deformula.zeroinf {deformula} | R Documentation |
Numerical quadrature of functions of one variable over [0, infinity) with the double exponential formula.
deformula.zeroinf(f, ..., zero.eps = 1.0e-12, rel.tol = 1.0e-8, start.divisions = 8, max.iter = 12)
f |
an R function taking a numeric first argument. |
... |
additional arguments to be passed to âfâ. |
zero.eps |
a threshold value to be zero. |
rel.tol |
relative accuracy requested. |
start.divisions |
the initial number of subintervals. |
max.iter |
an integer for the maximum number of iterations to increase subintervals. |
returns a list with components;
value |
an value for integral. |
x |
a vector of subintervals. |
w |
a vector of weights. |
t |
a vector of subintervals for trapezoid integral. |
h |
a value of subinterval. |
message |
OK or a string for the error message. |
f <- function(x, a) exp(-a*x) deformula.zeroinf(f, a=0.1)