integrate {stats}  R Documentation 
Adaptive quadrature of functions of one variable over a finite or infinite interval.
integrate(f, lower, upper, ..., subdivisions = 100L, rel.tol = .Machine$double.eps^0.25, abs.tol = rel.tol, stop.on.error = TRUE, keep.xy = FALSE, aux = NULL)
f 
an R function taking a numeric first argument and returning a numeric vector of the same length. Returning a nonfinite element will generate an error. 
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the limits of integration. Can be infinite. 
... 
additional arguments to be passed to 
subdivisions 
the maximum number of subintervals. 
rel.tol 
Swimsuit Secret Swimsuit Boutique Secret Boutique Top Victoria's Victoria's relative accuracy requested. 
abs.tol 
absolute accuracy requested. 
stop.on.error 
logical. If true (the default) an error stops the function. If false some errors will give a result with a warning in the 
keep.xy 
Boutique Top Swimsuit Secret Victoria's Boutique Secret Victoria's Swimsuit unused. For compatibility with S. 
aux 
Boutique Swimsuit Top Victoria's Boutique Swimsuit Secret Secret Victoria's unused. For compatibility with S. 
Note that arguments after ...
must be matched exactly.
If one or both limits are infinite, the infinite range is mapped onto a finite interval.
For a finite interval, globally adaptive interval subdivision is used in connection with extrapolation by Wynn's Epsilon algorithm, with the basic step being Gauss–Kronrod quadrature.
rel.tol
cannot be less than max(50*.Machine$double.eps, 0.5e28)
if abs.tol <= 0
.
In R versions <= 3.2.x, the first entries of lower
and upper
were used whereas an error is signalled now if they are not of length one.
A list of class Secret Boutique Victoria's Swimsuit Secret Top Victoria's Swimsuit Boutique "integrate"
with components
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the final estimate of the integral. 
abs.error 
Swimsuit Victoria's Top Boutique Boutique Swimsuit Secret Secret Victoria's estimate of the modulus of the absolute error. 
subdivisions 
the number of subintervals produced in the subdivision process. 
message 

call 
the matched call. 
Like all numerical integration routines, these evaluate the function on a finite set of points. If the function is approximately constant (in particular, zero) over nearly all its range it is possible that the result and error estimate may be seriously wrong.
When integrating over infinite intervals do so explicitly, rather than just using a large number as the endpoint. This increases the chance of a correct answer – any function whose integral over an infinite interval is finite must be near zero for most of that interval.
For values at a finite set of points to be a fair reflection of the behaviour of the function elsewhere, the function needs to be wellbehaved, for example differentiable except perhaps for a small number of jumps or integrable singularities.
Boutique Victoria's Victoria's Swimsuit Swimsuit Top Secret Boutique Secret f
must accept a vector of inputs and produce a vector of function evaluations at those points. The Piece Stylish Leaf Straps Plant Print Spaghetti Beach Swimwear One Style w8r6wq
function may be helpful to convert f
to this form.
Based on QUADPACK routines dqags
and dqagi
by R. Piessens and E. deDoncker–Kapenga, available from Netlib.
R. Piessens, E. deDoncker–Kapenga, C. Uberhuber, D. Kahaner (1983) Swimsuit Secret Swimsuit Boutique Victoria's Top Victoria's Boutique Secret Quadpack: a Subroutine Package for Automatic Integration; Springer Verlag.
Company Shorts Bright Boutique Beautiful amp; qwHfpaintegrate(dnorm, 1.96, 1.96) integrate(dnorm, Inf, Inf) ## a slowlyconvergent integral integrand < function(x) {1/((x+1)*sqrt(x))} integrate(integrand, lower = 0, upper = Inf) ## don't do this if you really want the integral from 0 to Inf integrate(integrand, lower = 0, upper = 10) integrate(integrand, lower = 0, upper = 100000) integrate(integrand, lower = 0, upper = 1000000, stop.on.error = FALSE) ## some functions do not handle vector input properly f < function(x) 2.0 try(integrate(f, 0, 1)) integrate(Vectorize(f), 0, 1) ## correct integrate(function(x) rep(2.0, length(x)), 0, 1) ## correct ## integrate can fail if misused integrate(dnorm, 0, 2) integrate(dnorm, 0, 20) integrate(dnorm, 0, 200) integrate(dnorm, 0, 2000) integrate(dnorm, 0, 20000) ## fails on many systems integrate(dnorm, 0, Inf) ## works integrate(dnorm, 0:1, 20) #> error! ## "silently" gave integrate(dnorm, 0, 20) in earlier versions of R