com.graphbuilder.math.func.LogFunction Maven / Gradle / Ivy

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This OSGi bundle wraps poi, poi-ooxml, and poi-scratchpad ${pkgVersion} jar files.

There is a newer version: 5.2.3_1

/*
* Copyright (c) 2005, Graph Builder
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* * Neither the name of Graph Builder nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.

* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

package com.graphbuilder.math.func;

/**
The log function.
*/
public class LogFunction implements Function {

	public LogFunction() {}

	/**
	If the number of parameters specified is 1, then the log base 10 is taken of the
	value at index location 0.  If the number of parameters specified is 2, then the
	base value is at index location 1.
	*/
	public double of(double[] d, int numParam) {
		if (numParam == 1) {
			return java.lang.Math.log(d[0]) / java.lang.Math.log(10);
		}
		return java.lang.Math.log(d[0]) / java.lang.Math.log(d[1]);
	}

	/**
	Returns true only for 1 or 2 parameters, false otherwise.
	*/
	public boolean acceptNumParam(int numParam) {
		return numParam == 1 || numParam == 2;
	}

	public String toString() {
		return "log(x):log(x, y)";
	}
}