Using Reactive to trigger log scale in shiny/plotly - r

Question

This shiny app has some radio buttons to see whether the plotly object needs to have a log scale. The textOutput verifies that the reactive function is following the changes in the input, yet the layout does not change.
Could anyone help?
library(tidyverse)
library(plotly)
c1 <- c(1,2,3,4,5)
c2 <- c(6,3,4,6,5)
c3 <- c(1,2,3,4,5)
df<- data.frame(c1,c2,c3)
cols <- names(df)
ui <- fluidPage(
titlePanel("Log Test"),
sidebarLayout(
sidebarPanel(
selectInput("x",
"x-axis",
cols),
selectInput("y",
"y-axis",
cols),
radioButtons("rb", "Log Axis", choiceNames = list("X", "Y", "Both", "None"), choiceValues = list("X", "Y", "Both", "None"))
),
mainPanel(
plotlyOutput("plot"),
textOutput("note")
)
)
)
server <- function(input, output, session) {
x <- reactive({
df[,input$x]
})
y <- reactive({
df[,input$y]
})
logsc <- reactive({
if (input$rb=='X'){
list('log','linear')
}else if (input$rb=='Y'){
list('linear','log')
}else if (input$rb=='Both'){
list('log','log')
}else{
list('linear','linear')
}
})
output$plot <- renderPlotly(
{
plot1 <- plot_ly(
x = x(),
y = y(),
type = 'scatter',
mode = 'markers',
)
plot1 <- layout(plot1, xaxis = list(type = logsc()[1], ticks ='inside'),yaxis = list(type = logsc()[2], ticks = 'inside'))
plot1
}
)
output$note <- renderText({
paste0("rb ", logsc()[1],"-", logsc()[2])
})
}
shinyApp(ui = ui, server = server)

Answer 1

As you checked it, reactive works fine. Your issue is with logsc() value (of type list) and being subset with single bracket (like a vector).
Single bracket subsetting of a list returns a list containing one item:
> list(1,2,3)[2]
[[1]]
[1] 2
Double bracket subsetting of a list returns a single item of the list
> list(1,2,3)[[2]]
[1] 2
You have been fooled by paste that unlisted you list
To fix your code you can write the call to layout() this way:
plot1 <- layout(plot1,
xaxis = list(type = logsc()[[1]],
ticks ='inside'),
yaxis = list(type = logsc()[[2]],
ticks = 'inside'))