How to make column vector from existing column vector

I have a data file of tensile force, time and displacement. I would like to create a new vector of a defined amount of elements from the existing values. For example, If from the first plot of stress v strain I identify that the yeild point is at near the 1000th element I want to create a new column vector Stress_zoomed that would contain elements 1 to 1000. Can anyone tell me how I do this? For context I need to do this because at some point I will integrate the value of just the elastic portion of my values.

Attached is the code I have so far.

clear;clc;

T = readtable('s3g2_tensile_test_1.csv','NumHeaderLines',9);

Time= table2array(T(:,1));

Force= table2array(T(:,2));

Displacement= table2array(T(:,3));

Optical= table2array(T(:,4));

Mechanical= table2array(T(:,5));

Wo=.509

wf=.509;

to=.482;

tf=.480;

Lo=2.498;

Lf=2.551;

G=1.016;

Ao=Wo*to;

Af=wf*tf;

A_delta=.0529;

Stress=Force/Ao;

Strain=((Lo+Optical)-Lo)/Lo;

plot(Strain, Stress)

[Dyuman Joshi]

Simple indexing should do -

%Let yP be the element that is the nearest to the yield point
Stress_zoomed = stress(1:yP)

Answer 1

[Star Strider]

Perhaps create a second table.

Tzoomed = T(1:1000,:)

Then refer to it as you would the original ‘T’ with respect to its variables.