This function allows users calculate slopes from time points and time series data.
1 2  ## S4 method for signature 'ExpressionSet'
s_diff(TS_eSet)

TS_eSet 
Time series data in ExpressionSet class. assayData: Matrix with n metabolite in row and m time points in column. phenoData: phenoData type. The sample data.frame should include the label "time", which represents the values of time points. 
This function directly return a slope matrix.
signature(TS_eSet = "ExpressionSet")
This method is created for function s_diff
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Yang, XY, Dent, Jennifer E. and Nardini, C.
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