## what is the function of this iteration

### uncung fgv (view profile)

on 22 Nov 2012
the figure on this link. http://salotungo.blogspot.de/
it is better we see it directly.
i want thelast data is n1 n2 n3 n4 so i can make plot directly. recently i did it manually one by one.
thx

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uncung fgv

### uncung fgv (view profile)

on 23 Nov 2012
n1,2,3 I mean the last calculation of (y3-y2)/(y2-y1)=n1;
(y4-y3)/(y3-y2)=n2;
and soon n3..7
i did it manually:
by calculating:
every difference of y1..7
and devide them also one another, one by one from plot to plot.
is there any simple function to calculate n1..7?
thx.
Daniel Shub

### Daniel Shub (view profile)

on 23 Nov 2012
I am closing this question until the OP adds details.
uncung fgv

### uncung fgv (view profile)

on 23 Nov 2012
the detail:
my problem is its iteration. manually it is ok. but i have many plots ánd datas.
i have a figure that have many plots within.
i want:
(y3-y2)/(y2-y1)=n1
(y4-y3)/(y3-y2)=n2
(y5-y4)/(y4-y3)=n3
(y6-y5)/(y5-y4)=n4
and soon until n7
the function of the figure is
w=8;
x=2;
a=0.2;
w=(0:0.3:3);
k=1; 1, 2,3,4,5,6,7 ; variable change
S=[1-exp(-a.*x.*k.*w)];
figure(1)
plot(w,S,'-+');
xlabel('w');
ylabel('S');
hold on
if we run this with k= 1, 2,3,4,5,6,7 we will find plots at one figure. and i want to calculate n1..n7 as above.