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?
What exactly *is* it and what are the use cases?
Phil
>
> Thanks,
> Jared
>
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