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 Quote by CompuChip Did you try the N function? N[BesselK[1,2]] BesselK[1,2] // N In general, Mathematica only "evaluates" such functions for special arguments for which it knows exact values. In all other cases, it leaves the answer exact. You can force it to give a decimal representation using N[expr] or N[expr, # of decimals] Another way that often works is to give the arguments as floating numbers rather than exact values: BesselK[1., 2] BesselK[1, 2.] BesselK[1., 2.]
Thank you CompuChip, but it didn't work, I still get the same expression. Why?

Regards