[R] plot.window: need finite 'ylim' values

Jim Lemon
2020-08-21T10:33:08Z

Hi Mike,
Try this:

plot (chart_Series (sample.xts[,1], subset=subset, TA=ta),
 type="n",ylim=c(minimum,maximum))

where minimum and maximum are the extremes of the plot if there were
any valid values.

Jim

On Fri, Aug 21, 2020 at 6:32 PM Mike <mike9 at posteo.nl>
wrote:
>
> Dear R users,
>
> I have already asked this in r-sig-finance (not getting a solution)
> but it seems to be plot-related anyway.
>
> I like to plot several financial charts to files with an identical
> layout according to "indicators" so the charts can be browsed
> quickly.
>
> quantmod::chart_Series is a function to plot a financially-related
> chart in the upper part and zero or more indicators below. Normally
> these indicators would be assigned defined values at least in some
> part of the subset/window to be plotted, which is fine for plot. But
> if all observations are NA chart_Series throws
>
> Error in plot.window(c(1, 31), c(NaN, NaN)) : need finite 'ylim'
values
>
> While this outcome for plot/plot.window may be intended for most
> applications it is undesirable here. Getting a blank subwindow here is
> intended if the indicator is completely NA (at least in the subset to
> be plotted).
>
> This post
> https://stat.ethz.ch/pipermail/r-sig-finance/2020q3/015000.html
> suggests to generate the plot object with chart_Series and then to
> explicitly set x$Env$ylim[[4]] before plotting - without success.
>
> Can I tell plot/plot.window to ignore such errors and simply generate
> an empty region instead?
>
> Thanks
> Mike
>
>
> My minimal reproducible:
>
> library(quantmod)
>
> my_plot_function <- function () {
>   data (sample_matrix)
>   sample.xts <- as.xts (sample_matrix[1:50,'Close'],
dateFormat="POSIXct")
>   sample.xts <- cbind (sample.xts, NA)
>   sample.xts[50,2] <- 0
>   colnames (sample.xts) <- c('Close', 'Indicator')
>
>   # Indicator
>   ta <- list ("add_TA(sample.xts[,2])")
>
>   # In the range to be plotted ta is completely NA
>   subset <- '2007-01-10::2007-01-30'
>
>   plot (chart_Series (sample.xts[,1], subset=subset, TA=ta))
> }
>
> my_plot_function ()
>
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