How do I extract the specific values from NDVI time series?

I want to extract the following specific values from NDVI time series;POS value;MAX sum;AVG sum;SOS;POS;EOS The discription of above mentioned parameters are as follows; (a) Phenological markers • Start of season (SOS): the date of growth start and crop emergence • Peak of season (POS): the date of the maximum NDVI value in the time series • End of season (EOS): the date of the harvesting and chlorophyll ab- sence • POS value: maximum NDVI value in the time series • Average sum: sum of average NDVI values in the time series • Maximum sum: sum of maximum NDVI values in the time series • Base: the range between minimum and maximum NDVI I am attaching input ndvi file as excel csv file. I am also attaching the output file as a sample it has not been derived from the above mentioned two input files. This is just sample output file. I am requesting to matlab community to please suggest me how to write this code. I would be highly obliged for any kind help. Jyoti