Read multiple .mat files in the file path in sequence

6 visualizzazioni (ultimi 30 giorni)
Hi everyone,
There are 10 .mat files in the file path. I need to read the value of one matrix (called 'Scanning') in this file and keep it in another.
For instance ,
0_cm(1).mat , 0_cm(2).mat .... 0_cm(10).mat
I get the error when I write the following matlab code and filename is a string type, so I can't access files with the variable i.
Test = [];
for i=1:10
filename = "D:\matlab\0_cm(i).mat";
myVars = {'Scanning'};
S = load(filename,myVars{:});
Test = S.Scanning(:,64)
end
Thanks for your answer in advance.

Risposte (2)

dpb
dpb il 30 Ago 2019
for i=1:10
filename = sprintf('D:\matlab\0_cm(%d).mat',i); % build specific file name
myVars = {'Scanning'};
S = load(filename,myVars{:});
Test = S.Scanning(:,64)
end
  3 Commenti
Steven Lord
Steven Lord il 30 Ago 2019
You could also use string with the + operator.
n = 9;
filename = "D:\matlab\0_cm(" + n + ").mat";
You could use this with fullfile if you wanted.
n = 9;
FN = "0_cm(" + n + ").mat";
filename = fullfile('D:\', 'matlab', FN)
mehmet irfan gedik
mehmet irfan gedik il 30 Ago 2019
@dpb, yes an error is emerging as @Stephen Cobeldick mentions.
Warning: Escaped character '\m' is not valid. See 'doc sprintf' for supported special characters.
Thanks @Stephen Cobeldick,

Accedi per commentare.


mehmet irfan gedik
mehmet irfan gedik il 30 Ago 2019
Modificato: mehmet irfan gedik il 30 Ago 2019
Thanks @Steven Lord ,
We could actually solve the problem with a fairly simple method.
Edit : But I wonder why the sprintf function is causing such a problem ???.
  2 Commenti
David K.
David K. il 30 Ago 2019
The reason there is a problem is that when compiling sprintf into a string, the function uses the '\' as an escape character as stephen mentioned. What this means is the text interpreter will look at the next charactes expecting not text but some indicator for something else.
For example, if you want a tab in your string you can do '\t', or '\n' for a newline. Since the '\' is being used like that matlab puts in a way to keep it. typeing '\\' results in a single backslash in the string. So the code can be fixed using stephen's "escape the backslash" method as such
filename = sprintf('D:\\matlab\\0_cm(%d).mat',i);
mehmet irfan gedik
mehmet irfan gedik il 30 Ago 2019
@David K. , Thank you for your descriptive sentences.

Accedi per commentare.

Categorie

Scopri di più su Characters and Strings in Help Center e File Exchange

Prodotti

Community Treasure Hunt

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

Start Hunting!

Translated by