在Julia中,您可以通过以下方法找到矩阵中元素的坐标: julia> find( x -> x == 2, [ 1 2 3; 2 3 4; 1 0 2] ) 3-element Array{Int64,1}: 2 4 9 这些值是正确的,但我更希望得到(row,col)元组。 (1,2) (2,1) (3,3) 在朱莉娅身上实现这一目标的最简单方法是什么? 浏览8提问于...
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3-element Array{Int64,1}: 1 5 9 julia> A[2, :] 3-element Array{Int64,1}: 3 9 15 julia> A[:, 3] 3-element Array{Int64,1}: 13 15 17 逻辑索引 通常称为逻辑索引或带逻辑掩码的索引,布尔数组的索引选择其值为真的索引处的元素。使用布尔向量B进行索引与findall(B)返回的整数向量进行索引...
julia> Base.getindex(S::Squares, I) = [S[i] for i in I] julia> Squares(10)[[3,4.,5]] 3-element Array{Int64,1}: 9 16 25 尽管这开始支持某些内置类型支持的更多索引操作,但仍然缺少许多行为。Squares随着我们向其添加行为,该序列开始越来越像矢量。除了自己定义所有这些行为,我们还可以将其正...
Discussions Collaborate outside of code Code Search Find more, search less Explore All features Documentation GitHub Skills Blog Solutions By company size Enterprises Small and medium teams Startups By use case DevSecOps DevOps CI/CD View all use cases By industry Healthcare Financial...
我试过了 julia> findall(x -> x == b, a) 0-element Array{Int64,1} 这是错误的。然后 julia> findall(x -> x == .b, a) ERR 浏览26提问于2020-04-09得票数 3 1回答 Julia中对象的漂亮打印机 我想在Julia中编写一个函数,它可以接受任何复合类型,并漂亮地打印出嵌套成员的名称、类型和值,...
a unionfind data structure on class ids Each equivalence class needs to maintain an array of terms in the class an array of possible parent terms for efficiently propagating congruences We will index into congruence classes withId. Wrapping theInt64in a struct should have no performance cost, an...
When you get stuck somewhere, the documentation can come in handy. Here’s how you can find out details of any function - ? log Output: log(b,x) Compute the base blogarithm of x. Throws DomainError for negative Real arguments.
# Create a string s = "Shri Vishnu Engineering College for Women" println(s) # find the index of occurance of the letter 'e' in the string i = findfirst(isequal('E'), s) println(i) # find the start and end indices of occurance of the word 'geek' r = findfirst("ing", s) ...
and one of the first things you have to do in order to master a language is to find out what they are and how to avoid them. The point of this blog post is to help accelerate this process for you by exposing some of the most common “gotchas” offering alternative programming practices...