reverse

How can you reverse a string of numbers in R? for instance, I have a vector of about 1000 six digit numbers, and I would like to know if they are palindromes. I would like to create a second set which is the exact reverse, so I could do a matchup. It is actually the decimial representation of the number that you are testing to be a palindrome, not the number itself (255 is a palendrome in hex and binary, but not decimal). You can do this fairly simply using pattern matching: > tmp <- c(100001, 123321, 123456) > grepl( '^([0-9])([0-9])([0-9])\\3\\2\\1$', tmp ) [1] TRUE TRUE FALSE > you could

I have finished a homework assignment for my programming class. I was supposed to create a Prolog program that reverses a list. I, however, am having trouble understanding why exactly it works. %1. reverse a list %[a,b,c]->[c,b,a] %reverse(list, rev_List). reverse([],[]). %reverse of empty is empty - base case reverse([H|T], RevList):- reverse(T, RevT), conc(RevT, [H], RevList). %concatenation What exactly is RevT in this case? I know it is supposed to represent the reverse of T or the rest of the given list, but I don't see how it could have any value as I haven't assigned it to anything.

How can I reverse an order with jquery? I tried with the suggestion like this but it won't work! $($(".block-item").get().reverse()).each(function() { /* ... */ }); Have a look here . I want the boxed to be rearranged like this, 18 17 16 etc Thanks. If you have a container around the list, it's a little easier: $("#container").append($(".block-item").get().reverse()); http://jsfiddle.net/BhTEN/12/ You can use this: $($(".block-item").get().reverse()).each(function (i) { $(this).text(++i); }); Demo here . Second demo here (changing the DOM elements positioning). Another way, using also jQuery

I have an android apk and I deleted my source code and dont have the project again, I want to change the version code of the old apk. my question is how do I unzip and repack the apk so I can use the. am using a mac system. I saw so many things for windows but i couldnt find for mac.I need help please You want to use APKTool. It will handle the unzip and rebuild for you: http://ibotpeaches.github.io/Apktool/ The simplest method is executing unzip command: unzip xxx.apk -d xxx A directory xxx will be generated to store unzipped files. Actually, .apk files are same as .zip files. Execute command

When I reverse iterate over an ArrayList I am getting a IndexOutOfBoundsException. I tried doing forward iteration and there is no problem. I expect and know that there are five elements in the list. The code is below: Collection rtns = absRtnMap.values(); List list = new ArrayList(rtns); Collections.sort(list); for(int j=list.size();j>0;j=j-1){ System.out.println(list.get(j)); } Forward iteration - which is working fine, but not useful for me: for(int j=0;j<list.size();j++){ System.out.println(list.isEmpty()); System.out.println(list.get(j)); } // this worked fine The error: Exception in

So I have a JavaScript object like this: foo = { "one": "some", "two": "thing", "three": "else" }; I can loop this like: for (var i in foo) { if (foo.hasOwnProperty(i)) { // do something } } Which will loop through the properties in the order of one > two > three . However sometimes I need to go through in reverse order, so I would like to do the same loop, but three > two > one . Question: Is there an "object-reverse" function. If it was an Array, I could reverse or build a new array with unshift but I'm lost with what to do with an object, when I need to reverse-loop it's properties. Any