Elementwise division in matrix notation

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Hylke Dijkstra
Hylke Dijkstra 2022 年 1 月 28 日
コメント済み: Image Analyst 2022 年 1 月 28 日
Dear all,
I am trying to write the following code in matrix notation:
A = B. / C;
A, B and C are column vectors with 1435 rows.
I have already managed to do this with multiplication, i.e.:
D = E.*F;
This is equivalent to
D = diag(F)*E;
Also in this case D, E and F are also column vectors with 1435 rows.
I want to do this because it is more foolproof and does not give results if the dimensions do not match.
Best,
Hylke
  6 件のコメント
Hylke Dijkstra
Hylke Dijkstra 2022 年 1 月 28 日
This page does not seem to exist.. Thanks though, it would be helpful.

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採用された回答

Torsten
Torsten 2022 年 1 月 28 日
Backslash \ , not divide /.
  1 件のコメント
Hylke Dijkstra
Hylke Dijkstra 2022 年 1 月 28 日
Oh dear, you're a savior.

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その他の回答 (1 件)

Image Analyst
Image Analyst 2022 年 1 月 28 日
編集済み: Image Analyst 2022 年 1 月 28 日
Try getting rid of the space between the dot and the slash:
A = B ./ C;
If the length of B and C don't match, you might want to consider if you even want to divide them. Like, WHY don't they match? If one is shorter to you want to just assign the "left over" elements to something specific, like 0 or 1 or B or C or something?
  4 件のコメント
Image Analyst
Image Analyst 2022 年 1 月 28 日
Not using diag() will also give an error. Look:
B = rand(10, 1);
C = rand(2, 1);
A = B ./ C;
Arrays have incompatible sizes for this operation.

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