How to repeat the same function for different matrix ?

19 次查看（过去 30 天）
Rachel Sabioni
Rachel Sabioni 2019-3-20
评论： Rachel Sabioni 2019-3-20
Hello,
I have many vectors with different row sizes and I would like to repeat the same function for them.
Example:
A1 = [8; 9; 10]
A2 = [1; 2]
B1 = [0.1; 0.3; 0.6]
B2 = [0.5; 0.9]
P1 = A1 .* B1
P2 = A2 .* B2
...
How could I do to solve that?
Thanks in advance,
  5 个评论
显示 3更早的评论
Luna
Luna 2019-3-20
编辑：Luna 2019-3-20
Do you want to get each P for each A and B seperately? or the P will be a long vector?
Also your vectors in your workspace or defined in a variable? Simply you can do this:
vectorA = [A1;A2; .. bla bla .. An];
vectorB = [B1;B2; .. bla bla .. Bn];
vectorP = vectorA .* vectorB;
Stephen23
Stephen23 2019-3-20
编辑：Stephen23 2019-3-20
"But I want to do that for many vectors A (A1, A2, A3, ...) and vectors B(B1, B2, B3, ...)"
Numbered variables are a sign that you are doing something wrong.
Dynamically accessing badly named variables is one way that beginners force themselves into writing slow, complex, obfuscated, buggy code that is hard to debug. Read this to know why:
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval
"How to repeat the same function for different matrix ?"
This is trivial using idnexing.
Indexing is simple, neat, compact, easy to debug, and very efficient (unlike what you are trying to do). You should use indexing, just like experienced MATLAB users do.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

YUNUS AKSOY
YUNUS AKSOY 2019-3-20
for c=1:2;
eval(['P',num2str(c),'=A',num2str(c),'.*B',num2str(c),';']);
end
  3 个评论
显示 1更早的评论
Stephen23
Stephen23 2019-3-20
编辑：Stephen23 2019-3-20
Note that the MATLAB documentation specifically recommends avoiding doing this:
https://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html
Dynamically accessing badly named variables is one way that beginners force themselves into writing slow, complex, obfuscated, buggy code that is hard to debug. Read this to know why:
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval
Indexing is simple, neat, compact, easy to debug, and very efficient (unlike what you recommend). Experienced MATLAB users recommend indexing, you can too.
Rachel Sabioni
Rachel Sabioni 2019-3-20
Thank you all for your help and explanations. I am a beginner in MATLAB and yours comments have helped me a lot !!

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Whos 的更多信息

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by