log1p
Syntax
log1p(X)
Parameters
X is a scalar/vector/matrix/table.
Details
Returns log(1+X).
Note:
DolphinDB log1p and numpy.log1p provide the same core
functionality. The difference is that DolphinDB log1p accepts
only one parameter, X, whereas numpy.log1p supports
additional parameters such as out and where.
Examples
log1p(0);
// output: 0
log1p([0, e-1, pow(e,2)-1, pow(e,3)-1, NULL]);
// output: [0,1,2,3,]
log1p([0, e-1, pow(e,2)-1, pow(e,3)-1]$2:2);| #0 | #1 |
|---|---|
| 0 | 2 |
| 1 | 3 |