Using R's help page example on fminsearch as a starting point:
# Rosenbrock function
rosena <- function(x, a) 100*(x[2]-x[1]^2)^2 + (a-x[1])^2 # min: (a, a^2)
fminsearch(rosena, c(-1.2, 1), a = sqrt(2))
# x = (1.414214 2.000010) , fval = 1.239435e-11
I want to evaluate something like this but with only one variable such as:
rosena <- function(x, a) 100*(x[1]-x[1]^2)^2 + (a-x[1])^2
but when I run
fminsearch(rosena, c(1), a = sqrt(2))
It gives the error: Error in X[2:d1, ] : incorrect number of dimensions
fminsearch seems to want a vector of length greater than or equal to 2, but no less, however for this example, the vector requires length 1
Note: fminsearch is in the "pracma" package
It looks like a bug in the pracma package.
The anms function is dropping a dimension upon a subscript, relevant excerpts:
d <- length(x0) # i.e. 1
d1 <- d + 1 # i.e. 2
...
X <- matrix(0, nrow = d1, ncol = d)
...
X <- X[o, ] # could put drop = FALSE here
I think you should post a bug with the author of the package.