I'm using MATLAB under Windows, and trying to display (dump) the contents of a text file in the command shell. It seems like overkill to open a small file in the editor, or to load the file to use disp.
Use type and specify the explicit file name (including the extension), for instance:
type('myfile.txt')
As well as type, there's also dbtype which lets you pick a start and end range to print, and shows line numbers - handy for listing source files.
Related
I've been trying to make the output shown in the text file instead of the command window. Im blur right now as i already look at a lot of example but it always show the error on fprintf. I try to edit the code of fprintf(fid,'%s\n',word);%Write 'word' in text file (upper) in one of the Matlab example which is Automatically Detect and Recognize Text in Natural Images.
This is the link of the code.
https://www.mathworks.com/help/vision/examples/automatically-detect-and-recognize-text-in-natural-images.html?s_tid=srchtitle
Basically the above link display the output on the command window. But, i need it to be on the txt file.
Im really new to this, i want to know what code do i need to put, how and where should i put the fprintf to make the output shown on the text file and not on the command window.
Also, can i save the text file after that? do i to put any additional code?
I really need your help. Thank u in advance!
It seems you're looking for the fopen() method. It takes two parameters, the first being the name of the file you'd like to write to, and the second being the mode. If the file specified does not exist in the root directory, it will be created on execution.
fileID = fopen('exp.txt','w');
fprintf(fileID, fid,'%s\n', word);
fclose(fileID); % Make sure to always close the stream after finishing
More on fopen() here
I am simply trying to load ascii files with two columns of data (spectral data).
They were saved originally as .asc.
I need to open and edit them using text editor before I can load them into Matlab to erase the headers, but some of them somehow got converted to unix executable foramt with the .asc extension. And others are plain text docs also with the same extension. I have no idea why they got saved with the same extension and with my same manipulation as different kind formats.
When I use the load command in Matlab, the plain text docs load normally as expected but the ones saved as unix executable kinds give me this error:
Error using load Unable to read file filename.asc: No such file or
directory.
How can I either resave them (still with the same extension) or otherwise load them to be read by Matlab as standard two column data matrixes?
Thanks!
If these are truly plain text files, try renaming the file from xxx.asc to xxx.txt. Then, see if you are able to edit them as desired.
So, I currently have a MATLAB script that does stuff with data and then, using a template .dat file, creates about 20 more .dat files with only a single column being changed (I've been using the dataset and export functions to read and write the files, respectively). The program that will use the .dat files, ExperimentBuilder, requires that the headers have names that start with dollar signs (for example: $image). However, when I use the dataset function in MATLAB to import the template file, I get this warning:
Warning: Variable names were modified to make them valid MATLAB identifiers.
It then replaces all the dollar signs in the variables to x_ (for example, x_image), which would be fine if it would let me change it back to the $ format. But whenever I try to using set , it just gives me this warning again and reverts it back to x_, which is unreadable by ExperimentBuilder.
I know I could just do a quick copy and paste on each file with the original headings, but I would like to know if there's a way to fix this problem in the actual code.
Thanks!
Thing is the MATLAB database uses the header names to provide access to the columns by name, this is why the header names must be valid identifiers (isvarname() states that it must starts with a letter, and contains only valid alphanumeric characters [a-zA-Z0-9_]).
The easiest solution would be manually write the header line yourself (including names starting with $), while separately exporting the data without the headers:
export(ds, ..., 'WriteObsNames',false)
(Note that dataset.export overwrites files by default, so you'll have to export first, then prepend the header line at the beginning of the file. Or if you're comfortable modifying MATLAB own functions, then go edit dataset.export and change the fopen mode from overwrite 'wt' to append 'at' mode).
We received as input in our application (running on Windows) a list of files. These files were automatically extracted from a database with a script.
Apparently some of the names are containing special characters (like accents) and these characters are rendered as '©' on our side.
How can rename programmatically these text files (around 900'000) to get rid of this character?
We cannot change the source neither re-extract the files.
The problem is that because of this character another program involved with our system does not accept the files.
Have a look at the unix command rename. It allows you to apply a perl regex to the names of a bunch of files. In this case you might want something like:
$ rename 's/[^a-zA-Z0-9]//' *
In debian the rename command is part of the perl package. It should also be available on CPAN.
I ended up creating a new script that reads the input files and search for special characters in their title.
It was quite easy indeed:
string filename = filename.Replace("©", "e");
Since the '©' is in the filename, the script (in C#) is able to recognize it and replace the match accordingly. In this way I can loop through all the folders and subfolders simply reading the filename and change specials characters.
Thank you all for the contributions!
We all know MATLAB provides tab-completion for filenames used as arguments in MATLAB function like importdata,imread. How do we do that for the functions we create?
EDIT:
Displays the files and folders in the current directory.
Caution: unsupported hack here.
Take a look at the file toolbox\local\TC.xml in your Matlab installation. This appears to contain the argument type mappings for tab completion. (I found this by just grepping the Matlab installation for "imread" in R2009b.)
Adding this line inside the <TC> element will get you tab-completion of file names for each of its arguments.
<binding name="importdata" ctype="FILE"/>
This requires modifying the Matlab installation in place. For some of the other files in toolbox/local, like classpath.txt, you can override them by placing modified copies in the directory you start Matlab from, but this didn't work for TC.xml for me.
There is no supported way to add your functions to the argument Tab completion, but one trick I use is to put a "!" in front of the command so it is treated like a system command. Tab will then complete file paths. Once my MATLAB command is done, I home to the beginning of the line, delete the "!" and press enter.
For Matlab 2016a and above :
The file Tc.xml is not present in Matlab 2016a onwards. It uses a .json (Java Script Object Notation) file to achieve the same. A simple example of this can be as follows.
Suppose you have a Matlab function file called myFunction.m. Furthermore, suppose that this function needs files with extension .ext as input and you want the tab-completion to show all possible input options for this function. Then, write the following content in a file and name it functionSignatures.json.
{
"myFunction":
{
"inputs":
[
{"name":"filename", "kind":"required", "type":"filepath=*.ext" }
]
}
}
Place this file in the same directory as myFunction.m file. Now, restart Matlab.
What this file does : While typing in the function input, upon pressing tab, you will see a list of files with the extension .ext popping up. If you want all the files to be shown in tab completion popup irrespective of their extension, then replace "type":"filepath=*.ext" with "type":"filepath" in the file functionSignatures.json.
Source : https://www.mathworks.com/matlabcentral/answers/306157-how-to-configure-tab-completion-for-my-function-in-matlab-2016#answer_237857