Clean up index notation

Author: IsakFalk

src/approximations/nystrom.jl

@@ -11,7 +11,7 @@ end
 
 function nystrom_sample(k::Kernel, X::AbstractMatrix, S::Vector{<:Integer}; obsdim::Integer=defaultobs)
     obsdim ∈ [1, 2] || throw(ArgumentError("`obsdim` should be 1 or 2 (see docs of kernelmatrix))"))
-    Xₘ = obsdim == 1 ? getindex(X, S, :) : getindex(X, :, S)
+    Xₘ = obsdim == 1 ? X[S, :] : X[:, S]
     C = k(Xₘ, X; obsdim=obsdim)
     Cs = getindex(C, :, S)
     return (C, Cs)