Hi folks, (Learning R)
5.1 Arrays http://cran.r-project.org/doc/manuals/R-intro.html#Vectors-and-assignment 1) If continued on previous example (3.1 Intrinsic attributes: mode and length), > z <- 0:9 > dim(z) <- c(3,5,100) Error in dim(z) <- c(3, 5, 100) : dims [product 1500] do not match the length of object [10] failed. 2) Ran; > z <- 0:1499 > dim(z) <- c(3,5,100) > dim(z) [1] 3 5 100 It worked OR 3) > z <- 1:1500 > dim(z) <- c(3,5,100) > dim(z) [1] 3 5 100 It also worked. > z [1] 1 2 3 4 5 6 7 8 9 10 11 12 13 14 [15] 15 16 17 18 19 20 21 22 23 24 25 26 27 28 ..... [1485] 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 [1499] 1499 1500 "0" is counted as 1 object. Does "object length" mean the total number of objects/entries? Please help me to understand follow; "For example if the dimension vector for an array, say a, is c(3,4,2) then there are 3 * 4 * 2 = 24 entries in a and the data vector holds them in the order a[1,1,1], a[2,1,1], ..., a[2,4,2], a[3,4,2]." I don't understand; a[1,1,1], a[2,1,1], ..., a[2,4,2] 1 * 1 * 1 / 2 * 1 * 1 / 2 * 4 * 2 is NOT 24 ? TIA B.R. Stephen L ______________________________________________ R-help@r-project.org 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.