matrix creation from a loop

1 次查看(过去 30 天)
Jonathan Demmer
Jonathan Demmer 2020-9-17
编辑: Ruger28 2020-9-17
Hello all,
I would like to create 60 vector columns of zeros (6964,1) called lat_01_days, lat_02days, lat_03_days until 60. I know I could write them one by one but if i know How to create a loop to create them it would be better also for future research. Can someone help mep lease?
regards
Jonathan
  2 个评论
Stephen23
Stephen23 2020-9-17
"I would like to create 60 vector columns of zeros (6964,1) called lat_01_days, lat_02days, lat_03_days until 60."
Numbering variables like that is a sign that you are doing something wrong.
Forcing meta-data (e.g. pseudo-indices) intoe variable names is a sign that you are doing something wrong.
"I know I could write them one by one ..."
Ouch!
"...but if i know How to create a loop to create them it would be better also for future research"
In fact what "would be better also for future research" is to avoid numbered variables entirely:

请先登录,再进行评论。

回答(3 个)

Walter Roberson
Walter Roberson 2020-9-17
if i know How to create a loop to create them it would be better also for future research.
Our long experience is that it would make your future research worse instead of better.

Stephen23
Stephen23 2020-9-17
The simplest and most efficient solution is to just create one matrix:
lat = zeros(6964,60)
which you can then trivially access using indexing. There is no point in making it more complex than that.

Ruger28
Ruger28 2020-9-17
编辑:Ruger28 2020-9-17
The two other answers are a more correct way of doing it. There is no need to create this many variables in your workspace. However, if you must...
You should use a structure instead of individual variables.
Blank_Vec = zeros(6964,1);
Num_Cols = 60;
for ii = 1:Num_Cols
name = sprintf('lat_%i_days',ii);
ZeroColStruct.(name) = Blank_Vec;
end
if you absolutely MUST have individual variables, one method is this:
% Removed due to being a terrible way to do something
  3 个评论
Jonathan Demmer
Jonathan Demmer 2020-9-17
I am kind of new i understand what everybody else is saying above and i will follow your guidelines. Thank you very much.
Jonathan Demmer
Jonathan Demmer 2020-9-17
Thank you Stephen for your advice.

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 Loops and Conditional Statements 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