I'm still getting used to Matlab, and not sure if this is possible using Matlab or not, but it's just something that popped into my head that I thought could be interesting.
Is there any way to edit the contents of a text file in Matlab?
Moreover, is there any way to edit specific parts of the text file without altering the rest?
To elaborate, let's say I had a text file that was several lines long. For instance:
This is a hypothetical text file.
The cat chased a mouse.
The mouse ran into a hole.
The cat tried to paw at the mouse.
The mouse waited in the hole until the cat got bored.
The mouse came back out when the cat left.
Is there any way to use Matlab to exclusively edit, say, line 6 and change it from "The mouse waited in the hole until the cat got bored" to "The mouse fell asleep and the cat got bored", without having to change the rest of the file?
I know of several methods to read and display contents of text files using Matlab, but I'm not sure if there's any way to actually edit the text files in Matlab.
Thanks!
As far as I know, you will always have to read the file line by line (for instance into a cell-array) and edit it as you need. After that, you write a new file or overwrite the old one.
Of course, you can encapsulate this procedure and then call you own function like
manipulateFile(lineNumber, newLineText)
Some commands that may come in handy are fopen, fscanf, textread, fprintf, and fclose.
Related
I want to build a simple script that may be useful for others as well, but I have only very basic programming knowledge and can't do it myself without learning how to write powershell scripts from scratch.
What this script is supposed to do is, open an INI file (really just a txt), look for a variable with an assigned value and replace that value from a txt hosted on GitHub, save and then run a program.
This is for the tracker list of qBittorrent, since that feature still hasn't been implemented and the only other script that I could find that does this is for linux and mac, there seem to be none for windows.
The basic idea is this:
get-content "c:\users\[user]\appdata\roaming\qbittorrent\qbittorrent.ini"
# This is where pseudo code starts
get file from "[github-link.txt]"
save file to cache # keeping it is useless as it gets updated daily
find variable "Session\AdditionalTrackers=" in qbittorrent.ini
replace value of variable with content of cached file # this is what I struggle with most when looking for example code. Everything I could find specified the exact string that needed replacing, which in this case is quite long and may change with every update of the file.
overwrite original file
launch program qbittorrent.exe
end script
Conveniently or most likely deliberately all (most) of the tracker lists on GitHub are already formatted in a way that they can be directly pasted into the file without having to worry about formatting. Example.
I can totally understand if nobody wants to do the work, but I would greatly appreciate it and possibly others that are looking for a stopgap for the lacking feature.
If this already exists, go ahead and call me an idiot and while you're at it drop a link ;)
I just found a little tool called Power Automate and it pretty much does what I was looking for. It's not quite as elegant as a single click script but it does the job. Sadly I can't share the "flow" I built because, well, there is no option for it - thanks Microsoft. So, I'll try my best to write it out.
Not quite a "solution" but pretty to close to it.
Here is the "flow":
get file from web // from github for example
read text from file // read downloaded .txt file
read text from file // read qBittorrent.ini
crop text // crop between flags in qBittorrent.ini use "Session\AdditionalTrackers=" as start and "Session\GlobalMaxRatio=" as end and save to cropVar2
crop text // crop before flag use "Session\AdditionalTrackers=" as flag and save to cropVar1
crop text // crop after flag use cropVar2 as flag and save to cropVar3
replace text // replace cropVar2 with content of downloaded file and save to cropVar2
write text to file // write cropVar1,cropVar2,cropVar3
end flow
Keep in mind that any changes to the qBittorrent.ini may change the order of the entries. Which means you have to check if it's still correct after every update and after every change you make in the options. This is a massive cludge after all...
You can input fail saves so that you won't break anything if the order changed.
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'm working on document recognition for scanned bank statement. The statements that I have are organized by lines, such as the one attached. Because Tesseract does such a good job at detecting the areas of text, it breaks the lines in the middle (I'm assuming this is because of the large white space between the first block in the line (blurred for privacy reason), and the next one ('EUR', or 'COURS').
In the hocr file, the bbox of all the elements in the line are within 2px or so, so I could potentially rebuild a line myself. However, this seems more like a hack. Is there a way to tell Tesseract that lines should be as wide as the document itself? Or would there be another way to go about it? I've tried playing with the psm option, but with no luck.
-psm 6 -- Assume a single uniform block of text -- should work. If not, you may want to use the older version 2.0x, which does not perform page layout analysis.
Hell,
I need to plot points out of my c++ application.
So I simply save my points to a points.txt
and then run system("gnuplot 'plotmakro'");
which contains:
set output 'plot.png' set terminal png
set grid set multiplot
plot pointsa.txt' ', 'pointb.txt'
Is there a solution so that I get plot2.png, plot3.png when running the makro again?
As far as I understand your problem two possible solutions come to my mind:
sed the output of your gnuplot script to another location before running gnuplot with the newly created script or
output the png to some arbitrary file like tmp_plot.png and change the file name after gnuplot is done to your liking.
However, with both suggestions I somehow feel that there is a nicer and cleaner solution to your problem. Maybe you want to think about your interface between your application an gnuplot...
I could not find this answer in the man or info pages, nor with a search here or on Google. I have a file which is, in essence, a text file, but it somehow got screwed up upon saving. (I think there are a few strange bytes at the front of the file accidentally.)
I am able to open the file, and it makes sense, using head or cat, but not using any sort of editor.
In the end, all I wish to do is open the file in emacs, delete the "messy" characters, and save it once cleaned up. The file, however, is huge, so I need something powerful like emacs to be able to open it.
Otherwise, I suppose I can try to create a script to read this in line by line, forcing the script to read it in text format, then write it. But I wanted something quick, since I won't be doing this over & over.
Thanks!
Mike
perl -i.bk -pe 's/[^[:ascii:]]//g;' file
Found this perl one liner here: http://www.perlmonks.org/?node_id=619792
Try M-xfind-file-literally in Emacs.
You could edit the file using hexl-mode, which lets you edit the file in hexadecimal. That would let you see precisely what those offending characters are, and remove them.
It sounds like you either got a different line ending in the file (eg: carriage returns on a *nix system) or it got saved in an unexpected encoding.
You could use strings to grab "printable characters in file". You might have to play with the --encoding though I have only ever used it to grab ascii strings from executable files.