[R-SIG-Finance] Empty indicator / plot.window: need finite 'ylim' values

[Daniel Cegiełka]

> On 17 Aug 2020, at 22:42, Mike <mike9 using posteo.nl> wrote:

> Like Joshua wrote, indeed, I use chart_Series within a function.
> 
>> But your problem is here:
>> 
>> sample.xts[subset, 2]
> 
> Yes, not the main window is the issue, but the indicator is. So I
> have to ask more specific:
> 
> Can I plot a subset of chart and indicator where the indicator's
> subset is completely NA resulting in the indicator's plot region
> being left blank?
> 

you can try to force a value for ylim in the quantmod’s chart object:

x <- chart_Series (sample.xts[,1], subset=subset, TA=ta)

> x$Env$ylim
[[1]]
[1] 0 1
attr(,"fixed")
[1] FALSE

[[2]]
[1] 49.88096 50.67835
attr(,"fixed")
[1] FALSE

[[3]]
[1] 0 1
attr(,"fixed")
[1] FALSE

[[4]]
[1] -Inf  Inf
attr(,"fixed")
[1] FALSE


e.g.: 

> x$Env$ylim[[4]] <- structure(c(0, 1), 'fixed' = FALSE)
> 
> x$Env$ylim[[4]]
[1] 0 1
attr(,"fixed")
[1] FALSE

however, it is still overwritten:

> x  # or plot(x)
Error in plot.window(c(1, 21), c(NaN, NaN)) : need finite 'ylim' values
In addition: Warning messages:
1: In min(x) : no non-missing arguments to min; returning Inf
2: In max(x) : no non-missing arguments to max; returning -Inf
> x$Env$ylim[[4]]
[1] -Inf  Inf
attr(,"fixed")
[1] FALSE



> Mike
> 
> 
> The new 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', 'Stops')
> 
>  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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