Matlab - MATLAB; sumar Filas y Columnas externas de una matriz

>> A=rand(5,8)

s=sum(A(1,:))+sum(A(end,:))+sum(A(:,1))+sum(A(:,end))

A =

    0.8147    0.0975    0.1576    0.1419    0.6557    0.7577    0.7060    0.8235

    0.9058    0.2785    0.9706    0.4218    0.0357    0.7431    0.0318    0.6948

    0.1270    0.5469    0.9572    0.9157    0.8491    0.3922    0.2769    0.3171

    0.9134    0.9575    0.4854    0.7922    0.9340    0.6555    0.0462    0.9502

    0.6324    0.9649    0.8003    0.9595    0.6787    0.1712    0.0971    0.0344

s =

   14.7066

S = sum(a(1,:)) + sum(a(end,:)) + sum(a(:,1))+sum(a(:,end))-(a(1,1) + a(end,1) + a(1,end)+a(end,end))

[n,m]=size(a);

if n==1 || m==1

    s=sum(a);

else

    s=sum(a(1,:)) + sum(a(end,:)) + sum(a(:,1))+sum(a(:,end))-(a(1,1) + a(end,1) + a(1,end)+a(end,end));

end