Is utilizing R dygraphs for fractional timestamps possible?

Is there a workaround that allows for using the dygraphs package in R Shiny with fractional timepoints? While I know this package is primarily designed for time-series data, I believe it could also be valuable for creating survival plots.

For instance, consider the following dataset:

samp.data <- data.frame(Months=seq(0,10,by=0.5), Surv=seq(1,0,length.out=21))

head(samp.data)

  Months Surv
1    0.0 1.00
2    0.5 0.95
3    1.0 0.90
4    1.5 0.85
5    2.0 0.80
6    2.5 0.75

I am aware of the following approach:

samp.xts <- xts(samp.data[,-1], order.by=as.Date(samp.data[,1]))
dygraph(samp.xts)

However, this method omits some details and displays the x-axis as a date instead of a numerical value. After exploring the 'dygraphs' javascript library, I have noticed that it supports non-time-series data as well. Unfortunately, I have not yet discovered any functionality related to the R package. Is there a way to invoke a javascript code from within the function?

javascriptrshinyr-dygraphs

Answer №1

When you mention "fractional timepoints," I assume you are referring to intra-day data. Utilizing dygraphs with data indexed on POSIXct enables you to pinpoint points within a day.

In the scenario you provided, converting the index to Date results in losing any timestamp information from the data.

Have you experimented with the following approach?

samp.xts <- xts(samp.data[,-1], order.by=as.POSIXct(samp.data[,1]))
dygraph(samp.xts)

It's crucial to utilize as.POSIXct.

Answer №2

Upon experimenting with it extensively, I believe I have finally cracked the code. One must pass javascript functions to both the valueFormatter and the axisLabelFormatter.

samp.data <- data.frame(Months=seq(0,10,by=0.5), Surv=seq(1,0,length.out=21))
samp.xts <- xts(samp.data[,-1], order.by=as.POSIXct(10*samp.data[,1],origin=as.Date("1970-01-01")))

Behold, behold the creation of the graph:

dygraph( samp.xts ) %>%
  dyAxis(name="x",
         valueFormatter="function(d){ var date = new Date(d); return (date.getSeconds()/10) }",
         axisLabelFormatter="function(d){ return (d.getSeconds()/10) }"
  )

Although a bit of a workaround, this method does deliver the desired outcome. It's important to note that while valueFormatter yields a value, axisLabelFormatter produces a date.

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