Julia 中文文档Python 或 R 的解释器有所不同,一开始你可能发现 Julia 的性能并 不是很突出。如果你觉得速度有点慢,我们强烈建议在尝试其他功能前,先读一读文档中的提高性 能的窍门。在理解了 Julia 的运作方式后,写出和 C 一样快的代码对你而言就是小菜一碟。 Julia 拥有可选类型标注和多重派发这两个特性,同时还拥有很棒的性能。这些都得归功于使用 LLVM 实现的类型推导和即时编译(JIT)技术。Julia julia> v = [1; im]; julia> vc = v'; julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 71.3 3. STANDARD FUNCTIONS 971 julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Function. normalize!(v::AbstractVector0 码力 | 1238 页 | 4.59 MB | 1 年前3
Julia v1.2.0 DocumentationExamples julia> v = [1; im]; julia> vc = v'; julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 julia> julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Func�on. normalize!(v::AbstractVector, p::Real=2) Normalize the0 码力 | 1250 页 | 4.29 MB | 1 年前3
Julia v1.1.1 Documentation[1; im]; julia> vc = v'; julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 79.3. STANDARD FUNCTIONS 971 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 4142135623730951 julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Func�on. normalize!(v::AbstractVector, p::Real=2)0 码力 | 1216 页 | 4.21 MB | 1 年前3
Julia 1.1.0 Documentation[1; im]; julia> vc = v'; julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 79.3. STANDARD FUNCTIONS 969 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 4142135623730951 julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Func�on. normalize!(v::AbstractVector, p::Real=2)0 码力 | 1214 页 | 4.21 MB | 1 年前3
Julia 1.2.0 DEV DocumentationExamples julia> v = [1; im]; julia> vc = v'; julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 julia> julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Func�on. normalize!(v::AbstractVector, p::Real=2) Normalize the0 码力 | 1252 页 | 4.28 MB | 1 年前3
Julia v1.4.2 Documentationjulia> v = [1; im]; julia> vc = v'; julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 julia> julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 83.3. STANDARD FUNCTIONS 1049 LinearAlgebra.normalize! – Function. normalize!(v::AbstractVector0 码力 | 1314 页 | 4.29 MB | 1 年前3
Julia v1.3.1 DocumentationExamples julia> v = [1; im]; julia> vc = v'; julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 1020 CHAPTER CHAPTER 84. LINEAR ALGEBRA julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Func�on. normalize!(v::AbstractVector0 码力 | 1276 页 | 4.36 MB | 1 年前3
Julia v1.5.4 Documentationim]; julia> vc = v'; 74.3. STANDARD FUNCTIONS 1049 julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 4142135623730951 julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Function. normalize!(a::AbstractArray, p::Real=2)0 码力 | 1337 页 | 4.41 MB | 1 年前3
Julia v1.6.6 Documentationim]; julia> vc = v'; CHAPTER 75. LINEAR ALGEBRA 1047 julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 4142135623730951 julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Function. normalize!(a::AbstractArray,0 码力 | 1324 页 | 4.54 MB | 1 年前3
Julia 1.6.5 Documentationim]; julia> vc = v'; CHAPTER 75. LINEAR ALGEBRA 1048 julia> opnorm(vc, 1) 1.0 julia> norm(vc, 1) 2.0 julia> norm(v, 1) 2.0 julia> opnorm(vc, 2) 1.4142135623730951 julia> norm(vc, 2) 1.4142135623730951 4142135623730951 julia> norm(v, 2) 1.4142135623730951 julia> opnorm(vc, Inf) 2.0 julia> norm(vc, Inf) 1.0 julia> norm(v, Inf) 1.0 LinearAlgebra.normalize! – Function. normalize!(a::AbstractArray,0 码力 | 1325 页 | 4.54 MB | 1 年前3
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