On 3/15/13 1:21 PM, Becksfort, Jared wrote:
>
> -----Original Message-----
> From: Becksfort, Jared
> Sent: Monday, March 11, 2013 12:28 PM
> To: Commons Developers List
> Subject: RE: [math] Scaling arrays. .
>
> On 3/11/13 8:21 AM, Becksfort, Jared wrote:
>> Hi Phil,
>>
>>> What exactly *is* it and what are the use cases?
>> Just a method to multiply each element in an array by a number and return
>> either a copy of the array or do it in place. Maybe there can be one method
>> for either way:
>>
>> public static double[] scale(double val, final double[] arr) {
>> double[] newArr = new double[arr.length];
>> for (int i = 0; i < arr.length; i++) {
>> newArr[i] = arr[i] * val;
>> }
>> return newArr;
>> }
>>
>> public static void scaleInPlace(double val, final double[] arr) {
>> for (int i = 0; i < arr.length; i++) {
>> arr[i] *= val;
>> }
>> }
>>
>>> ...use cases
>> I imagine they are pretty varied. These methods could be used any time you
>> want to multiply all elements in an array by a number without writing a loop
>> each time. I am using this in some optimization code that I am submitting
>> but figured it would be broadly applicable enough to just be put in the
>> MathArrays class.
>>
>> Jared
>>
>> -----Original Message-----
>> From: Phil Steitz [mailto:[email protected]]
>> Sent: Sunday, March 10, 2013 2:19 PM
>> To: Commons Developers List
>> Subject: Re: [math] Scaling arrays. .
>>
>> On 3/8/13 12:14 PM, Becksfort, Jared wrote:
>>> Hello,
>>>
>>> I may be missing it somewhere, but I am surprised there is no function for
>>> scaling arrays in MathArrays.java or somewhere else.
>>>
>>> - Am I stupidly missing it?
>> Probably not. Closest thing is probably normalize in MathArrays.
>>> - Is there a reason it is not in there?
>> Probably no; though you will find that most vector / array algebraic
>> operations are implemented on the objects in the linear package, rather than
>> directly on double[]s.
>>> - Shall I add it?
>> +1 to add this
>> Created an issue and submitted patches for MathArrays.java and
>> MathArraysTest.java
>> https://issues.apache.org/jira/browse/MATH-946
>> Jared
>> Phil
>> What exactly *is* it and what are the use cases?
>>
>> Phil
>>> Thanks,
>>> Jared
> Hello,
>
> Does anyone know if these changes might be committed to the repository? Some
> upcoming changes I am submitting for another issue rely on it. It is not too
> much trouble for me to remove the dependencies, but if this is going in then
> I may as well use it.
>
> https://issues.apache.org/jira/browse/MATH-946
Patches just applied. Many thanks. One small thing that will make
it easier in the future is to create patches from the top-level
/trunk directory. Thanks!
Phil
>
> Thanks,
> Jared
>
>
>
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