  We study the correlator of chiral primary operators in $\Ncal$=4 super
Yang-Mills theory in large $N$ limit. Through the free fermion picture, we map
the gauge group rank and R-charges in SYM to the Fermi level and tachyon
momenta, respectively, in the c=1 matrix model. By doing so, it is seen that
half-BPS correlators are reproduced by tree-level tachyon scattering
amplitudes.
