iwfm.logtrans

iwfm.logtrans(q, zero_offset=-2.0, neg_val=1e-09, roundoff=4)

Log-transform a number, accounting for non-zero and negative values.

Parameters:

• q (float) – value to be log-transformed

• zero_offset (float, default=-2.0) – value to return if q == 0

• neg_val (float, default=1e-9) – value to return if q < 0

• roundoff (int, default=4) – decimal places to round result

• Returns –

  • the log-transformed value for positive q

  • neg_val for negative q, or

  • zero_offset for q == 0