readmatrix error: "filename" must be a string scalar or character vector.

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Andika Asyuda
Andika Asyuda 2023-4-17
编辑： Stephen23 2023-4-17
Hi,
I am trying to run a code to import and analyze all .txt file in folder 0p0001nM. There should be 5 of them, and each one contains 4 columns of data. My goal is the following:
  1. extract the third column of each file
  2. Apply certain operation to the third column of files(identical operation between files)
  3. Creating a matrice, which contain all 5 columns
The code is shown below. Apparently, I failed to import any data from .txt file. The errormessage is the followng:
-------------------------------------------------
Error using readmatrix (line 158)
"filename" must be a string scalar or character vector.
Error in cvHistamine (line 5)
S(k).data=readmatrix(F);
----------------------------------------------------
Can anyone help to solve this problem ?
Andika
---------------------------------------------------------------------------------------------------------------------------------------
P='C:\Users\aasyuda\Documents\CV-EIS\aptamer-histamin\14April2023\14April2023\0p0001nM';
S=dir(fullfile(P,'*.txt'));
for k=1:numel(S)
F=dir(fullfile(P,S(k).name));
S(k).data=readmatrix(F);
end

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回答（1 个）

Stephen23
Stephen23 2023-4-17
编辑：Stephen23 2023-4-17
Get rid of DIR from inside the loop.
P = 'C:\Users\aasyuda\Documents\CV-EIS\aptamer-histamin\14April2023\14April2023\0p0001nM';
S = dir(fullfile(P,'*.txt'));
for k = 1:numel(S)
F = fullfile(P,S(k).name); % get rid of DIR!!!!
S(k).data = readmatrix(F);
end
The DIR before the loop already returns a structure listing all of the .TXT files that it can find: what do you expect calling another DIR inside the loop would achieve?

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