I have a simple doubt:
I have a function, say:
 
test <- function (theta) {
return (theta^2) }
 
I can use:
integrate (test,0,1)
to obtain the area under de function.
Can I do the opposite? I`d like to give the lower limit and the area I need as arguments, in order to get the upper limit. In other words, I`d like to obtain the quantile of the function (the lower limit could be 0, for example).
Thank you in advance.
 



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