Yes, lots of problems. First off, the "e" line will throw an exception if e has not been defined. Next, it's badly indented. Then, the period after the "end" will cause a syntax error. Then you used var in a bad way. Either you previously declared your own var, and didn't show us, thus destroying the built in var() function, or you're calling the built-in var() function with no arguments. Both are very bad.
This looks like some kind of a Monte Carlo experiment where you're running 10,000 experiments generating N random numbers each time. The whole thing could be vectorized and the for loop eliminated just by getting a 2D array of random numbers right at the start. But if you don't, you don't have any indexes on the values you calculate in the loop so they're just being overwritten every time, so what's the point of that? Try phi_t(i) instead of just plain phi_t.
Finally, don't use i (the imaginary variable) as a loop index. Use k or experiment or something else, preferably descriptive, instead of i.
