Combine 3 array in one matrix of 3 columns

How can I combine these columns? I'm running this short program here:

clc
clear all
P(2)=2*sqrt(2);
for n=2:30
P(n+1)=2^n*sqrt(2*(1-sqrt(1-(P(n)/2^n)^2)));
errabs(n)=abs(pi-P(n));
end
P(31)=[];
Matrice=[2:30;P;errabs];
fprintf('%s %13s %31s\t \n','n','Pn','Erreur absolue');

But even if in the workspace I can see that they're all 30 columns long I can't concatenate them.

Can anyone help me on this one?

I ran this one this morning without any problems:

clc
fprintf('a)\n');
v=0;
for i=1:13
    v(i)=factorial(i);
end
fprintf('v=\t')
fprintf('%d\t',v);
%partie b)
fprintf('\n\nb)\n');
s_n=0;
for i=1:13
    s_n(i)=sqrt(2*pi*i)*(i/exp(1))^i;
end
fprintf('Lapproximation est de:\n');
fprintf('%f\t',s_n);
%c)
for i=1:13
errabs(i)=abs(v(i)-s_n(i));
errrel(i)=abs((v(i)-s_n(i))./v(i));
end
fprintf('\n\nb)\nLerreur absolue est de:\n');
fprintf('%f\t',errabs);
fprintf('\n');
fprintf('\nc)\nLerreur relative est de:\n');
fprintf('%f\t',errrel);
disp(' ');
disp(' ');
disp('d)');
Matrice=[1:13;errabs;errrel];
fprintf('\n%s  %20s\t\t    %20s','n','Erreur absolue','Erreur relative');
fprintf('\n %d\t %1.16e \t %1.16e\n\n \n',Matrice);

Answer 1

[Walter Roberson]

Matrice = [(2:30).', P(:); errabs(:)];

However, 2:30 is only 29 entries not 30, so you are going to have problems.

[Philippe Girard]

I don't really understand what you just corrected... And well is there a way to combine them or to solve this problem? I can do whatever as long as it's 3 columns.

[Stephen23]

"is there a way to combine them or to solve this problem"

Yes, using the (:) syntax that Walter Roberson showed you. Walter Roberson also told you why this will fail when you use it (because you have one column that is shorter than the others).