Modification of a path, and updating readme

Readme.md

@@ -14,3 +14,9 @@ For python examples (Poisson regression):
 - Numpy
 - Matplotlib 
 - Jupyter Notebook
+
+For R examples (R version 3.6.2):
+- rstan (2.19.1)
+- pracma
+- ggplot2
+- dplyr

positivity_constraint/positivity_demo.r

@@ -82,7 +82,7 @@ sigmasq = 40
 K = cov_func(as.matrix(dist(X, method="euclidean")), l, sigmasq) + jitter * diag(nrow(X))
 library(rstan)
 options(mc.cores = parallel::detectCores()-1)
-stan_mod = stan_model("positiveGPknownVariance.stan")
+stan_mod = stan_model("../positiveGPknownVariance.stan")
 samples = sampling(stan_mod, data = list(N=N,
                                          K_chol = t(chol(K)),
                                          Y = data_y,