pick elements from an array

I am having a array like

a=0:.1:10;

if I want to extract the elements from .5 to 0.8 to a new array how to do it?

I tried with find matlab command but it is giving only the ffirst elemnet 0.5 in the new array. but I need from 0.5 to 0.8

Kindly help in this regard

Answer 1

[Bhaskar R]

new_a = a(a>=0.5 & a<=0.8);

[guru k]

Thank you. But my case is like this

x=[1:0.1:100];

y=x^2;

in this case if I need only certain data x and y range from x= .5 to x=0.8 and plot those x and y how to do?

I need array data of x and y for the range using index

kindly help in this regard

[Bhaskar R]

y = x(x>=0.5 & x<=0.8).^2;  

You are starting from 1 to 100 with 0.1 diff, it obviuos that output is empty