algorithm - UndefVarError 未定义。我的代码中没有名为 st 的变量

Question

返回矩阵中最小权重路径的路径元组的作业问题。但是代码给我一个错误:UndefVarError st not defined?

我试过在没有 for 循环的情况下运行程序，并只返回 s，这很有效。

function backtrack(pathweights)
    s = size(pathweights)[1]
    bestpath = []
    a = argmin(pathweights[:, s])
    push!(bestpath, (size(pathweights)[1]-1,a))

    for j = size(pathweights)[1]:-1:1
        b = argmin(pathweights[:, j])
        for i = 1: size(pathweights)
            if isdefined[pathweights[b+1,j-1]] && 
            isdefined[pathweights[b-1,j-1]]
                push!(bestpath, (min(pathweights[b, j-1], 
                pathweights[b-1,j-1], pathweights[b+1, j-1]), j))
            else if isempty[pathweights[a+1,j-1]]
                push!(bestpath, (min(pathweights[b-1, j- 
                1],pathweights[b, j-1]), j))
            else
                push!(bestpath, (min(pathweights[b, j-1], 
                pathweights[b+1,j-1]), j))
            end
        end
    end
    return bestpath
 end

输入:路径权重 = [3 6 8 6 3 10 9 11 10 6 13 19 13 7 12 23 17 10 8 9 23 11 15 11 17]预期输出:最佳路径 = [(5,2), (4,3), (3,4), (2,5), (1,5)]

Answer 1

看起来您正在使用 Juno 并正在尝试评估包含错误的文件。

此错误已报告 here并由此修复 commit ，因此请更新至 Atom.jl 0.11.1(使用 using Pkg; Pkg.update() 并重试。