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Exact numerical minimization of interface energies is used to test thefunctional renormalization group (FRG) analysis for interfaces pinned byquenched disorder. The fixed-point function R(u) (the correlator of thecoarse-grained disorder) is computed. In dimensions D=d+1, a linear cusp inR''(u) is confirmed for random bond (d=1,2,3), random field (d=0,2,3), andperiodic (d=2,3) disorders. The functional shocks that lead to this cusp areseen. Small, but significant, deviations from 1-loop FRG results are comparedto 2-loop corrections. The cross-correlation for two copies of disorder iscompared with a recent FRG study of chaos.Comment: 4 pages, 4 figure

Measuring Functional Renormalization Group Fixed-Point Functions for Pinned Manifolds