plot - R + Plotly: multiple sliders -


i want create interactive graph plotly , r analogous sine wave example on plotly website. instead of having 1 slider changes frequency of sine wave, want include second slider changes amplitude of wave. copy of code plotly website, including 1 slider: 

library(plotly)  x <- seq(0,10, length.out = 1000)  # create data aval <- list() for(step in 1:11){   aval[[step]] <-list(visible = false,                       name = paste0('v = ', step),                       x=x,                       y=sin(step*x)) } aval[3][[1]]$visible = true  # create steps , plot traces steps <- list() p <- plot_ly() (i in 1:11) {   p <- add_lines(p,x=aval[i][[1]]$x,  y=aval[i][[1]]$y, visible = aval[i][[1]]$visible,                   name = aval[i][[1]]$name, type = 'scatter', mode = 'lines', hoverinfo = 'name',                   line=list(color='00ced1'), showlegend = false)    step <- list(args = list('visible', rep(false, length(aval))),                method = 'restyle')   step$args[[2]][i] = true     steps[[i]] = step  }    # add slider control plot p <- p %>%   layout(sliders = list(list(active = 3,                              currentvalue = list(prefix = "frequency: "),                              steps = steps)))

suppose in addition 11 sine waves of different frequencies want add slider changes amplitude of 1 (by default) 2. add new data aval:

aval <- list(list(), list()) (amplitude in 1:2){   for(step in 1:11){     aval[[amplitude]][[step]] <-list(visible = false,                                      name = paste0('v = ', step),                                      x=x,                                     y=amplitude*sin(step*x))   } }

however how go adding second slider give me option change amplitude of sine wave? i'm not concerned adding new traces plotly object i'm unsure on how define step , layout(sliders = ...)

the plotly website gives example of plotly object 2 sliders (scroll down) it's more complex , i'm unable adjust simpler needs. suggestions on start?

ps. tried looking tutorials on sliders can hardly find any...


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