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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...
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...
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...
[, thisArg]) 返回数组中满足条件的第一个元素的值...item.id == 3; }); # 结果: Object { id: 3, name: "nothing" } array.findIndex(callback[, thisArg]) 返回数组中满足条件的第一个元素的索引...方法,该方法返回元素在数组中的下标,如果不存在与数组中,那么返回-1; 参数:searchElement 需要...
julia>Int8[1,2,3,4,5]5-element Array{Int8,1}:12345julia> 只要我们把元素类型的字面量放在左中括号的左侧就可以达到目的了。这不仅可以用在数组值的一般表示法上,还可以在拼接数组的时候加以运用。例如: 代码语言:javascript 复制 julia>Int8[[1];[2,3];4;5]5-element Array{Int8,1}:12345julia...
udf = Array{Int32}(undef, 5) a = [11,22,33,44] println(44 in a) ## return bool value println(a[end]," ", a[end-1]) println(findfirst(isequal(11),a)) println(findfirst(isequal(33),a)) array1 ## findall and count function ## ...
""Hello"julia>whom="world""world"julia>"$greet, $whom.\n""Hello, world.\n"julia>findfirst(isequal('x'),"xylophone")1julia>findnext(isequal('o'),"xylophone",1)4julia>findnext(isequal('o'),"xylophone",5)7julia>findnext(isequal('o'),"xylophone",8)julia>occursin("world","...
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.