How to change string name?

Question

Elzbieta Trynkiewicz 2019-1-12

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/439514-how-to-change-string-name

评论： Elzbieta Trynkiewicz 2019-1-13

采纳的回答： Stephen23

Hey!

I have a function e.g. y=a*x.

How can I change later string name of y to y306 or sth like that?

4 个评论
显示 2更早的评论隐藏 2更早的评论

Elzbieta Trynkiewicz 2019-1-13

Thank you for your comment but could you explain me more or help with following problem?

I created this question since I have such kind of problem: I tried to load multiple data which was previously saved like a 'y'; but all of these, despite the different external filename, they have the same name of "internal" variable and they are overwriting.

Stephen23 2019-1-13

"I tried to load multiple data which was previously saved like a 'y'; but all of these, despite the different external filename, they have the same name of "internal" variable and they are overwriting."

Aaah, that is an entirely different question to what you asked about: http://xyproblem.info/

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Stephen23 2019-1-13

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/439514-how-to-change-string-name#answer_356233

编辑：Stephen23 2019-1-13

The solution is to simply use indexing. For example, you could put all of your imported data into one cell array. You did not give much information in your question (e.g. the file format, what function you are using to import the data, the data class, whether you generate the name with sprintf or use dir to obtain the names of existing files, etc), so I will show an example that imports data from .mat files using load:

S = dir('*.mat');
N = numel(S);
C = cell(1,N); % preallocate.
for k = 1:N 
    C{k} = load(S(k).name);
end
A = [C{:}] % optional, create non-scalar structure.

Then all of the imported data will be available in the cell array C or (even better) the non-scalar structure A:

https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

If the loaded .mat files only contain one (or a few) variables that you need, you can easily access them inside the loop and put that data into on (or a few) array, e.g.:

S = dir('*.mat');
N = numel(S);
C = cell(1,N); % preallocate.
for k = 1:N 
    T = load(S(k).name);
    C{k} = T.y;
end

Feel free to adapt the class and size to suit your data: depending on your data you could import into a numeric/char/string array, with columns/rows to suit number of variables, etc..

You should read this too:

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html