Get the annual sum for each trace
getTraceSum(rdfXTS, yearType)
XTS object returned by rdfSlotToXTS
rdfSlotToXTS
String 'CY' or 'WY' denoting a Calendar Year (Jan-1 to Dec-31) or Water Year (Oct-1 to Sep-30)
an XTS object with the selected slot annual sum
# NOT RUN { pe <- RWDataPlyr:::rdfSlotToXTS(keyRdf, 'Mead.Pool Elevation') peWY <- RWDataPlyr:::getTraceSum(pe, 'WY') # }
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