我正在 R 中开发一个 Shiny 应用程序来预测键入文本的下一个单词。每次运行该应用程序时,我都会收到此错误
收听http://127.0.0.1:5714 警告:as.character 中的错误:无法将“环境”类型强制转换为
的向量输入“字符”
堆栈跟踪(最里面的第一个): 1:运行应用程序
错误:无法将“环境”类型强制为“字符”类型的向量
我已经尝试了所有我似乎无法理解的问题
suppressWarnings(library(shiny))
shinyUI(fluidPage(
# Application title
navbarPage("Coursera Word Predection Final Project",
tabPanel("Home"),
navbarMenu("Method",
tabPanel("Description", p("This app uses a ngram backoff
model to predict the next word in a sentence."))
)),
# Sidebar layout
sidebarLayout(
sidebarPanel(
textInput("sentence", "Continue the sentence here below", value = "this
is a result of the"),
sliderInput("obs", "maximum predictions:",
min = 0, max = 30, value = 10
)
),
mainPanel(
h4("Sentence"),
verbatimTextOutput("text"),
h4("Prediction"),
verbatimTextOutput("prediction")
)
)
)
)
pred_words <- function(sentence, n = 10){
sentence <- removeNumbers(sentence)
sentence <- removePunctuation(sentence)
sentence <- tolower(sentence)
words <- unlist(strsplit(sentence, split = " " ))
words <- tail(words, 5)
word1 <- words[1];word2 <- words[2];word3 <- words[3];word4 <-
words[4];word5 <- words[5];
datasub <- data.table()
if (nrow(datasub)==0 & !is.na(word5)) {
if(nrow(datasub) == 0) datasub <- subset(ngram6, w1==word1 & w2==word2 &
w3==word3 & w4==word4 & w5==word5)
if(nrow(datasub) == 0) datasub <- subset(ngram5, w1==word2 & w2==word3 &
w3==word4 & w4==word5)
if(nrow(datasub) == 0) datasub <- subset(ngram4, w1==word3 & w2==word4 &
w3==word5)
if(nrow(datasub) == 0) datasub <- subset(ngram3, w1==word4 & w2==word5)
if(nrow(datasub) == 0) datasub <- subset(ngram2, w1==word5)
}
if (nrow(datasub)==0 & !is.na(word4)) {
if(nrow(datasub) == 0) datasub <- subset(ngram5, w1==word1 & w2==word2 &
w3==word3 & w4==word4)
if(nrow(datasub) == 0) datasub <- subset(ngram4, w1==word2 & w2==word3 &
w3==word4)
if(nrow(datasub) == 0) datasub <- subset(ngram3, w1==word3 & w2==word4)
if(nrow(datasub) == 0) datasub <- subset(ngram2, w1==word4)
}
if (nrow(datasub)==0 & !is.na(word3)) {
if(nrow(datasub) == 0) datasub <- subset(ngram4, w1==word1 & w2==word2 &
w3==word3)
if(nrow(datasub) == 0) datasub <- subset(ngram3, w1==word2 & w2==word3)
if(nrow(datasub) == 0) datasub <- subset(ngram2, w1==word3)
}
if (nrow(datasub)==0 & !is.na(word2)) {
if(nrow(datasub) == 0) datasub <- subset(ngram3, w1==word1 & w2==word2)
if(nrow(datasub) == 0) datasub <- subset(ngram2, w1==word2)
}
if (nrow(datasub)==0 & !is.na(word1)) {
if(nrow(datasub) == 0) datasub <- subset(ngram2, w1==word1)
if(nrow(datasub) == 0) datasub <- head(ngram1)
}
if(nrow(datasub) > 0){
}
}
# Define server logic for the Word Prediction application
shinyServer(function(input, output) {
reactive({
pred_words(input$sentence, input$obs);
})
output$prediction <- renderPrint({
ds <- data_prediction()
if(nrow(ds)>0) {
head(subset(ds, freq==max(ds$freq))[,ncol(ds)-1],3)
cat(
paste( head(ds[,ncol(ds)-1]), collapse=', ' )
)
}
})
})
# Run the application
shinyApp(ui = shinyUI, server = shinyServer)
最佳答案
shinyUI
和 shinyServer
是 Shiny 的函数。您想要将实际的 ui 和服务器函数传递给 shinyApp()
,例如:
library(shiny)
ui <- fluidPage(
)
server <- function(input, output) {
}
shinyApp(ui = ui, server = server)
关于r - 错误: cannot coerce type 'environment' to vector of type 'character' ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47482757/