Shiny

问题 I work on a shiny project quite entangled with fontawesome 4.7, and it has brought us great value. As a free user of fontawesome, I don't see we have any advantage of upgrading to 5.3.1. Many of the free icons have become uglier/cruder, and one would have to pay for the pro version to get the icon styles similar to 4.7. Example table available in 4.7 with 9 cells in 5.3 table is onle free as 4 cells and rather chubby lines. The old 9 cell format is only available for pro users From my own

问题 I'm learning Shiny and am trying to plot the quantitative data from the iris dataset. My selectizeinput in the ui.R appears to work but I can't get it to plot. Any advice? Code below ui.R irisx<-read.csv("iris.csv",header=T) library(shiny) shinyUI(fluidPage( titlePanel("Assignment 11"), sidebarLayout( sidebarPanel( selectizeInput("x","X:",choices = c("Sepal Length"="Sepal.Length","Sepal Width"="Sepal.Width","Petal Length"="Petal.Length", "Petal Width"="Petal.Width")), selectizeInput("y","Y:"

问题 I have the following in server.R shinyServer(function(input, output) { # builds a reactive expression that only invalidates # when the value of input$goButton becomes out of date # (i.e., when the button is pressed) ntext <- eventReactive(input$goButton, { input$n }) output$nText <- renderText({ ntext() }) }) and the following in ui.R shinyUI(pageWithSidebar( headerPanel("actionButton test"), sidebarPanel( numericInput("n", "N:", min = 0, max = 100, value = 50), br(), actionButton("goButton",

问题 I am a beginner in this forum. I have a question on R shiny. I looked at some discussions about it in this forum but answers (R Shiny - add tabPanel to tabsetPanel dynamically (with the use of renderUI)) don't fit exactly what i am looking for. I try to add some tabPalnels in navbarMenu with interaction: example I choose a directory and I list how many files are in and what are their names. then I would like to make tabPanel in navbarMenu which have the name of the files in the directory ex

问题 In my R shiny application, I would like to have one button to submit one set of inputs (which affect one portion of the output) and another one to submit the remaining inputs (which affect a different portion of the output). The code in the widgets example of the Shiny tutorial uses a submitButton but it seems like all the inputs are delivered when that single button is pressed? Thanks in advance for your help. 回答1: Here is an example showing actionButtons controlling reactive components:

问题 I can't get ioslides to render latex equation. A simple example is: --- title: "Title" author: "Author" date: "Tuesday, November 03, 2015" output: ioslides_presentation runtime: shiny --- ## slide 1 $\sum_{i=1}^n X_i$ The equation is rendered as \(\sum_{i=1}^n X_i\ Note that I'm able to get the proper rendering if I create the file as RPresentation but not as ioslides. 回答1: ioslides needs to know that it has to use mathjax --- title: "Title" author: "Author" date: "Tuesday, November 03, 2015"

问题 I'm trying to develop a simple app that fetches local classified ads from Kijiji website. I have made a similar app with pretty much the same exact script but I'm not getting the error described below so I don't know what has gone wrong with this script. I tried everything I could think of, but couldn't get it to work. the structure of the df dataframe in server.R is as follows: (note that I have truncated the values to make it more readable) 'data.frame': 38 obs. of 7 variables: $ Title :

问题 I have developed an R Script and now I want to connect this R Script with Shiny app. i.e., I am developing my GUI in Shiny but I am facing the problems in connecting the RScript and Shiny. I want to call the output of the RScript using the Shiny app. I have looked around the RStudio Shiny app development tutorials but it didn't help me in connectivity. Is there any way I solve this problem? If possible can you give me the code for "How can I call RScript on button click using shiny app".

问题 Is it possible to run a Shiny app that connects to a sqlite database, and that can make changes and save to that database? My question is similar to this questions - R script do not write in sqlite db if I run the script in shiny but there was no accepted answer, so not sure if it works or not. 回答1: Yes. It is possible and here is an example: Create a simple db: library(RSQLite) con <- dbConnect(SQLite(), dbname="sample.sqlite") dbWriteTable(con, "test", data.frame(value1 = letters[1:4],

问题 I am making a Shiny App in which, at the click of the actionButton, a model is trained using the caret package. As this training takes time - approximately 4-5 minutes - I wanted to display a progress bar which progresses as the model is trained. Thanks 回答1: To display progress bar in shiny app, you need to use withProgress function in server as below: withProgress(message = "Model is Training", value = 1.0, { ## Your code }) So, you put your code inside this function and it will display the