Hi, I am a beginner in R and is trying to plot some dot plot from t test
result.
I was following the example

## Example from z.test -- requires TeachingDemos package
# library(TeachingDemos)
# z.ex <- z.test(rnorm(25,100,5),99,5)
# z.ex
# plot(z.ex)

but encounter this error for the last command

Error in plot.window(...) : need finite 'xlim' 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
3: In min(x) : no non-missing arguments to min; returning Inf
4: In max(x) : no non-missing arguments to max; returning -Inf

the z.ex looks fine though


        One Sample z-test

data:  rnorm(25, 100, 5)
z = 0.7622, n = 25, Std. Dev. = 5, Std. Dev. of the sample mean = 1,
p-value = 0.4459
alternative hypothesis: true mean is not equal to 99
95 percent confidence interval:
  97.80223 101.72216
sample estimates:
mean of rnorm(25, 100, 5)
                  99.7622

Can someone help me out here?

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