I am trying to write a program that prompts a user for their name then when they put in the name, it writes the name to a file and then stores it to a directory. I am very new to programming and not really sure what to do. So far, this is all I have below:
filename = 'programming.txt'
with open(filename,'w') as file_object:
file_object.write("I love programming.")
with open(filename, 'a') as file_object:
5.. input('enter name: ')
What should I do?
Thanks in advance!
Related
I am really a newbie in matlab programming. I have a problem in coding to import multiple csv files into one from certain folder:
This is my code:
%% Importing multiple CSV files
myDir = uigetdir; %gets directory
myFiles = dir(fullfile(myDir,'*.csv')); %gets all csv files in struct
for k = 1:length(myFiles)
data{k} = csvread(myFiles{k});
end
I use the code uigetdir in order to be able to select data from any folder, because I try to make an automation program so it would be flexible to use by others. The code that I run only look for the directory and shows the list, but not for merging the csv files into one and read it in "import data". I want it to be merged and read as one file.
My merged file should look like this with semicolon delimited and consist of 47 csv files merged together (this picture is one of the csv file I have):
my merged file
I have been working for it a whole day but I find always error code. Please help me :(. Thank you very much in advance for your help.
As the error message states, you're attempting to reference myFiles as a cell array when it is not. The output of dir is a structure, which cannot be indexed like a cell array.
You want to do something like the following:
for k = 1:numel(myFiles)
filepath = fullfile(myFiles(k).folder, myFiles(k).name);
data{k} = csvread(filepath);
end
I am really a new person in MATLAB and I need use it to finish my homework.
First, I try to open a txt file to get data.
So, I do like this:
folder='C:\Users\yshi20\Desktop\COSC6335\proj_1';
file='transactionDB.txt';
myData=fullfile(folder,file);
[Datafile, message] = fopen('transactionDB.txt', 'r');
But the datafile value always show -1 which means it failed to open.
So, I use this to check why I cannot open it:
if Datafile < 0
disp(message);
c = [];
else
Data = fread(Datafile, 5, 'uint8=>char')'
end
But the result says: No such file or directory.
But I checked many times, and I am sure the file name is correct and the location folder is correct, so, how to solve the problem?
You're using the wrong variable. You need to use myData in fopen.
[Datafile, message] = fopen(myData, 'r');
myData stores the complete path to your file whereas in your original code, you're using relative referencing which means that it's going to look for the file in the current working directory. A -1 code means that it can't find the file... and rightfully so given your error. It can't find the file in the current working directory. As such, make sure you change your fopen statement so that the correct path to your file is specified.
I have several data log files (here: 34) for those I have to calculate some certain values. I wrote a seperate function to publish the results of the calculation in a pdf file. But I only can publish one file after another, so it takes a while to publish all 34 files.
Now I want to automize that with a loop - importing the data, calculate the values and publish the results for every log file in a new pdf file. I want 34 pdf files for every log file at the end.
My problem is, that I couldn't find a way to rename the pdf files during publishing. The pdf file is always named after the script which is calculating the values. Obviously the pdf is overwritten within a loop. So at the end everything is calculated, but I only have the pdf from the last calculated log file.
There was this hacky solution to change the Matlab publish script, but since I don't have admin rights I can't use that:
"This is really hacky, but I would modify publish to accept a new option prefix. Replace line 93
[scriptDir,prefix] = fileparts(fullPathToScript);
with
if ~isfield(options, 'prefix')
[scriptDir,prefix] = fileparts(fullPathToScript);
else
[scriptDir,~] = fileparts(fullPathToScript);
prefix = options.prefix; end
Now you can set options.prefix to whatever filename you want. If you want to be really hardcore, make the appropriate modifications to supplyDefaultOptions and checkOptionFields as well."
Any suggestions?
Thanks in advance,
Martin
Here's one idea using movefile to rename the resultant published PDF on each iteration:
for i = 1:34
file = publish(files(i)); % Replace with your own command(s)
[pathStr,fileName,ext] = fileparts(file);
newFile = [pathStr filesep() fileName '_' int2str(i) ext]; % Example: append _# to each
[success,msg,msgid] = movefile(file,newFile);
if ~success
error(msgid,msg);
end
end
Also used are fileparts and filesep. See this question for other ways to rename and move files.
I have some files to process , but i have missing files in middle
i am using
for i=1:file;
fid = fopen(['Raw',num2str(i),'.txt']);
D = textscan(fid1,'%*f %f%*f%*f%*f%f%f%[^\n]','delimiter',';', 'headerlines',50,'CollectOutput', 1);
fclose(fid);
Now the rest of program works well when i have files in order
i.e, 100,200 any number of files in my folder in order as Raw1.txt, Raw2.txt, Raw3.txt, ....
I get into trouble as soon as there are missing files like Raw1.txt, Raw4.txt, Raw5.txt
How do i iterate my text scan so it can ignore the file numbering?
Thanks
Edit :
By missing files i mostly mean numbers after 'Raw'
My files get generated as Raw1, Raw2, Raw3............ Raw400.txt
When all the files are in order and present i have no problem.
when i have some missing or jumps like for example
Raw1 . Raw2.......... Raw10, Raw15, Raw16
I have trouble as there is jump from Raw10.txt to Raw15.txt
I have same problem if my files start at anything other than Raw1.txt
look for exist in matlab documentation. Something like this should work:
for i=1:file;
if exist(['Raw',num2str(i),'.txt'], 'file')
% File exists!
fid = fopen(['Raw',num2str(i),'.txt']);
D = textscan(fid1,'%*f %f%*f%*f%*f%f%f%[^\n]','delimiter',';', 'headerlines',50,'CollectOutput', 1);
fclose(fid);
end
end
Note that exist(Name, 'file') checks for the file's directory too, so either give the full file name (i.e. with path), or try something like if exist(Name, 'file') == 2
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.