/*
* Copyright 1998-2009 University Corporation for Atmospheric Research/Unidata
*
* Portions of this software were developed by the Unidata Program at the
* University Corporation for Atmospheric Research.
*
* Access and use of this software shall impose the following obligations
* and understandings on the user. The user is granted the right, without
* any fee or cost, to use, copy, modify, alter, enhance and distribute
* this software, and any derivative works thereof, and its supporting
* documentation for any purpose whatsoever, provided that this entire
* notice appears in all copies of the software, derivative works and
* supporting documentation. Further, UCAR requests that the user credit
* UCAR/Unidata in any publications that result from the use of this
* software or in any product that includes this software. The names UCAR
* and/or Unidata, however, may not be used in any advertising or publicity
* to endorse or promote any products or commercial entity unless specific
* written permission is obtained from UCAR/Unidata. The user also
* understands that UCAR/Unidata is not obligated to provide the user with
* any support, consulting, training or assistance of any kind with regard
* to the use, operation and performance of this software nor to provide
* the user with any updates, revisions, new versions or "bug fixes."
*
* THIS SOFTWARE IS PROVIDED BY UCAR/UNIDATA "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 UCAR/UNIDATA BE LIABLE FOR ANY SPECIAL,
* INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE ACCESS, USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package ucar.nc2.util;
import java.util.Formatter;
/**
* Miscellaneous static routines.
*
* @author caron
*/
public class Misc {
private static boolean show = false;
//private static double maxAbsoluteError = 1.0e-6;
private static double maxReletiveError = 1.0e-6;
/* http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
public static boolean closeEnough( double v1, double v2) {
double d1 = Math.abs(v1-v2);
if (d1 < maxAbsoluteError) return true;
double diff = (Math.abs(v2) > Math.abs(v1)) ? Math.abs((v1-v2)/v2) : Math.abs((v1-v2)/v1);
return diff < maxReletiveError;
} */
/**
* Check if numbers are equal with tolerance
* @param v1 first floating point number
* @param v2 second floating point number
* @param tol reletive tolerence
* @return true if within tolerance
*/
public static boolean closeEnough( double v1, double v2, double tol) {
if (show) {
double d1 = Math.abs(v1-v2);
double d3 = Math.abs(v1/v2);
double d2 = Math.abs((v1/v2)-1);
System.out.println("v1= "+v1+" v2="+v2+" diff="+d1+" abs(v1/v2)="+d3+" abs(v1/v2-1)="+d2);
}
double diff = (v2 == 0.0) ? Math.abs(v1-v2) : Math.abs(v1/v2-1);
return diff < tol;
}
/**
* Check if numbers are equal with default tolerance
* @param v1 first floating point number
* @param v2 second floating point number
* @return true if within tolerance
*/
public static boolean closeEnough( double v1, double v2) {
if (v1 == v2) return true;
double diff = (v2 == 0.0) ? Math.abs(v1-v2) : Math.abs(v1/v2-1);
return diff < maxReletiveError;
}
/**
* Check if numbers are equal with default tolerance
* @param v1 first floating point number
* @param v2 second floating point number
* @return true if within tolerance
*/
public static boolean closeEnough( float v1, float v2) {
if (v1 == v2) return true;
double diff = (v2 == 0.0) ? Math.abs(v1-v2) : Math.abs(v1/v2-1);
return diff < maxReletiveError;
}
/** test */
public static void main(String args[]) {
long val1 = -1;
long val2 = 234872309;
int val3 = 2348;
int val4 = 32;
Formatter f = new Formatter(System.out);
f.format(" address dataPos offset size\n");
f.format(" %#-18x %#-18x %5d %4d%n", val1, val2, val3, val4);
}
static public String showBytes(byte[] buff) {
StringBuilder sbuff = new StringBuilder();
for (int i = 0; i < buff.length; i++) {
byte b = buff[i];
int ub = (b < 0) ? b + 256 : b;
if (i > 0) sbuff.append(" ");
sbuff.append(ub);
}
return sbuff.toString();
}
static public void showBytes(byte[] buff, Formatter f) {
for (int i = 0; i < buff.length; i++) {
byte b = buff[i];
int ub = (b < 0) ? b + 256 : b;
f.format("%3d ", ub);
}
}
}