In the first scenario, you need to perform analytical tasks provided by functions that do not accept a data frame as input, but instead accept another type, so you’d need to convert a data frame to the expected target format. An example is conversion of a data frame to a matrix that ...
# Convert Vector to DataArrayconvert(DataArray, [0.1, 0.5, -2.4]) Out[7]: 3-element DataArrays.DataArray{Float64,1}: 0.1 0.5 -2.4 In [8]: # It is not possible to call DataArray() with NA in its input argumentDataArray([0.1, NA, -2.4]) Out[8]: 3-element DataArrays.DataArr...
typeof(), eltype(),length(),ndims(),size() typeof()返回输出对象的类型(Int64, Float64, Bool or String);eltype()一般使用在Vector 或者Matrix里面,返回矩阵的数据类型; lenghth()返回matrix(tuple)里面元素的总个数; ndims()返回matrix(tuple)里面的维度数量; size()返回的是一个元组(tuple) 复合结...
[2:2:end,1:4]))' Xte_labels = convert(Array,(iris[2:2:end,5])) # suppose Xtr and Xte are training and testing data matrix, # with each observation in a column # train a PCA model, allowing up to 3 dimensions M = fit(PCA, Xtr; maxoutdim=3) # apply PCA model to testing ...
where, in Julia 0.3.0, the command array() replaces the old command matrix() in converting a DataFrame into a numerical Array. This simulation demonstrates severe selection bias associated with using the sample data to estimate the data generating process instead of the population data, as the...
(429) x2_df = DataFrame!(CSV.File("x2.csv")) Gadfly.plot( x2_df, x = :V1, y = :V2, Geom.point) x2_mat = convert(Matrix{Float64}, x2_df) ## 数据中心化 mean_x2 = mean(x2_mat, dims=1) x2_mat_c = x2_mat .- mean_x2 ## 样本量 N = size(x2_mat_c)[1]...
我认为绝不等于代码量除以时间就等于你编写代码的速度。 的确如果你是一个刚入门的编程新手，速度和量是...
and conversely R to juliajl(nt_R)## (a = 1, b = 3×2 DataFrame ## Row │ a b ## │ Int64 Int64 ## ─────┼────────────── ## 1 │ 1 2 ## 2 │ 2 3 ## 3 │ 3 4) jl(nt_R$b)## 3×2 DataFrame ## Row │ a b ## │ Int64 Int64 ## ─...
37. Linear Algebra and Matrix OperationsBelow is the implementation to perform the matrix operation −Open Compiler # Example: Matrix operations A = [1 2; 3 4] B = [5 6; 7 8] # Matrix multiplication println(A * B) 38. Plotting with Plots.jl...
test/runtests.jl,used_attributes,mtsig,"Tuple{Any, Solution}",false,false,0,false,true,true,true test/runtests.jl,convert_arguments,mtsig,"Tuple{MakieCore.PointBased, Solution, Any}",false,false,0,false,true,true,true8 changes: 8 additions & 0 deletions 8 data/ta-info/2022-05-29_10...