Print or display a group of numbers contained in a vector with loops

Question

Nat 2022-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/1784485-print-or-display-a-group-of-numbers-contained-in-a-vector-with-loops

评论： Nat 2022-8-24

采纳的回答： KSSV

在 MATLAB Online 中打开

Hi everyone,

I arranged a vector of 15 elements in total and I am asked to print the numbers in groups of 3.

a=[2 4 3 5 9 8 2 1 0 2 3 4 7 8 9];

For example, the first print would only print the first three numbers in that vector, then print the next three numbers again, and so on. Let's say: 2 4 3, then 5 9 8 and so on. Of course, I do understand I need to loop my program so it can print five groups (15 elements/3).

Maybe I don't have much experience and my logic understands the following code:

cont=1;
for i=1:length(a)/5
    disp(a(cont))
    cont=cont+3;
end
     2

     5

     2

I failed since it's only printing the numeric value every three results (2 5 2 2 7) and it doesn't print the groups of numbers. I know that this should be done with a single for but I don't understand how I can organize the information.

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Answer 1

KSSV 2022-8-24

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https://ww2.mathworks.cn/matlabcentral/answers/1784485-print-or-display-a-group-of-numbers-contained-in-a-vector-with-loops#answer_1031680

编辑：KSSV 2022-8-24

在 MATLAB Online 中打开

REad about reshape

a = [2 4 3 5 9 8 2 1 0 2 3 4 7 8 9];
b = reshape(a,3,[])'
B = 5×3
     2     4     3
     5     9     8
     2     1     0
     2     3     4
     7     8     9

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KSSV 2022-8-24

在 MATLAB Online 中打开

a = [2 4 3 5 9 8 2 1 0 2 3 4 7 8 9];
idx = 0:3:length(a) ;
for i = 2:length(idx)
    a(idx(i-1)+1:idx(i))
end
ans = 1×3
     2     4     3
ans = 1×3
     5     9     8
ans = 1×3
     2     1     0
ans = 1×3
     2     3     4
ans = 1×3
     7     8     9