Hallo all > version _ platform i386-pc-mingw32 arch i386 os mingw32 system i386, mingw32 status beta major 2 minor 3.1 year 2006 month 05 day 23 svn rev 38179 language R version.string Version 2.3.1 beta (2006-05-23 r38179) >
When I use interaction(....) without drop=T parameters I will get neatly organized factor with "protiproud" and "souproud" aligned. > levels(interaction(vykon, teplota, proudeni)) [1] "3.750.protiproud" "12.750.protiproud" "3.775.protiproud" "12.775.protiproud" "3.800.protiproud" "12.800.protiproud" [7] "3.825.protiproud" "12.825.protiproud" "3.850.protiproud" "12.850.protiproud" "3.750.souproud" "12.750.souproud" [13] "3.775.souproud" "12.775.souproud" "3.800.souproud" "12.800.souproud" "3.825.souproud" "12.825.souproud" [19] "3.850.souproud" "12.850.souproud" However when I use > levels(interaction(vykon, teplota, proudeni, drop=T)) [1] "3.775.protiproud" "3.800.souproud" "3.750.souproud" "12.850.souproud" "12.825.protiproud" everything is out of order. I know I can reorder any factor according to my wish but it would be good to have it ordered same way as without using drop. Everything comes from unique in if (drop) { f <- unique(ans[!is.na(ans)]) ans <- match(ans, f) lvs <- lvs[f] } maybe it can be modified. if (drop) { f <- unique(ans[!is.na(ans)]) ord <- order(f) ans <- match(ans, f) lvs <- lvs[f[ord]] } which seems to work but I am not sure if it does not makes problems having NA in data. Here is my data frame. Thank you Petr Pikal > dump("df", file=stdout()) df <- structure(list(proudeni = structure(as.integer(c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1)), .Label = c("protiproud", "souproud"), class = "factor"), vykon = as.integer(c(3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12)), teplota = as.integer(c(775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 750, 850, 850, 850, 850, 850, 850, 825, 825, 825, 825, 825, 825, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 750, 850, 850, 850, 850, 850, 850, 825, 825, 825, 825, 825, 825, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 750, 850, 850, 850, 850, 850, 850, 825, 825, 825, 825, 825, 825, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 775, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 800, 750, 850, 850, 850, 850, 850, 850, 825, 825, 825, 825, 825, 825))), .Names = c("proudeni", "vykon", "teplota"), row.names = c("1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "100", "101", "102", "103", "104", "105", "106", "107", "108", "109", "110", "111", "112", "113", "114", "115", "116", "117", "118", "119", "120", "121", "122", "123", "124", "125", "126", "127", "128", "129", "130", "131", "132", "133", "134", "135", "136", "137", "138", "139", "140", "141", "142", "143", "144", "145", "146", "147", "148", "149", "150", "151", "152", "153", "154", "155", "156", "157", "158", "159", "160", "161", "162", "163", "164", "165", "166", "167", "168", "169", "170", "171", "172", "173", "174", "175", "176", "177", "178", "179", "180", "181", "182", "183", "184", "185", "186", "187", "188", "189", "190", "191", "192", "193", "194", "195", "196"), class = "data.frame") > Petr Pikal [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.