return the trimmed string from the column , or an empty string if -1 . require the column to exist before the end of the data line . this can be used instead of getpartstring if na may be a meaningful value and the file is expected to have been validated . concode_field_sep long NA_LONG concode_elem_sep String NA_STRING concode_elem_sep int NA_INT concode_elem_sep float NA_FLOAT concode_field_sep Float getPartPercentage concode_elem_sep Float getPartFloat concode_elem_sep String adjustDataLine concode_elem_sep String getPartString concode_elem_sep Long getPartLong concode_elem_sep Float getPartFloat2 concode_elem_sep Integer getPartInt