computes with accuracy the natural logarithm of its argument added by one
y=log1p(x)
:x real scalar, vector or matrix : :y real scalar, vector or matrix :
log1p(x) is the “element-wise” log(1+x) function. y(i,j)=log(1 + x(i,j)). This function, defined for x > -1, must be used if we want to compute log(1+x) with accuracy for |x| << 1.
`format`_("e",24)
`log`_(1.001)
log1p(0.001)
`log`_(1 + 1.e-7)
log1p(1.e-7)
`log`_(1 + 1.e-20)
log1p(1.e-20)
`format`_("v") //reset default format