I have a directory with two folders: one folder contains several subfolders with multiple .txt files (folder 1). The second folder contains several .hjson files (folder 2).
I would like load each .txt and .hjson files make a several calculation (e.g. velocity, acceleration, curvature) and save in the same .txt file adding news columns with headers (e.g. velocity, acceleration, curvature). So far, I have one code to load .txt files.
My goal is to make a code that reads, loads, computes and automatically save it. Please let me know if you have any suggestion.
%% Read and load
dir_to_search = 'C:\Programs\pedro\Test\';
txtpattern = fullfile(dir_to_search, '*.txt');
dinfo = dir(txtpattern);
for K = 1 : length(dinfo)
thisfilename = fullfile(dir_to_search, dinfo(K).name); %just the name
thisdata = load(thisfilename); %load just this file
End
You can use fprintf to write to a file.
For example:
formatSpec="%9.5f %8.5f\n";
for i=1:n
fprintf(fid,formatSpec, var1(i),var2(i));
end
Related
I would like to load different files that have more or less the same just a parameter (temperature) is changing.
For example:
detector_temp = importdata('beginning name file' temp 'K_end name file.dat');
I don't know how to make different "detector" files for all my temperatures.
For the moment I just write all the different file names. I have plenty.
Thank you in advance
Need more information to provide an exact solution but generally you can use dir to get the filenames you want and then load the data into a cell or some other container.
For example say I have a directory of mat files I want to load.
% from the desired directory
files = dir('*.mat'); % get the files I want to load
fileNames = {files.name}'; % extract just the file name
data = cellfun(#load, fileNames, 'UniformOutput', 0); % load all the files into a cell
You can then work on the data that is stored in the cell. Each file is stored in a separate cell. So file1 = data{1,1};, file3 = data{3,1} and so on.
I am just trying to read different .txt files from a directory e.g. B1.txt...Bn.txt then I want to rescale the values of each .txt file and rewrite them different .txt files in form BF1.txt,...BFn.txt. I was able to read the files using the following snippet code but couldn't rewrite them. Here is my attempt;
NoOFfiles = 4;
for k = 1:NoOFfiles
filename = sprintf('B%d.txt',k);
A = load(filename)./1000;
end
Any help,
Thank you for your time!
I have a data set of big number of videos so, I want to read these videos and save each video separately with its name because it consumes a lot of time to process among all these videos every time specially for training and classification. If you have any idea how can read all video files in the specified folder D:\words of format .avi and save each one with its own name as .MAT file.
But this code doesn't work
Thanks,,,
files = fuf('D:\words');
for i = 1:size(files);
name = files{i};
file = strcat('D:\words',name);
x = VideoReader(file.avi); %NOT SURE FROM THIS LINE%
v = read(x)
name = strcat(name,'.mat');
save(name,'v');
end
You don't need an additional function like fuf to get a list of file names.
If all your files are in "D:\words" (i.e. not in a bunch of sub-directories, which would complicate things), you can just use things like ls to fetch a list of all the avi files.
This is not the most elegant way of doing it (hard coding the directory and not using things like fullfile), but hopefully it's relatively easy to understand what's going on:
% use ls or dir to specifically match *.avi files
files = ls('D:\words\*.avi')
% note that size can return more than one value
% hence size(files,1)
for n = 1:size(files,1);
filename = files(n,:); % pick one file
% assuming this works - you might want to do some error checking
x = VideoReader(filename);
v = read(x);
% now we just want the name minus the ext
[pathstr,name,ext] = fileparts(filename);
fout = ['D:\words\',name,'.mat'];
save(fout,'v');
end
Your variable file is likely a string, not a structure:
...
file = strcat('D:\words',name);
x = VideoReader(file);
...
Or maybe this if the files in your cell array don't have extensions:
...
file = strcat('D:\words',name);
x = VideoReader([file '.avi']);
...
If your fuf function returns files that are not AVI movies, you'll need to do more work.
I have 4 folders in the same directory where each folder contains ~19 .xls files. I have written the code below to obtain the name of each of the folders and the name of each .xls file within the folders.
path='E:\Practice';
folder = path;
dirListing = dir(folder);
dirListing=dirListing(3:end);%first 2 are just pointers
for i=1:length(dirListing);
f{i} = fullfile(path, dirListing(i,1).name);%obtain the name of each folder
files{i}=dir(fullfile(f{i},'*.xls'));%find the .xls files
for j=1:length(files{1,i});
File_Name{1,i}{j,1}=files{1,i}(j,1).name;%find the name of each .xls file
end
end
Now I'm trying to import the data from excel into matlab by using xlsread. What I'm struggling with is knowing how to load the data into matlab within a loop where the excel files are in different directories (different folders).
This leaves me with a 1x4 cell named File_Name where each cell refers to a different folder located under 'path', and within each cell is then the name of the spreadsheets wanting to be imported. The size of the cells vary as the number of spreadsheets in each folder varies.
Any ideas?
thanks in advance
I'm not sure if I'm understanding your problem, but all you have to do is concatenate the strings that contain directory (f{}) and the file name. Modifying your code:
for i=1:length(dirListing);
f{i} = fullfile(path, dirListing(i,1).name);%obtain the name of each folder
files{i}=dir(fullfile(f{i},'*.xls'));%find the .xls files
for j=1:length(files{1,i});
File_Name{1,i}{j,1}=files{1,i}(j,1).name;%find the name of each .xls file
fullpath = [f{i} '/' File_Name{1,i}{j,1}];
disp(['Reading file: ' fullpath])
x = xlsread(fullpath);
end
end
This works on *nix systems. You may have to join the filenames with a '\' on Windows. I'll find a more elegant way and update this posting.
Edit: The command filesep gives the forward or backward slash, depending on your system. The following should give you the full path:
fullpath = [f{i} filesep File_Name{1,i}{j,1}];
Take a look at this helper function, written by a member of the matlab community.
It allows you to recursively search through directories to find files that match a certain pattern. This is a super handy function to use when looking to match files.
You should be able to find all your files in a single call to this function. Then you can loop through the results of the rdir function, loading the files one at a time into whatever data structure you want.
i have thousand files in a folder, however, i only need to extract out hundred files from the folder according to the filename listed in a text file into new folder. The filenames in text file is listed as a column..is that possible to be run by using matlab?what is the code shall i need to write? Thanks.
example:
filenames.txt is in the C:\matlab
folder include thousand files is named as BigFiles also in C:\matlab
files to be extracted from BigFiles folder is listed in column as below:
filenames.txt
a1sndh
sd3rfe
rgd4de
sd5erw
please advise...thanks...
Enumerate all files in a folder of a specific type (if needed) using:
%main directory to process
directory = 'to_process';
%enumerate all files (.m in this case)
files = dir(fullfile(directory,'*.m'));
numfiles = length(files);
fprintf('Found %i files\n',numfiles)
Then you could load the single column using one of the many file I/O functions in Matlab.
Then just loop through all the input names and check it's name against all the read in files (files{i}.name), and if so, move it.
EDIT:
From what I understood, you are looking for a solution along the lines:
filenames.txt
a.txt
b.txt
c.txt
.
.
.
moveMyFiles.m
%# read filenames listed in a text file
fid = fopen('C:\matlab\filenames.txt');
fList = textscan(fid, '%s');
fList = fList{1};
fclose(fid);
%# source/destination folder names
sourceDir = 'C:\matlab\BigFiles';
destDir = 'C:\matlab\out';
if ~exist(destDir,'dir')
mkdir(destDir);
end
%# move files one by one
for i=1:numel(fList)
movefile(fullfile(sourceDir,fList{i}), fullfile(destDir,fList{i}));
end
You can replace the MOVEFILE function by COPYFILE if you simply want to copy the files instead of moving them...