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How to concatenate matrices when some of them can be empty?

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I have 10 matrices, each of them would either have a size of n by 12, or is empty. For example: T1 can be a matrix with a size of 100 x 12, but it can also be []. The same thing goes true for T2, ... T10.
What is the best way to put them together like the below?
vertcat(T1, T2, T3, ... T10)
Many thanks!

Risposta accettata

Image Analyst
Image Analyst il 15 Dic 2021
I'd do it almost like you. This works fine and has 9 rows because T7 is empty.
T1 = rand(1, 12);
T2 = rand(1, 12);
T3 = rand(1, 12);
T4 = rand(1, 12);
T5 = rand(1, 12);
T6 = rand(1, 12);
T7 = [];
T8 = rand(1, 12);
T9 = rand(1, 12);
T10 = rand(1, 12);
tallerMatrix = vertcat(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10)

Più risposte (1)

Voss il 15 Dic 2021
make the empty matrices 0-by-12, then you can vertcat them like normal.
if isempty(T2)
T2 = zeros(0,12);
% and so on
  3 Commenti
Edric Ellis
Edric Ellis il 15 Dic 2021
zeros(0,12) generates an empty matrix with the right number of columns. When you vertcat this, it disappears. Like this:
T1 = rand(1, 4);
T2 = zeros(0, 4);
T3 = 10 + rand(1, 4);
vertcat(T1, T2, T3)
ans = 2×4
0.0375 0.3622 0.0174 0.9187 10.5569 10.8928 10.4045 10.8303
Making the right number of columns is not strictly necessary in this case, since vertcat knows how to ignore [] which is of size [0 0].
Leon il 15 Dic 2021
Many thanks!
Interesting to hear the behavior of zeros when vertcating.

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