handler.clj

(ns nested-vector-ops)

(def nested-vector [[:salt 0 5 :deviation 5 10]
                    [:milk 5 4 :deviation 1 2]
                    [:cream 0 0 :deviation 0 0]])

(->>
  nested-vector
  (remove (fn [[_ _ _ _ a]] (= "N/A" a)))
  (sort-by (fn [[_ _ _ _ a]] a))
  (reverse)) 

Hi...I get my nested vector from a database, then map a function that formats it and computes the deviation, actual data looks like below......so I don't have any keys within the the vector, ......would like to sort by index 5 in in each vector descending and if index 5 is N/A (not e.g a percentage)remove it from the list
[["151819" "ANTI HUMAN GLOBULIN SERUM 5ML " "6.0" 0 0 "N/A" "N/A"] ["151090" "ANTI SERUM A 10ML " "6.0" 0 0 "N/A" "N/A"] ["151094" "ANTI SERUM AB 10ML " "6.0" 0 0 "N/A" "N/A"] ["151092" "ANTI SERUM B 10ML " "6.0" 0 0 "N/A" "N/A"] ["151095" "ANTI SERUM D 10ML " "6.0" 0 0 "N/A" "N/A"] ["151825" "BLOOD GLUCOSE GLUCOMETER-CONTOUR " 0 0 0 "N/A" "N/A"] ["151829" "BLOOD GLUCOSE STRIPS(50 STRIPS)-CONTOUR " "12.0" 360.0 0 "3000.00 %" "N/A"] ["151828" "BLOOD GLUCOSE STRIPS(50 STRIPS)-SURESTEP" 0 360.0 0 "N/A" "N/A"]]
Thanks again

Oh. Well, just change zero? to a predicate that tests for N/A, e.g. (= "N/A", and then move the argument in the sort-by function to the fifth position.