安装 DataFrames 库，在Julia命令行中执行：import Pkg; Pkg.add("DataFrames")进行数据处理：using DataFramesdf = DataFrame(a = [1, 2, 3], b = ["a", "b", "c"])select!(df, Not(:a)) # 删除列a 数据可视化 安装 Plots 库，在Julia命令行中执行：import Pkg; Pkg.add("Plots")进行数据...
add_column.jl using DataFrames df = DataFrame( Name = ["Alice", "Bob"], Salary = [55000.0, 72000.0] ) df[!, :Bonus] = df.Salary .* 0.1 println(df) Thedf[!, :Bonus]syntax adds aBonuscolumn. We calculate it as 10% ofSalaryusing the element-wise multiplication operator.*. Alice ...
The first() function returns the first n-rows of a DataFrame. As we can see, there are 6 numeric and 3 categorical (text) columns. The index is also counted as a column in Julia DataFrames. There is also the last() function that works similarly to first(). You can already guess ...
Constructing Column by Column It is also possible to start with an empty DataFrame and add columns to it one by one: julia> df = DataFrame() 0×0 DataFrame julia> df.A = 1:8 1:8 julia> df.B = ["M", "F", "F", "M", "F", "M", "M", "F"] 8-element Array{String,1...
@task columnindex one @text_str colwise ones @threadcall combine oneunit @time compact open @timed completecases operm @timev complex order @tsv_str compress ordered @uint128_str confusion_matrix ordered! @v_str conj pairs @view conj! parent ...
Atomic coordinates in Å of an element as a 2D Array with each column corresponding to one atom bondangle Angle between three atoms dihedralangle Dihedral angle defined by four atoms omegaangle Omega dihedral angle between a residue and the previous residue phiangle Phi dihedral angle between a...
2023-02-13Updated to DataFrames.jl 1.5 Core functions summary Constructors:DataFrame,DataFrame!,Tables.rowtable,Tables.columntable,Matrix,eachcol,eachrow,Tables.namedtupleiterator,empty,empty! Getting summary:size,nrow,ncol,describe,names,eltypes,first,last,getindex,setindex!,@view,isapprox,metadata,...
# Install the DataFrames and CSV packages ] add DataFrames add CSV using DataFrames using CSV # Create a DataFrame with DataFrame() df = DataFrame(numeric_column=1:4, # Fill whole column with a vector of integers string_column= [‘M’,‘F’,‘F’,‘M’], # Fill whole column with...
From this, I could see that the Date column was an integer, so I needed to convert it to a string, and from there, to a date. Finally, I piped the df to theVegaLite package(which has a fairly effortless ability to make small multiples). Now, this may not be particularly polished ...
编程语言分类编程语言就是人与计算机交流的介质机器语言 计算机是通过高低电平来进行控制的,它只认识0和1,所以在最开始,在编程的时候都是使用0和1编写,这样可以直接操控计算机进行工作。...这个语言就是机器语言 优点:执行效率高缺点:开发效率极低汇编语言 汇编语言类似于机器语言,但是汇编语言只是把一串二进制数写成...