darkhistory.utilities.log_1_plus_x¶
- darkhistory.utilities.log_1_plus_x(x)¶
Computes log(1+x) with greater floating point accuracy.
Unlike
scipy.special.log1p, this can takefloat128. However the performance is certainly slower. See [1]_ for details. If that trick does not work, the code reverts to a Taylor expansion.- Parameters:
- xfloat or ndarray
The input value.
- Returns:
- ndarray
log(1+x).