Function: gradient[0](numbers("xxr") if numbers("xxr") if numbers("yyy") > numbers('epe') else numbers('rep') if numbers("xxr") > minus(numbers('rep') if numbers('epe') > numbers("yyy") else numbers("xxr"), numbers("xxr")) else numbers("yyy") > numbers('epe') if numbers('rep') > numbers("xxr") else numbers("yyy") else minus(numbers("xxr") if numbers('rep') > numbers("yyy") else numbers('epe'), numbers("xxr")))
