why im getting error in table and i have 2013 version.

clc;
clear all;
close all;
%% First Part 
h=0.01; %given
%initial Value Given
y(1)=2;
t=0:h:1;
%diff_fun=1+t-y-t*y;
%% Coefficients from Butcher array
c1=0;
c2=1/2;
c3=1;
b1=1/6;
b2=2/3;
b3=1/6;
a21=1/2;
a31=-1;
a32=2;
%% Genral Form of Raltson Method
%y(n+1)=y(n)+b1*k1+b2*k2+b3*k3
% k1=h*f(t1,y1)
% k2=h*f(t1+c2*h,y1+a21*k1)
% k3=h*f(t1+c3*h,y1+a31*k1+a32*k2)

for i=2:length(t)
   k1=h*(1+t(i-1)-y(i-1)-t(i-1)*y(i-1));
   k2=h*(1+(t(i-1)+c2*h)-(y(i-1)+a21*k1)-(t(i-1)+c2*h)*(y(i-1)+a21*k1));
   k3=h*(1+(t(i-1)+c3*h)-(y(i-1)+a31*k1+a32*k2)-(t(i-1)+c3*h)*(y(i-1)+a31*k1+a32*k2));
   y(i)=y(i-1)+b1*k1+b2*k2+b3*k3;
end
%To Create Table and relative error
t_data=[0.2,0.4,0.6,0.8,1];
y_exact=(1+exp(-t_data-(t_data.^2)/2));
[tf,idx]=ismember(t_data,t);
Approx_Value=(y(idx));
Raltive_Error=(((y_exact-Approx_Value)./y_exact))';
y_exact=(1+exp(-t_data-(t_data.^2)/2))';
SlNo=[1:5]';
Approx_Value=(y(idx))';
t_data=[0.2,0.4,0.6,0.8,1]';
T=table(SlNo,t_data,y_exact,Approx_Value,Raltive_Error)
%% Done 

[Adam Danz]

What's the full copy-pasted error message and which line is producing the error?

Have you cleared your workspace and run the code from your question? It does not produce an error.

[emre ozbek]

In this line

T=table(SlNo,t_data,y_exact,Approx_Value,Raltive_Error)

[Adam Danz]

That answers 1/2 of my first question.

[Armin Mashhadi]

No error found on matlab R2018b

[Walter Roberson]

table() was added in R2013b . Perhaps you have R2013a ?

[emre ozbek]

Yes i have 2013a version

[Adam Danz]

In that case, you can work with a cell array instead of a table.

T={SlNo,t_data,y_exact,Approx_Value,Raltive_Error}

assuming each variable is a column of equal length.

If the variables are all numeric, a matrix may be better

T=[SlNo,t_data,y_exact,Approx_Value,Raltive_Error]

[Walter Roberson]

Also if you have Statistics toolbox you might be able to use dataset()