how convert the vector to matrix ? unknown number of columns
7 visualizzazioni (ultimi 30 giorni)
Mostra commenti meno recenti
Is it possible to convert the vector to matrix .unknown number of columns and the number of row is known. Where is the row filled with zeros? Or with holes?
A=[1 2 3 4 5 6 7 8 9]
number of row=3
A=[1 2 3 4
5 6 7 8
9 0 0 0]
1 Commento
Matt J
il 31 Lug 2021
Modificato: Matt J
il 31 Lug 2021
The task is ambiguous without additional specifications on how the number of columns is to be chosen. For example, with the input,
A=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15];
nrows=3;
there are at least three possible 3-row arrangements that would be valid:
B=[1 2 3 4 5
6 7 8 9 10
11 12 13 14 15]
B=[1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 0 0 0]
B=[1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 0 0 0 0 0 0]
Risposte (2)
dpb
il 29 Lug 2021
A=1:9;
nRow-3;
>> A=reshape(A,3,[])
A =
1 4 7
2 5 8
3 6 9
>>
The posted in the Q? text above forced four columns, not three (3) rows...
That, of course, is also doable with a little more effort...
A=1:9;
nCol=4;
nZ=ceil(numel(A)/4);
>> reshape([A zeros(1,nCol*nZ-numel(A))],nCol,[]).'
ans =
1 2 3 4
5 6 7 8
9 0 0 0
>>
6 Commenti
Matt J
il 31 Lug 2021
Modificato: Matt J
il 31 Lug 2021
@dpb yes, but augment to what? There isn't a unique choice.For the following input, for example,
A=[1 2 3 4 5 6 7 8 9 10 11 12 13 14 15]
there are at least three possible solutions with 3 rows:
B=[1 2 3 4 5
6 7 8 9 10
11 12 13 14 15]
B=[1 2 3 4 5 6
7 8 9 10 11 12
13 14 15 0 0 0]
B=[1 2 3 4 5 6 7
8 9 10 11 12 13 14
15 0 0 0 0 0 0]
Image Analyst
il 31 Lug 2021
@Matt J, yes there are multiple possible answers. But since he did not actually ask how to construct any of them, and all he asked was "Is it possible to convert the vector to matrix .unknown number of columns and the number of row is known?" the answer is simply "Yes".
Matt J
il 29 Lug 2021
No, the solution is ill-defined. Another result with the same number of rows is:
A=[1 2 3
4 5 6
7 8 9]
0 Commenti
Vedere anche
Categorie
Scopri di più su Logical in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!