Search code examples
javaarraysperformancevectormultiplication

Most Efficient Way to Scale an Array in Java?

(Apologies if this has been asked before - I can't believe it hasn't, but I couldn't find one. Perhaps my search-fu is weak.)

For years I've "known" that Java has no native function to scale an array (i.e. multiply each element by a constant). So I've been doing this:

for (int i=0; i<array.length; i++) {
  array[i] = array[i] * scaleFactor;
}

Is this actually the most efficient way (in this application, for example, it's an array of around 10000 doubles)? Or is there a better way?

Solution

  • Looks absolutely fine to me. I can't think of a more efficient way. Obviously try to put that code in one place rather than having the actual code all over the place, but other than that, no obvious problems.