Get the filename of a loaded file

56 次查看(过去 30 天)
Hi,
I have a script that loads a file and do some data plotting. I am loading different files each time I run the script. I manually edit the file name since every time the name is different and comming from an unrelated system.
My script reads the file as follows:
load('\Data_record_file_20220714T121615.mat');
Question:
How can I register the file name in a variable? I want to later use the file name in a string (after trimming it) so that I can automatically include the file name on the plot title.
Thank you.
Fabián

采纳的回答

Star Strider
Star Strider 2022-8-3
Save the fille name as a string or character array first, then refer to it as any other variable —
filename = '\Data_record_file_20220714T121615.mat';
load(filename);
One option might be to store all the various file names in a cell array or string array, and then just subscript into it —
load_data = load(filecell{k});
where ‘k’ is the desired element of the cell array ‘filecell’ storing the file names.
It is always best to load into a structure output. This avoids problems such as overwriting existing variables, and other potential problems —
load_data = load(filename);
then refer to the fields of ‘load_data’ (or whatever you choose to call it) to recover the various variables.
.
  4 个评论
Walter Roberson
Walter Roberson 2022-8-3
The file name is not returned when you load(). The only way to find it after the fact is to use dbstack() to locate the file name and line of code that you just executed, and then parse the matlab source for the routine that calls load() and read the quoted string from the source code.
If you have a red box of nails and a blue box of nails and you pull a nail out of one of the boxes, then you know that it is unlikely that the nail will have inscribed on it "This came from the blue box". MAT files are containers, and the loaded data does not get labeled with file name.

请先登录,再进行评论。

更多回答(2 个)

桂生 李
桂生 李 2022-8-3
try
[FileName, FilePath] = uigetfile;

Walter Roberson
Walter Roberson 2022-8-3
filename = '\Data_record_file_20220714T121615.mat';
load(filename);
[~, basename, ~] = fileparts(filename);
title( "Analysis of " + basename)
Note: we do not recommend that form of load(). We recommend that you assign the output of load() to a variable, which gives you a struct array with one field for each loaded variable; you would then pull fields out of the struct as needed. This is more robust and more efficient, and is needed if you later want to do code generation. There are situations in which MATLAB will ignore variables created by load() that does not have an output variable name.
  3 个评论
Walter Roberson
Walter Roberson 2022-8-3
load(filename); is not recommended. load_data = load(filename); is recommended instead.

请先登录,再进行评论。

类别

Help CenterFile Exchange 中查找有关 Sources 的更多信息

产品


版本

R2020b

Community Treasure Hunt

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

Start Hunting!

Translated by