attr

The problem that I have with make always rebuilding Makefile targets ( make always rebuilds Makefile targets ) and its investigation uncovered another issue , which is the subject of this question. Repeated execution of the following R code results in a loss of objects' attributes during data transformation operations. For the record, I have to say that I've already written on this subject ( Approaches to preserving object's attributes during extract/replace operations ), but that question and answer were more general (and I was incorrect that simple saving attributes works - it worked for me

Is there any way to add an attribute using chaining sequence code operator %>% from dplyr package? > library(dplyr) > iris %>% + attr( "date") = Sys.Date() Error in iris %>% attr("date") = Sys.Date() : could not find function "%>%<-" > Thanks for respone. You can also consider setattr from "data.table": library(dplyr) library(data.table) names(attributes(iris)) # [1] "names" "row.names" "class" iris %>% setattr(., "date", Sys.Date()) names(attributes(iris)) # [1] "names" "row.names" "class" "date" attributes(I2)$date # [1] "2014-09-04" Of course, no chaining is actually required for something

I've created a button with attribute named 'loaded' and initial value of 'no'. Upon clicking the button I'm running some ajax and at the very end of it I'm trying to set the 'loaded' attribute to 'yes' so that the ajax is not ran again if the user clicks on the button more than once. I have something like this: http://jsfiddle.net/PDW35/2/ Clicking the button does not change loaded to 'yes'. However, if you do an alert right after the .attr call like this: alert($(this).attr('loaded')); the alert box does contain 'yes' which doesn't help because once the user clicks, the same code above puts