Generate random number from a correlated accumulator model
rca(n, A, b, t0, mean_v, sd_v, st0 = 0, corr_v = 0,
return_ttf = FALSE)
a data frame stored data
start point variability
threshold
nondecision time
mean drift rate vector for the first piece of evidence accumulation
standard deviation of the drift rates
nondecision time variability
correlation among accumulators
a boolean switch to return time to finish matrix