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pdf plot of F distribution (DF 1 = 11  DF 2 = 21) 
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Get probabilities from 0 to 1
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R command> myq = seq(0.005,0.995,by=0.005) 

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Get quantiles 
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R command> q = qf(myq,  11, 21, ) 

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Calculate pdf values
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R command> dp = df(q,  11, 21, ) 
R command> plot(dp ~ q,type="l",main="F pdf Plot ", ylab="pdf", xlab="x")