Stacking multiple arrays into a matrix

21 vues (au cours des 30 derniers jours)
HEMRAJ PATEL
HEMRAJ PATEL le 13 Nov 2021
Commenté : HEMRAJ PATEL le 13 Nov 2021
How can i form a matrix out of n number of different column matrices of same size by placing them side by side.

Réponse acceptée

Dave B
Dave B le 13 Nov 2021
Modifié(e) : Dave B le 13 Nov 2021
You can make append two columns like this:
a=rand(10,1);
b=rand(10,1);
c=[a b];
size(c)
ans = 1×2
10 2
or like this:
c=cat(2,a,b);
size(c)
ans = 1×2
10 2
Both approaches extend to n columns:
a=rand(10,1);
b=rand(10,1);
c=rand(10,1);
d=rand(10,1);
M1=[a b c d];
size(M1)
ans = 1×2
10 4
M2=cat(2,a,b,c,d);
size(M2)
ans = 1×2
10 4
Alternatively, you could initialize a matrix and then fill it with the columns:
M3=nan(numel(a),4); % you don't really need to initialize, but it is wise
M3(:,1) = a;
M3(:,2) = b;
M3(:,3) = c;
M3(:,4) = d;
size(M3)
ans = 1×2
10 4
  6 commentaires
Stephen23
Stephen23 le 13 Nov 2021
"if i have 2000 matrices like (c1,c2,c3,...,c2000) and i want them in cat function. How will i do it."
I have some ideas of how you might do it, but no experienced MATLAB users would do that.
"Do i have to write c=cat(2,c1,c2,c3....) or do we have another option"
Another option is better data design: don't have numbered variable names.
Numbered variable names is a sign that you are doing something wrong. Use indexing instead.
HEMRAJ PATEL
HEMRAJ PATEL le 13 Nov 2021
Thanks for your valuable replies. I have solved my problem, i might have framed my question wrong.

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