Save each vector iteration into a matrix

Question

Abdur Rahim 2016-10-31

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/310046-save-each-vector-iteration-into-a-matrix

评论： Abdulramon Adeyiola 2022-3-4

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

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Answer 1

Cory Johnson 2016-11-1

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/310046-save-each-vector-iteration-into-a-matrix#answer_241510

在 MATLAB Online 中打开

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