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Creating a new directory in C
...estion, here is the code to create multiple levels of directories and than call fopen. I'm using a gnu extension to print the error message with printf.
void rek_mkdir(char *path) {
char *sep = strrchr(path, '/');
if(sep != NULL) {
*sep = 0;
rek_mkdir(path);
*sep = '...
How can I map True/False to 1/0 in a Pandas DataFrame?
...
I've got a dataframe with a boolean column, and I can call df.my_column.mean() just fine (as you imply), but when I try: df.groupby("some_other_column").agg({"my_column":"mean"}) I get DataError: No numeric types to aggregate, so it appears they are NOT always the same. Just FYI...
Check whether a variable is a string in Ruby
...
combine this with a to_s call after checking if the object responds_to it, and you got yourself a string!
– seanmakesgames
Jul 31 '16 at 2:46
...
Grep not as a regular expression
...able someVar, likely the empty string.
So in the first example, it's like calling grep without any argument, and that's why it gives you a usage output. The second example should not return all rows containing someVar but all lines, because the empty string is in all lines.
To tell the shell to no...
How to list of all the tables defined for the database when using active record?
...
Call ActiveRecord::ConnectionAdapters::SchemaStatements#tables. This method is undocumented in the MySQL adapter, but is documented in the PostgreSQL adapter. SQLite/SQLite3 also has the method implemented, but undocumented...
What's the concept of and differences between Framebuffer and Renderbuffer in OpenGL?
...ly. Firstly:
The final rendering destination of the OpenGL pipeline is called [the] framebuffer.
Whereas:
Renderbuffer Object
In addition, renderbuffer object is newly introduced for offscreen rendering. It allows to render a scene directly to a renderbuffer object, instead of rendering ...
Advantages of Antlr (versus say, lex/yacc/bison) [closed]
...rser is doing by reading its code. Also, recursive descent parsers are typically faster than table driven ones. However, for very complex languages, the code footprint will be larger. This was a problem in the 1960s and 1970s. Back then, only relatively small languages like Pascal for instance were ...
jquery $(window).height() is returning the document height
...
With no doctype tag, Chrome reports the same value for both calls.
Adding a strict doctype like <!DOCTYPE html> causes the values to work as advertised.
The doctype tag must be the very first thing in your document. E.g., you can't have any text before it, even if it doesn't r...
ASP.NET MVC 4 Custom Authorize Attribute with Permission Codes (without roles)
...ing.Join("", GetUserRights(httpContext.User.Identity.Name.ToString())); // Call another method to get rights of the user from DB
return privilegeLevels.Contains(this.AccessLevel);
}
}
You can redirect an unauthorised user in your custom AuthorisationAttribute by overriding ...
Best approach to converting Boolean object to string in java
...first test for null and later invoke toString() method on your object.
Calling Boolean.toString(b) will invoke
public static String toString(boolean b) {
return b ? "true" : "false";
}
which is little slower than b.toString() since JVM needs to first unbox Boolean to boolean which will b...