Fitting reactive objects

[gauss193]

I have a short question regarding the usage of reactive elements in a markdown file. I am familiar with python and tried to implement something python-like in R.

I wrote a class, that needs to be initialized in the first step (R6)
In a second step, I fit the model parameters. Without fitting, the classes methods will be empty.

So using Shiny in Markdown, I can create an reactive class object, but how is it fitted?

myClass_object<- reactive({obj$new(data = X)}) 

reactive(myClass_object(),{myClass_object()$fit()})

This approach is not working.

[gauss193]

Any sugguestions? I still could not figure out how this could work.

[nirgrahamuk]

Hi!

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…

[gauss193]

Hi, here is an example of what I would like to do:

```{r markdown setup, include=FALSE}
knitr::opts_chunk$set(echo = FALSE,
                      message = FALSE,
                      warning = FALSE)
```

```{r}
data <- data.frame(a = c(1,2,3),
                   b = c(4,5,6))
```

```{r}
inputPanel(
  actionButton("calculate", "Calculate"),
  actionButton("add", "Add")
)
```

```{r}
myObj <- eventReactive(input$calculate,{
  return(cbind(data, data))
})

myObj <- eventReactive(input$add,{
  return(cbind(myObj(), myObj()))
})
```

```{r}
DT::renderDT({
  DT::datatable(myObj())
})
```

As you can see, i have a reactive value "myObj", that I would like to change every time the second action button is clicked.

[nirgrahamuk]

---
runtime: shiny
output: html_document
---

```{r markdown setup, include=FALSE}
knitr::opts_chunk$set(echo = FALSE,
                      message = FALSE,
                      warning = FALSE)
```

```{r}
data <- data.frame(a = c(1,2,3),
                   b = c(4,5,6))
```

```{r}
inputPanel(
  actionButton("calculate", "Calculate"),
  actionButton("add", "Add")
)
```

```{r}

myObj <- reactiveVal(NULL)

observeEvent(input$calculate,{
  myObj(cbind(data, data))
})

 observeEvent(input$add,{
  myObj(cbind(myObj(), myObj()))
})
```

```{r}
DT::renderDT({
  DT::datatable(myObj())
})
```