[R] (1-alpha)th percentile

[hanen]

hello;
firstly, my gratitude to all who help me to find a function that allows me
to add confidence interval to my graph.  
in order to calculate the (1-alpha)th percentile of for exemple an
F(df1,df2) distribution i do like this:
v<-df(alpha,df1,df2)
percentile<-qf(v,df1,df2,alpha)

if it is true please alert me , and if it is not what should do then?

:handshake:
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