Finding the minima or maxima point on a graph

Hi, Hope someone can help.

I have a line graph and i want to fin the minima or maxima point, is there a simple finction i can use to the do this?

Answer 1

[KALYAN ACHARJYA]

You can find local min islocalmin (first return array)

or

#Example

x=1:100;
c=2;
m=3;
y=m*x+c;  
data1=find(y==min(y)); %index of minimum
data2=find(y==max(y)); %index of maximum

Is this?

[jack Hardy]

what do you mean by "first and last return of array"?