You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: l2cinvx.m
    path of file: ./repos/2D_3D_PolarFourierTransform/MATLAB CodeBase/BTTBSystemsStudy
    
    the code of the file until where you have to start completion: function [ y ] = l2cinvx( ev,d )

%L2CINVX solves the preconditioning system Cy = d with BCCB preconditioner
% ev: the matrix generated by genl2ev.m, see A. 17;
% d : the right hand side vector; 
% y : the output solution

    
function [ y ] = l2cinvx( ev,d )

%L2CINVX solves the preconditioning system Cy = d with BCCB preconditioner
% ev: the matrix generated by genl2ev.m, see A. 17;
% d : the right hand side vector; 
% y : the output solution


[n,m] = size (ev);
rex = reshape (d,n,m);
rex = fft2(rex);
rex =  rex./ ev;
rex = ifft2(rex);
y = reshape (rex, m*n,1);
end