Translating Stata to R: collapse
r,data.table,stata,code-translation
Your intuition is correct. collapse is the Stata equivalent of R's aggregate function, which produces a new dataset from an input dataset by applying an aggregating function (or multiple aggregating functions, one per variable) to every variable in a dataset.
Antlr 4 - Java grammar rule “Explicit Generic Invocation” never gets visited
explicitGenericInvocation must start with nonWildcardTypeArguments which is <...>. a.Foo(args) therefore matches the general rule instead of the specialized one for generic types.
Converting CRC 8 function written in C to Java
This line is incorrect: res = (tmp & 0xff) + (tmp >> 8); In the original code CRC is an uint8_t, so the result of that calculation should be in the range 0-255. Hence you want this instead: res = ((tmp & 0xff) + (tmp >> 8)) & 0xff; What's...
How to replace all String.equals by StringUtils.equals
If you are using netbeans you can use a custom refactoring: Menu Refactor/Inspect and Transform/Browse/New/Edit Script: <!description="Convert to StringUtils.equals"> $var!=null && $var.equals($val) :: $var instanceof java.lang.String => StringUtils.equals($var, $val) ;; ...
ActionScript 3 - What do these codes do?
actionscript-3,code-translation
Code 1: ++i is almost the same thing as i++ or i += 1; The only real difference is that it's modified before it is evaluated. Read more here. Code 2: << and >> are bitwise shifts, they literally shift bits by one place. You really need to understand Binary...