Compute Fraiman-Muniz depth

Uses the FM1 formula from fda.usc: d = 1 - |0.5 - Fn(x)| With scale=TRUE (default): d = (1 - |0.5 - Fn(x)| - 0.5) * 2 = 2 * min(Fn(x), 1-Fn(x))

Usage

depth_fm_1d(fdataobj, fdataori, `_trim`, scale)