Log10

java.lang.Object

org.eclipse.nebula.visualization.xygraph.util.Log10

public class Log10
extends java.lang.Object

Helper for log10-related computations.

Field Summary

Fields

Modifier and Type Field Description

(package private) static double HUGE_NEGATIVE
Constructor Summary

Constructors

Constructor Description

Log10()
Method Summary

Modifier and Type Method Description

static double log10(double val)
Adjusted log10 to handle values less or equal to zero.

static double pow10(double value)

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details
- HUGE_NEGATIVE
  
  static final double HUGE_NEGATIVE
  
  See Also:
  
  Constant Field Values
Constructor Details
- Log10
  
  public Log10()
Method Details
- log10
  
  public static double log10(double val)
  
  Adjusted log10 to handle values less or equal to zero.
  The logarithm does not result in real numbers for arguments less or equal to zero, but the plot should still somehow handle such values without crashing. So anything ≤ 0 is mapped to a 'really big negative' number just for the sake of plotting.
  Note that LogarithmicAxis.java in the JFreeChart has another interesting idea for modifying the log10 of values ≤ 10, resulting in a smooth plot for the full real argument range. Unfortunately that clobbers values like 1e-7, which might be a very real vacuum reading.
  
  Parameters:
  
  val - value for which log₁₀ should be calculated.
  
  Returns:
  
  an adjusted log₁₀(val).
- pow10
  
  public static double pow10(double value)
  
  Returns:
  
  pow(10, value)