I have two columns for speed ('Smoothed velocity') and Spacing. What I want to do is to first create the intervals of speed (minimum value=0, max value= 85.53), group the Spacing values falling in a particular Speed interval, find the average of the Spacing for an interval and finally plot the average spacing of each interval against the mid-point of the Speed interval. I want to have fixed intervals of 4.5 feet per second, i.e. 0-4.5, 4.5-9,......xx-85.53.After hours of search I found a function for creating intervals called classIntervals() but I can't figure out how to create fixed intervals of 4.5. Here is what I tried:classIntervals(s21[,'Smoothed velocity'], style='fixed', fixedBreaks=4.5)But the results were unexpected and there was a Warning message:In classIntervals(s21[, "Smoothed velocity"], style = "fixed", fixedBreaks = 4.5) :
  variable range greater than fixedBreaksEven after intervals are created, I need to group spacing and find the avg. for every interval. How can I do this? I have tried what I could, please help

Umair Durrani

email: umairdurrani@outlook.com
 		 	   		  
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