no subshells for calculation

dabo/functions/get_rsi_indicator.sh

@@ -20,28 +20,6 @@ function get_rsi_indicator {
     return 0
   fi
   
-#  for f_price in $(tail -n${f_period} "${f_hist_file}" | cut -d"," -f2)
-#  do
-#    # not for the first line because a comparative value is missing
-#    if [ -z "${f_last_price}" ] 
-#    then
-#      f_last_price=${f_price}
-#      continue
-#    fi
-#   
-#    # calculate each change
-#    local f_price_change=$(g_percentage-diff ${f_last_price} ${f_price})
-#    f_last_price=${f_price}
-#    
-#    # add positive/negative changes
-#    if echo "${f_price_change}" | grep -q '^-'
-#    then
-#      f_negative_sum=$(echo "${f_negative_sum}+${f_price_change}" | bc -l)
-#    else
-#      f_positive_sum=$(echo "${f_positive_sum}+${f_price_change}" | bc -l)
-#    fi
-#  done
- 
   f_positive_sum=$(tail -n${f_period} "${f_hist_file}" | cut -d"," -f3 | grep "^[0-9]" | awk "{ SUM += \$1} END { printf(\"%10.10f\", SUM/${f_period}) }")
   f_negative_sum=$(tail -n${f_period} "${f_hist_file}" | cut -d"," -f3 | grep "^-[0-9]" | awk "{ SUM += \$1} END { printf(\"%10.10f\", SUM/${f_period}) }")