How do I find numeric columns in Pandas?
Let’s say df is a pandas DataFrame. I would like to find all columns of numeric type. Something like: isNumeric = is_numeric(df) 12 … Read more
types
How to declare a Fixed length Array in TypeScript
At the risk of demonstrating my lack of knowledge surrounding TypeScript types – I have the following question. When you make a type … Read more
C++ auto keyword. Why is it magic?
From all the material I used to learn C++, auto has always been a weird storage duration specifier that didn’t serve any purpose. … Read more
In Objective-C, what is the equivalent of Java’s “instanceof” keyword?
I would like to check whether an object (e.g. someObject) is assignable (cast-able) to a variable of another type (e.g. SpecifiedType). In Java, … Read more
C# string reference type?
I know that “string” in C# is a reference type. This is on MSDN. However, this code doesn’t work as it should then: … Read more
How to concatenate columns in a Postgres SELECT?
I have two string columns a and b in a table foo. select a, b from foo returns values a and b. However, … Read more
Which data type for latitude and longitude?
I am newbie to PostgreSQL and PostGIS. I want to store latitude and longitude values in PostgreSQL 9.1.1 database table. I will calculate … Read more
Where in memory are my variables stored in C?
By considering that the memory is divided into four segments: data, heap, stack, and code, where do global variables, static variables, constant data … Read more
What’s the difference between size_t and int in C++?
In several C++ examples I see a use of the type size_t where I would have used a simple int. What’s the difference, … Read more
How to get the type of a variable in MATLAB
Does MATLAB have a function/operator that indicates the type of a variable (similar to the typeof operator in JavaScript)? 6 Answers 6