logSpace function

Array logSpace(num start, num stop, { num base = 10.0, int num = 50, bool endpoint = true, })

Return numbers spaced evenly on a log scale.

In linear space, the sequence starts at base^start (base to the power of start) and ends with base^stop (depending on endpoint flag).

Example:

var result = logSpace(1, 3, num: 3);
print(result); // Array([100.0, 215.443469, 464.158883])

The generated array will contain num elements if endpoint is true; otherwise, num minus 1 elements will be generated, leaving the last number out.

Example:

var result = logSpace(1, 3, num: 3, endpoint: false);
print(result); // Array([100.0, 215.443469])

Implementation

Array logSpace(
  num start,
  num stop, {
  num base = 10.0,
  int num = 50,
  bool endpoint = true,
}) {
  var result = Array.fixed(endpoint ? num : num - 1);
  var x = start;
  final increment = (stop - start) / (num - 1);

  for (var i = 0; i < result.length; i++) {
    result[i] = pow(base, x).toDouble();
    x += increment;
  }

  return result;
}