How to perform arithmetic operation that would affect all variables in a folder at once

2 次查看（过去 30 天）

Ayobami Meadows 2021-12-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1618475-how-to-perform-arithmetic-operation-that-would-affect-all-variables-in-a-folder-at-once

评论： Ayobami Meadows 2022-1-2

There are 5 variables in a folder (crate1, crate2, crate3, crate4, crate5). Each of these variables have 3 sub-variables inside them. The 3 sub-variables have same names but different values, for all the variables. For example, crate1 has month, time, date. Crate2 also has month, time, date. And so on up to crate5... The task needed is to divide sub-variables (only month and time) by 0.5, for all the variables crate1 to crate5... Instead of doing it manually one after other, is there a way I could do for all at same time?

7 个评论
显示 5更早的评论隐藏 5更早的评论

Stephen23 2021-12-29

"The task needed is to divide sub-variables (only month and time) by 0.5..."

Multiplying by two is probably clearer.

Ayobami Meadows 2021-12-29

Truly correct. But also understand that these are not the actual values of the task. I just create these samples to clearly demonstrate what I need to fulfill the main task with the original values.

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Matt J 2021-12-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1618475-how-to-perform-arithmetic-operation-that-would-affect-all-variables-in-a-folder-at-once#answer_863340

编辑：Matt J 2021-12-28

在 MATLAB Online 中打开

For scalar variables,

S=dir('crate*.mat');
month = arrayfun(@(s) load(s.name).month, S)/0.5;
time = arrayfun(@(s) load(s.name).time, S)/0.5;

EDIT: For non-scalar variables,

S=dir('crate*.mat');
month = cell2mat( arrayfun(@(s) load(s.name).month, S','uni',0) )/0.5;
time = cell2mat(arrayfun(@(s) load(s.name).time, S','uni',0) )/0.5;