# How can I concatenate unknown numbers of row vectors?

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ziad tarek on 16 Dec 2020
Answered: Walter Roberson on 16 Dec 2020
if I have 3 (row vectors) for examble: A , B ,C
then I can do that
X=[A B C];
but, in my program : user will determine the number of (row vectors)
so in my case I want to do something like that:
X=[a(1),a(2),a(3),.....a(n)]
which a(1) .....a(n) is row vectors
how can I do that?
if any one understand signals
this is code (but he does not work )
I want something like that
t1=linspace(-1,1,2000);
q{1}=4*cos(2*pi*t1/4);
t2=linspace(1,3,2000);
q{2}=3.*t2-5;
t3=linspace(3,5,2000);
q{3}=.5.*t3.^2-4;
t4=linspace(5,7,2000);
q{4}=4*exp(-0.5*t4);
t=linspace(-3,7,10000);
.
.
.
.
q{n}=4*exp(2*tn);
%I want (loop for example) to Generate something like the next line:
y=[q{1} q{2} q{3} q{4} .. .. q{n}]

Ameer Hamza on 16 Dec 2020
You don't need a for-loop. For example
t1=linspace(-1,1,2000);
q{1}=4*cos(2*pi*t1/4);
t2=linspace(1,3,2000);
q{2}=3.*t2-5;
t3=linspace(3,5,2000);
q{3}=.5.*t3.^2-4;
t4=linspace(5,7,2000);
q{4}=4*exp(-0.5*t4);
q_all = [q{:}]; % [1x8000] vector

Walter Roberson on 16 Dec 2020