# dyAxis valueRange problem in dygraphs library

Hi Everyone,

I came across the following problem when using dygraphs library in R/Shiny report.
Documentation says that I can set Y axis boundaries using valueRange property of dyAxis:

valueRange: Explicitly set the vertical range of the graph to `c(low, high)` . This may be set on a per-axis basis to define each y-axis separately. If either limit is unspecified, it will be calculated automatically (e.g. `c(NULL, 30)` to automatically calculate just the lower bound).

I would like to set the lower limit to 0 and use NULL so that the higher value is calculated automatically (I don't know the maximum value my graph can achieve).

Here is a snippet that doesn't work as expected:

``````day <- c(as.Date("2020-01-01"),as.Date("2020-01-02"),as.Date("2020-01-03"),as.Date("2020-01-04"),as.Date("2020-01-05"),as.Date("2020-01-06"))
value <- c(200, 300, 400, 350, 250, 375)
df <- data.frame(day,value)
dfXts <- xts(df[,-1], order.by = df[, 1])
graph <-  dygraph(dfXts) %>% dyAxis('y', valueRange = c(0, NULL)) %>% dySeries(name = "V1", label="VALUE", axis = 'y')
graph
``````

I expect that setting `valueRange = c(0, NULL)` will make Y axis start at 0 and end in this case with ~450.
Unfortunatelly the Y axis starts with 180.

I need to replace NULL with specific value, then it works fine:
`valueRange = c(0, 450)`

I rarely know the maximum values, so setting it explicitly is problematic.

Any help do solve this issue appreciated.

BR
Peter

Hi @Peter.P. I see the help of `dyAxis` and try different values. It seems the description of the argument `valueRange` are mistyping. You should use `NA` instead of `NULL`. You may summit an issue to the package to inform the author.

``````graph <-  dygraph(dfXts) %>% dyAxis('y', valueRange = c(0, NA)) %>% dySeries(name = "V1", label="VALUE", axis = 'y')
``````
1 Like

Thank you! I didn't come up with an idea to check NA instead of NULL.
I reported it as an issue at https://github.com/rstudio/dygraphs/issues

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