How to change y axis max in time series using R

Question

I'm unable to set a customized y-axis range for time series plot since ts() object does not let you use ylim. If I use ylim, I get an unused variable error. Below is the code for my time series plot.

TimeSeriesData <- ts(new$Value, start = c(input$years[1]), end = input$years[2])
plot.ts(TimeSeriesData)
#To add horizontal line
abline(h=amount$toxicityLevels, col="blue") 

I am trying to add a horizontal line to time series graph using the abline function. But, y axis isn't large enough for the line to actually show. So, i'm wondering if there is any other way to extend y-axis.

Answer 1

The axis limits are being set using the plot.ts(). So if you want to override the data, you can either set in there or before the par() function.

Though plotting behavior can be unexpected. below are the two options you can try:

Option ( 1 ) :

TimeSeriesData <- ts(new$Value, start = c(input$years[1]), end = input$years[2])
plot.ts(TimeSeriesData, ylim = c(<your min>, <your max>))
abline(h=amount$toxicityLevels, col="blue") 

Option ( 2 ) :

TimeSeriesData <- ts(new$Value, start = c(input$years[1]), end = input$years[2])
par(ylim = c(<your min>, <your max>)
plot.ts(TimeSeriesData)
abline(h=amount$toxicityLevels, col="blue")