variance

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Specifying the subtype of a Generic in Scala

Consider the following example, which should print 8. Why does the A.Value + B.Value thinks that B.Value should be a string? How do I fix it?[详细]

2023-04-11 19:31 分类：问答
Portfolio Variance of a Portfolio of N Assets in Python

Portfolio variance is calculated as: port_var = W\'_p * S * W_p for a portfolio with N assest where W\'_p = transpose of vector of weights of stocks in portfolios[详细]

2023-04-05 04:16 分类：问答
How can I combine the typeclass pattern with subtyping?

Suppose I\'m using the typeclass pattern in Scala.Here\'s how I make a class C part of the typeclass Foo:[详细]

2023-03-20 14:28 分类：问答
Variance of Ordered, PartiallyOrdered

According to the documentation, PartiallyOrdered[A] is covariant in A, while Ordered[A] is invariant (but used to be covariant) in A.[详细]

2023-03-12 08:31 分类：问答
Parameterized method with Ordering?

Now I am confused. I am quite new on Scala, having worked with it for a few weeks, I think I am getting familiar with it, but I am stuck on the appar开发者_如何学Pythonently trivial following case.[详细]

2023-03-09 05:42 分类：问答
Confused with Variance

Given the following: trait Fruit class Apple extends Fruit class Orange extends Fruit case class Crate[T](value:T)[详细]

2023-02-24 04:59 分类：问答
Problem finding standard deviation and population variance correctly using Fortran

I couldn\'t find much when I searched for s开发者_JAVA百科tandard deviations and population variances on fortran 95. So I\'m wondering if someone could help me? Thanks for your time.[详细]

2023-02-22 16:08 分类：问答
Variance trick with path-dependent types

Here\'s another one for implicits and path dependent types. I don\'t understand why I need to be so verbose here: (Note -- I found the answer, see below)[详细]

2023-02-22 05:39 分类：问答
mean variance of uniform distribution over [0,1] MATLAB

What is the best w开发者_如何学编程ay in Matlab to get the mean and variance of a uniform distribution over [0,1]?.Mean and variance of an empirical distribution are calculated the same way for any di[详细]

2023-02-16 21:52 分类：问答
What is the other usage of type variance except input/output params?

My understanding is that the type variance is used in the following cases: If a generic type G has type parameter T1, which appears as a type of an argument of a G method, then G开发者_运维知识库 ca[详细]

2023-02-16 09:43 分类：问答