I got error in this script

clear,clc,close all
datas = readtable('time_vs_load.xlsx','Sheet',2,'NumHeaderLines',1);
time = datas(:,1);
load = datas(:,2);
h = mean(diff(time));
n = length(load);

Error using tabular/length
Undefined function 'LENGTH' for input arguments of type 'table'. Use the height, width, or size functions instead.

% Peak Loading Rate Using Central Difference formula
peak_l_r =(-3*load(1) + 4*load(2) - load(3))/(2*h);
for i = 2:n-1
    peak_l_r = (load(i+1)-load(i-1))/(2*h);
end
peak_l_r = (load(n-2)-4*load(n-2) + 3*load(n))/(2*h);
peak_l_r = max(peak_l_r)
pear_loading_rate = peak_l_r
% Impulse during the entire timeseries using Trapezoidal methods

impulse = trapz(time,load)
% Results
disp(['Peak loading rate: ', num2str(peak_loading_rate)]);
disp(['Impulse: ', num2str(impulse)]);

Answer 1

[the cyclist]

The line

time = datas(:,1);

will give a table with one variable. You need to use curly brackets in access the contents of the table column.

time = datas{:,1};

This code works (after I fixed the typo "pear_loading_rate"):

clear,clc,close all
datas = readtable('time_vs_load.xlsx','Sheet',2,'NumHeaderLines',1);
time = datas{:,1};
load = datas{:,2};
h = mean(diff(time));
n = length(load);
% Peak Loading Rate Using Central Difference formula
peak_l_r =(-3*load(1) + 4*load(2) - load(3))/(2*h);
for i = 2:n-1
    peak_l_r = (load(i+1)-load(i-1))/(2*h);
end
peak_l_r = (load(n-2)-4*load(n-2) + 3*load(n))/(2*h);
peak_l_r = max(peak_l_r)

peak_l_r = -1.6280e+04

peak_loading_rate = peak_l_r

peak_loading_rate = -1.6280e+04

% Impulse during the entire timeseries using Trapezoidal methods

impulse = trapz(time,load)

impulse = 884.2424

% Results
disp(['Peak loading rate: ', num2str(peak_loading_rate)]);

Peak loading rate: -16280.0583

disp(['Impulse: ', num2str(impulse)]);

Impulse: 884.2424

[NANDEESWARAN]

Thanks sir. I appreciate your help