MATLAB: How to assign a large multi-demensional matrix fast by index and another matrix

Question

here is my situation

Nx=400; Ny=500; Nz=300; Nm=50; Np=10;
mtx =  zeros(Nx,Ny,Nz,Nm,Np);
for idx = 1:length(Ny_list)
     mtx(:,Ny_list(idx),Nz_list(idx),Nm_list(idx),Np_list(idx))=linedata(idx,:);%linedata is the acquired data, size(linedata) is 100,000×400
     %Ny_list,Nz_list,Nm_list,Np_list are 100,000×1 vectors indicating the indexes
end

And is ultra-slow

How can i speed the matrix assignment?

Thanks!

Answer 1

Indices = sub2ind([Ny,Nz,Nm,Np],Ny_list,Nz_list,Nm_list,Np_list);
mtx =  zeros(Nx,Ny,Nz,Nm,Np);
mtx(:,Indices)=linedata(1:numel(Indices),:).';