Add another column to the right end of this array

This a code within the book of Cengels' Differential Equations. I would like to add a column with the value exact (1.5) at the right side at the end of the array.

lower=0;upper=1;

m=1;

exact=1.5;

f=@(x)7*x-6*x^2;

for nstrip=[1,2,3,4,5,10:10:50,100,200]

h=(upper-lower)/nstrip;

x=lower;value=0;

for n=1:nstrip

value=value+h*(f(x)+f(x+h))/2;

x=x+h;

error(m,:)=[nstrip,value,100*abs(value-exact)/exact];

end

m=m+1;

end

error

This is what I obtain:

I would like to obtain this

thanks for your help

Answer 1

[James Tursa]

your_matrix(:,end+1) = 1.5;

[Jose Ceballos]

Thanks for your response.

Where should I put it? I have tried but I dont know where to insert that command...

[James Tursa]

After you build the matrix, put this line afterwards using the actual name of your matrix instead of 'your_matrix' as I have listed.

[Torsten]

lower=0;upper=1;
m=1;
exact=1.5;
f=@(x)7*x-6*x^2;
Nstrip=[1,2,3,4,5,10:10:50,100,200];
my_results = zeros(numel(Nstrip),4);
for nstrip=Nstrip
    h=(upper-lower)/nstrip;
    x=lower;value=0; 
    for n=1:nstrip
        value=value+h*(f(x)+f(x+h))/2;
        x=x+h; 
    end
    my_results(m,:) = [nstrip,value,100*abs((value-exact)/exact),exact];
    m=m+1;
end
my_results

my_results = 12×4

1.0000 0.5000 66.6667 1.5000 2.0000 1.2500 16.6667 1.5000 3.0000 1.3889 7.4074 1.5000 4.0000 1.4375 4.1667 1.5000 5.0000 1.4600 2.6667 1.5000 10.0000 1.4900 0.6667 1.5000 20.0000 1.4975 0.1667 1.5000 30.0000 1.4989 0.0741 1.5000 40.0000 1.4994 0.0417 1.5000 50.0000 1.4996 0.0267 1.5000

[Jose Ceballos]

thank you very much for your help.....i appreciate it