MATLAB: Fetching x axis Data values and corresponding y data value

Question

I have some data in the form

x = [1×72] a matrix which is x axis of the data

y = [1×72] a matrix which is y axis of the data

I am using following code

index = find(x>4 & x<5.1) %to fetch all those x axis data points having values between 4 and 5.1

Which gives me all those columbs numbers having values between 4 and 5.1

But I want the Data i.e. "x" not the columb number. What should I do?

I also want to get the corresponding values of "y" at all those selected x point.

Thanks in advance.

Answer 1

To get the y values correspeonding to x:

idx = x >4 & x<5.1 ;
x1 = x(idx) ; 
y1 = x(index) ;
% To get others 
x2 = x(~idx) ;
y2 = y(~idx) ;