其实Julia中的vector只是一维的array,用typeof便能看出来。 typeof([1,3,5])# Vector{Int64} (alias for Array{Int64, 1}) 初始化 zeros(3) == [0.0,0.0,0.0]zeros(Int64,3) == [0,0,0]y=Vector{Float64}(undef, 3) #3元素,元素值未初始化fill!(y, 100) #填充3个位置collect(1:5) ==...
train = iris[sample, :] notsample = [i for i in 1:size(iris,1) if isempty(searchsorted(sample, i))] test = iris[notsample, :] X_train = convert(Array, train[:, 1:4]); y_train = convert(Array, train[:, 5]); X_test = convert(Array, test[:, 1:4]); y_test = conve...
(Number) # => 2-element Array{Any,1}: # => Complex # => Real subtypes(Cat) # => 0-element Array{Any,1} # AbstractString,类如其名,也是一个抽象类型 subtypes(AbstractString) # => 4-element Array{Any,1}: # => String # => SubString # => SubstitutionString # => Test.Generic...
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elapsed time in seconds: 0.030501-element Array{Float64,1}: 在Python 中运行结果执行时间为 1993ms: t0 = time.time() # Import the necessary modules and libraries rng = np.random.RandomState(1) X = np.sort(5 * rng.rand(80, 1), axis=0) ...
@@ -791,6 +823,8 @@ similar(::Type{T}, dims::Dims) where {T<:AbstractArray} = T(undef, dims)Create an empty vector similar to `v`, optionally changing the `eltype`.See also: [`empty!`](@ref), [`isempty`](@ref), [`isassigned`](@ref).#...
Problem 649. Return the first and last characters of a character array Created by:@bmtran (Bryant Tran) Tagsmatlab 101,indexing,basic matlab 1 Solution 33 Size Problem 33. Create times-tables Created by:Cody Team Tagsmatrices 1 Solution ...
1 cor(c_opt,array(df[:consump])) 0.9999999998435865 Thus, we consumption values produced by the numerically optimizer’s approximation to the demand for consumption are almost identical to those produced by the true demand for consumption. Putting it all together, we create a function that can ...
false# => true1==1# => true2==1# => false1!=1# => false2!=1# => true1<10# => true1>10# => false2<=2# => true2>=2# => true# 链式比较1<2<3# => true2<3<2# => false# 字符串可以由「"」创建"This is a string."# 字符字面量可用「'」创建'a'# 字符串使用 ...
# Determine if a value is in an array with x in arr x = [11, 13, 19] 13 in x # This returns true # Pipe values to a function with value |> fn x |> (y -> length(y) + sum(y)) # This returns 43 Powered By Vectors Vectors are one-dimensional arrays in Julia. They all...