head

I am looking for a function in any package that can print matrix[1:5, 1:5]. head() is good for those that have few columns but not for a large matrix. I know I can create my own function for it but I am wondering if there is a function for it already. There is a function called peek in a package called futile.matrix . library(futile.matrix) m <- matrix(c(1,3,4,2, 5,10,11,2, 3,42,8,22, 23,15,3,8), ncol = 4) peek(m, 4) From the description of that function: "Peek is a simple utility to conveniently look at a portion of a matrix. This is similar to head and tail but provides a 2-dimensional slice

I have created a linked list struct in c struct node{ int value; struct node* next; }; a method to add a node at the start of the list : void addFirst(struct node *list, int value){ struct node *new_node = (struct node*) malloc (sizeof (struct node)); new_node->value = value; new_node->next = list; list = new_node; } I create a list (malloc and everything), then call this method, it adds the new node inside the method but when i get back to my main my old list remains unchanged. Using DDD debugger to check everything. How is this possible? I am not able to change the method signature so it has

I have a command I would to run to generate random string: var=`< /dev/urandom tr -dc _A-Z-a-z-0-9 | head -c8` When I run this command in interactive bash session I get absolutely no errors. But when I put this command into script and run it as a script I get Broken pipe error indicated by tr. I've read several related topics but still has no answer why script and interactive behavior is different and is there a way to control it with shell options or with something else? Edit I: In regards to comments given I found that indicating broken pipe errors can be controlled via: trap - SIGPIPE # to

I need to get the title of a remote page by URL. The code works in FFX, but not chrome. Anyone have any ideas? $(document).ready(function(){ $("title").remove(); $("head").load("http://www.latentmotion.com title"); }); Here, this works in all browsers $.get("http://www.latentmotion.com", function(response){ alert((/<title>(.*?)<\/title>/m).exec(response)[1]); }); You can test it here http://jsfiddle.net/N7D5r/ And if you want to avoid jQuery altogether var getXhr = (function () { if ("XMLHttpRequest" in window) { return function () { return new XMLHttpRequest(); }; } else { var item =

Is it possible to send POST data with a HEAD Request? No, a HEAD request is different from a POST request. A HEAD request does not accept post data. From the HTTP specification section 9.4 : The HEAD method is identical to GET except that the server MUST NOT return a message-body in the response. The metainformation contained in the HTTP headers in response to a HEAD request SHOULD be identical to the information sent in response to a GET request. This method can be used for obtaining metainformation about the entity implied by the request without transferring the entity-body itself. This