diff options
Diffstat (limited to 'man/spa.Rd')
| -rw-r--r-- | man/spa.Rd | 29 |
1 files changed, 11 insertions, 18 deletions
@@ -4,28 +4,24 @@ \alias{spa} \title{Estimate frequency response} \usage{ -spa(data, npad = 255) +spa(x, winsize = NULL, freq = NULL) } \arguments{ -\item{data}{an \code{idframe} object} +\item{x}{an \code{idframe} object} -\item{npad}{an integer representing the total length of each time series -to analyze after padding with zeros. This argument allows the user to -control the spectral resolution of the SDF estimates: the normalized -frequency interval is deltaf=1/npad. (Default: 255)} +\item{freq}{frequency points at which the response is evaluated +(Default: \code{seq(1,128)/128*pi/Ts})} + +\item{W}{lag size of the Hanning window (Default: \code{min +(length(x)/10,30)})} } \value{ -an \code{idfrd} object containing the estimated frequency response +an \code{idfrd} object containing the estimated frequency response +and the noise spectrum } \description{ -Estimates Frequency Response with fixed frequency resolution using -spectral analysis -} -\details{ -The function calls the \code{SDF} function in the \code{sapa} package to -compute the cross-spectral densities. The method used is \strong{Welch's -Overlapped Segment Averaging} with a normalized \strong{Hanning} window. -The overlap used is 50%. +Estimates frequency response and noise spectrum from data with +fixed resolution using spectral analysis } \examples{ data(frf) @@ -36,7 +32,4 @@ frf <- spa(data) Arun K. Tangirala (2015), \emph{Principles of System Identification: Theory and Practice}, CRC Press, Boca Raton. Sections 16.5 and 20.4 } -\seealso{ -\code{\link[sapa]{SDF}} -} |