function [ outmat ] = reshape3Dto2Dalong3( inmat )
%RESHAPE3DTO2DALONG3 Summary of this function goes here
%   Detailed explanation goes here

% A(:,:,1)=[1:5;6:10;11:15;16:20];
% A(:,:,2)=[21:25;26:30;31:35;36:40];
% A(:,:,3)=[41:45;46:50;51:55;56:60];
% inmat=A;

[l1,l2,l3]=size(inmat);

outmat=reshape(permute(inmat,[1,3,2]),l1*l3,l2);

end