MATLAB: How to asign columns of a matrix to different matrixes

Hi I would like to a large data matrix in different matrices. The data matrix is a 4 * 85932 (558*154) matrix where I want to asign each column to a different new matrix with the dimension of (558*154) and save it to the workspace. I tried to write following function to achieve that and than to run it from the command window. I only get a output in the command window but the matrices are not saved in the workspace.

Function

function [x, y, z, Vx, Vy] = matrix_generation(data)
%MATRIX_GENERATION returns the x, , z, Vx, vy as 558*154 matrixes
%   splits each collum in 154 columns with each has 558 data
%   the data matrix has 5 columns
    for i= 1:5
        q = zeros(558,154);
        %   each column has 154*558 rows
        for j=1:154
            for a = 1:558
                q(a,j) = data(j*a,i);
            end
        end
        if (i ==1)
            x = q;
        elseif (i ==2)
            y = q;
        elseif (i ==3)
            z = q;
        elseif (i ==4)
            Vx = q;
        else
            Vy = q;
        
        end
    end
end

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