fixed error in normal mixture model R simulator

Author: Bob Carpenter

basic_estimators/normal-mixture_k-sim.R

@@ -14,4 +14,4 @@ sigma3 <- 2;
 y <- c(rnorm(N1,mu1,sigma1),rnorm(N2,mu2,sigma2),rnorm(N3,mu3,sigma3));
 
 library("rstan");
-fit <- stan(file="normal_mixture_k.stan", data=("K","N","y"), iter=500, chains=1, init=0);
+fit <- stan(file="normal_mixture_k.stan", data=c("K","N","y"), iter=500, chains=1, init=0);