArray(Complex[] f, double d) 

Source Link

Document

Multiply every component in the given complex array by the given real number.

Usage

From source file:experiment.FastCosineTransformer_bug.java

/**
 * {@inheritDoc}//from   ww  w  .ja v  a2  s.  c o  m
 *
 * @throws MathIllegalArgumentException if the length of the data array is
 * not a power of two plus one
 */
public double[] transform(final double[] f, final TransformType type) throws MathIllegalArgumentException {
    if (type == TransformType.FORWARD) {
        if (normalization == DctNormalization.ORTHOGONAL_DCT_I) {
            final double s = FastMath.sqrt(2.0 / (f.length - 1));
            return TransformUtils.scaleArray(fct(f), s);
        }
        return fct(f);
    }
    final double s2 = 2.0 / (f.length - 1);
    final double s1;
    if (normalization == DctNormalization.ORTHOGONAL_DCT_I) {
        s1 = FastMath.sqrt(s2);
    } else {
        s1 = s2;
    }
    return TransformUtils.scaleArray(fct(f), s1);
}

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From source file:experiment.FastSineTransformer_bug.java

/**
 * {@inheritDoc}//  w w  w  . ja  va 2s. c  o m
 *
 * The first element of the specified data set is required to be {@code 0}.
 *
 * @throws MathIllegalArgumentException if the length of the data array is
 *   not a power of two, or the first element of the data array is not zero
 */
public double[] transform(final double[] f, final TransformType type) {
    if (normalization == DstNormalization.ORTHOGONAL_DST_I) {
        final double s = FastMath.sqrt(2.0 / f.length);
        return TransformUtils.scaleArray(fst(f), s);
    }
    if (type == TransformType.FORWARD) {
        return fst(f);
    }
    final double s = 2.0 / f.length;
    return TransformUtils.scaleArray(fst(f), s);
}

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