Save each vector iteration into a matrix

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Abdur Rahim
Abdur Rahim am 31 Okt. 2016
I have 2 vectors, a and b and the sum of both is v.The time t ranges from 0 to 20 and i would like to save each iteration of v (a vector) into a matrix (where there are 21 vectors thus 3x21). Currently this code goes through each iteration however overwrites all of them and only shows the last value of t. Im am also unsure where the 'if' command is suitable in this circumstance.
for t=1:20;
a = [t,cos(t),0]';
b = [0,0,sin(t)]';
v = a + b;
end

Akzeptierte Antwort

Cory Johnson
Cory Johnson am 1 Nov. 2016
There are lots of ways to organize data in MATLAB. Below I have shown 3 ways to do this. I think you're looking for the last method.
%%Cell Array
for t=0:20;
a{t+1} = [t,cos(t),0]';
b{t+1} = [0,0,sin(t)]';
v{t+1} = a{t+1} + b{t+1};
end
%%Structure array
for t=0:20;
vec(t+1).a = [t,cos(t),0]';
vec(t+1).b = [0,0,sin(t)]';
vec(t+1).v = vec(t+1).a + vec(t+1).b;
end
%%Only save v
v = [];
for t=0:20;
a = [t,cos(t),0]';
b = [0,0,sin(t)]';
v = [v, (a + b)];
end
Hope that helps!
  2 Kommentare
Abdur Rahim
Abdur Rahim am 1 Nov. 2016
It's greats having all those methods because I can use the format for future codes, its helped me a lot thanks.
Abdulramon Adeyiola
Abdulramon Adeyiola am 4 Mär. 2022
Thanks for this. Meanwhile, what if the dimension of the two vectors are not the same?

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