How to find exact function and minimum values in interpolated datasets

Question

Jang 2012-12-10

assume that i have some matrix like

a=[1,2,3,4,5,6,7,8,9,10,11]

E=[2,4,6,8,10,12,14,16,18,20,22]

how can i find the exact function data like E=2*a ???

and i want to find the minimum value(local or anything)

in interpolated function...

x=cOverawithsameV(:,1); y=EV(:,1); xx=linspace(min(x),max(x),1000); fun1=spline(x,y,xx); fminsearch(fun1,min(y))

this doesn't work since the fun1 is not a function...

what should i do to find the local minimum values in this interpolated datasets..?

the function has a parabolic shape

Answer 1

Matt J 2012-12-10

     fun1=@(z) spline(x,y,z);
     fminsearch(fun1,min(y))

Jang 2012-12-11

this doesn't works

Matt J 2012-12-11

Then why did you accept it?

My guess (that's all we can do without more info about "doesn't work") is that you're not initializing fminsearch where you need to:

fun1=@(z) spline(x,y,z);
[minval,idx]=min(y);
fminsearch(fun1,x(idx(1)));