http://www.mathworks.de/matlabcentral/answers/54646-how-to-produce-interval-from-this-matrix

k=[1,2,3,4,5,6,7]
w=8;
x=2; 
a=0.2 ; 
w=(0:0.3:3)
S=cell2mat(arrayfun(@(k) 1-exp(-a*x*k.*w),k','un',0))
close
plot(w,S,'-+');
xlabel('w');
ylabel('S');




7 Commen

diff(A(:,2:end),1,2)./diff(A(:,1:end-1),1,2)

or:

temp=diff(A,1,2);
out=temp(:,2:end)./temp(:,1:end-1);