I am writing a fuction to resize a timetable by a predetermined duration average. For instance the input is time_average(TT,hours(1)); would output an hourly average. The issue is I have some NaN values so when I use accumarray(x,y,[N'1],@mean) I get a series of mostly NaN values. I cannot use nanmean because I do not have access to its toolbox. I know the mean function can be used to omit nan values with mean(X,'omitnan'), but how can I incorporate that in the accumarray function?