Venkatesha Murthy TS created MATH-1130:
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Summary: A new set of functions to copyof, remove and replace for
a slice of array
Key: MATH-1130
URL: https://issues.apache.org/jira/browse/MATH-1130
Project: Commons Math
Issue Type: New Feature
Affects Versions: 3.4
Reporter: Venkatesha Murthy TS
These are utility functions mostly required as part of MathArrays.
MathArrays:
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The requirement is as follows:
a) double[] copyOf(double[] values, int begin, int length) ;
Similar to most other functions that support slice defined by the array part
from [begin, begin+length) ;its a requirement to copy a slice which is not
available (the closest is copyOf(array, int len) which misses out the begin
index)
b) double[] removeAll(double[] values, int begin, int length, double removable);
Need a function to remove a value from array and return the filtered version
which again must support slice.
c) double[] replaceAll(double[] values, int begin, int length, double oldValue,
double newValue);
Need a function to replace inplace an oldValue substituted with newValue and
return the original array with replaced values.
MathUtils
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boolean canEqual(double d1, double d2) ;
provide a canEqual function that is slightly better than exisitng
MathUtils.equals. We could also improve existing equals method however.
So the change here is that the new enhanced canEqual can do a quick check on
Nans and as well as both +ve and -ve Infinities faster and then move to a
detailed Double.compare(..) method. This avoids the Double.compare call for
infinities and NaN with faster reference equal check (i.e == ).
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