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+\name{powfunc}
+\alias{powfunc}
+\title{Power function}
+\description{
+  Arithmetic power function for modelling univariate nonlinear calibration data.
+}
+\usage{
+  powfunc(x,a,b)
+}
+\arguments{
+  \item{x}{
+    Independent variable}
+  \item{a}{
+    Coefficient}
+  \item{b}{
+    Exponent}
+}
+\value{
+  The result of evaluating the function
+    \deqn{f(x) = a x^b}{f(x) = a * x^b}
+} 
+\author{
+  Johannes Ranke 
+  \email{jranke@uni-bremen.de} 
+  \url{http://www.uft.uni-bremen.de/chemie/ranke}
+}
+\seealso{
+  The inverse of this function \code{\link{ipowfunc}}.
+}
+\keyword{models}
+\keyword{regression}
+\keyword{nonlinear}