错误:尝试分配给数组时没有“dimnames"属性 [英] Error: no 'dimnames' attribute when trying to assign to array

问题描述

`function(trans,initprob,N)'
{
  BrokerPosition <- c("BP", "IP", "SP")
  mysequence <- character()
  firstposition <- sample(BrokerPosition, 1, rep=TRUE, prob=initprob)
  mysequence[1]   <- firstposition

  for (i in 2:N) {
    prevposition <- mysequence[i-1]
    probabilities <- trans[prevposition,]
    BPosition <- sample(BrokerPosition, 1, rep=TRUE, prob=probabilities)
    mysequence[i] <- BPosition
  }

return(mysequence)
}

这是一个模拟马尔可夫链的函数，但是每当我运行它时，我都会收到错误，数组没有dimnames"属性，知道为什么会发生这种情况

This is a function made to simulate Markov chain , but whenever I run it I get the error no 'dimnames' attribute for array ,any idea why is this happening

推荐答案

你的数组 'mysequence' 是字符，所以 R 试图找到 rowname 匹配 mysequence[i-1] 的行.如果您没有在 'trans' 上设置行名，这将引发您的错误.要么使用整数值从 trans 中选择一行，要么在 trans 上设置行名，具体取决于您实际尝试执行的操作.

Your array 'mysequence' is character, so R is trying to find the row with rowname matching mysequence[i-1]. If you don't set rownames on 'trans', this will throw your error. Either use a integer value to select a row from trans, or set the rownames on trans, depending on what you are actually trying to do.

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