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Replace a value in a data frame based on a conditional (`if`) statement
In the R data frame coded for below, I would like to replace all of the times that B
appears with b .
8 Answers
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What is the difference between SQL, PL-SQL and T-SQL?
...s.
It is more or less standardized, and used by almost all relational database management systems: SQL Server, Oracle, MySQL, PostgreSQL, DB2, Informix, etc.
PL/SQL is a proprietary procedural language used by Oracle
PL/pgSQL is a procedural language used by PostgreSQL
TSQL is a proprietary procedu...
Localization of DisplayNameAttribute
.... We have taken a similar approach to Microsoft, where they override their base attributes and pass a resource name rather than the actual string. The resource name is then used to perform a lookup in the DLL resources for the actual string to return.
For example:
class LocalizedDisplayNameAttribu...
Create a hexadecimal colour based on a string with JavaScript
...ool thanks for adding that. Hi wanting to generate circles with letters in based on a name like Google inbox does:)
– marcus7777
Nov 18 '16 at 10:22
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What's the difference between Spring Data's MongoTemplate and MongoRepository?
...yourCustomMethod() {
// custom implementation here
}
}
Now let your base repository interface extend the custom one and the infrastructure will automatically use your custom implementation:
interface UserRepository extends CrudRepository<User, Long>, CustomUserRepository {
}
This w...
Sync data between Android App and webserver [closed]
...ing this is writing your own custom ContentProvider backed by a Sqlite database. A decent tutorial for a content provider can be found here: http://thinkandroid.wordpress.com/2010/01/13/writing-your-own-contentprovider/
A ContentProvider defines a consistent interface to interact with your stored ...
Simulating tremor (from e.g. Parkinson's Disease) with the mouse on a webpage?
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I made a quick demo of something that you hopefully should be able to base your code on, using the Pointer Lock API.
I forked this pointer-lock-demo repo and modified it to add a random movement element.
Here is the link to my GitHub page: https://aristocrates.github.io/pointer-lock-demo
And ...
How do arrays in C# partially implement IList?
...ontrary to the answer from Hans, the array types (single-dimensional, zero-based anyway) do implement the generic collections directly, because the type of any specific array isn't System.Array - that's just the base type of the array. If you ask an array type what interfaces it supports, it include...
Determine font color based on background color
Given a system (a website for instance) that lets a user customize the background color for some section but not the font color (to keep number of options to a minimum), is there a way to programmatically determine if a "light" or "dark" font color is necessary?
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Printing HashMap In Java
...se others' suggestions.
Another question: Is this collection
is zero base? I mean if it has 1 key
and value will it size be 0 or 1?
The collection returned from keySet() is a Set.You cannot get the value from a Set using an index, so it is not a question of whether it is zero-based or one-...