When I run a terminal command it generates some text data in the terminal display. Suppose blck is some executable software tool installed on my desktop. I call this tool in the terminal on a file named main.txt in the current working directiory like this:-
$ blck -f main.txt
This prints some information immediately below the command call. I have to process this text to glean some information from it. I have the matlab code to process this text. But how to call this terminal command in Matlab and then transfer the resulting text information to Matlab variables. once I have the information displayed from the command call in Matlab then I can simply run my processing code on it.
Related
I installed an application named lqns in the path: /home/robb/Research/dist/lqns-6.2/lqns (lqns is a folder containing the executable lqns). I want the program to be executed in command line simply calling lqns in the shell, I solved this adding to the file ~/.bashrc the line:
export PATH=$PATH:/home/robb/Research/dist/lqns-6.2/lqns
And it works with no issue. I am now trying to execute this program inside a Matlab script, running:
[status, ~] = system("lqns " + filename, '-echo');
Where filename is the path of an input file. I get the error message:
/bin/bash: line 1: lqns: command not found
Running the exact same command with the shell I get no error: the program runs with no problem generating the relative output.
Running getenv('PATH'); in Matlab and printenv PATH on my OS shell I indeed get two different results: Matlab does't have the path to lqns. I even tried editing manually the files /etc/environment, /etc/bash.bashrc and /root/.bashrc, with no result. How can I solve this issue?
you need to launch matlab by typing matlab in a terminal, not by double clicking on its shortcut from your desktop. (or even typing ./matlab in a terminal from your desktop)
it's up to the operating system to determine what double clicking does, and it's not guaranteed to execute most of your shell initialization scripts (or even launch it from the correct shell to begin with).
more info at Why are environment variables not resolved when double-clicking .desktop file?
I'm attempting to execute a script from the shell (Mac OS) using Octave, and this is exactly what I type:
$ open -a octave "my_script.m"
The result, is that Octave (the full application in the GUI) opens and doesn't run the script.
Ideally, I'd like Octave to actually run in Terminal (without the GUI), and execute whatever commands and scripts I type there, including, as noted above, an entire script stored in a .m file.
I also tried the following:
$ octave-cli my_script.m
Which produces the following error:
-bash: octave-cli: command not found
I installed Octave through a DMG file linked to on the official GNU website.
The command you're looking for is called octave-cli, and there's no need to open, just octave-cli my_script.m.
I am running a MATLAB script from the Windows command prompt:
"C:\Program Files\MATLAB\R2014B\bin\matlab" -nodisplay -nosplash -nodesktop -wait -r "test.m"
The test.m is simple:
function test
disp('Hello!');
The output is displayed in the Matlab Command Window. Is there any way how I can force output to the windows prompt?
Use the command line option -log when you call Matlab from the command line (or any other shell or batch (e.g. cmd or bat) script).
It isn't documented as of Matlab 2017b, but it works.
Side note: -nodisplay isn't supported in the Windows version of Matlab, but if you want to prevent it from displaying figures, use -noFigureWindows instead.
Since R2019b, there is a new command line option, -batch, which redirects the output to the command line and handles other stuff for batch processing. See the documentation for Windows.
matlab -batch "statement to run"
This starts MATLAB without the desktop or splash screen, logs all output to stdout and stderr, exits automatically when the statement completes, and provides an exit code reporting success or error.
I don't know of a way to do it in Windows to get Matlab to actually run in the DOS window which is what you would need for the display to be written in it. (FYI: You can in LINUX - but I assume you need to run in Windows).
For running in Matlab you have 2 alternatives that I can think of:
-logfile FILE on launch which will record all output to a FILE you specify - however how and when the file is written to disk is controlled by Matlab and I haven't tested to see - if your code doesn't do much it might only be written on Matlab exit.
diary FILE in your Matlab command, i.e. -r "diary FILE.TXT; test.m; diary OFF" - this is similar to above - but uses the diary function.
However you can get what you want if you can run your code compiled (I know thats a big if as you may not have the compiler - or if you regularly want to update test.m this is not the most efficient...
When you run a compiled code from a DOS prompt all the terminal messages are written to the DOS prompt. One thing I'd advise if this is suitable is to delete the "splash.png" file from your installation directory to avoid the splash screen displaying when you run from the DOS as its (probably) not needed.
I have found a solution at:
https://www.mathworks.com/matlabcentral/answers/91607-how-can-i-redirect-the-command-window-output-to-stdout-and-stderr-when-running-matlab-7-8-r2009a-i#answer_100958
I will replicate it here for convenience.
First I need to modify the matlab script to output to a text file:
function test
fid=fopen('output.txt','w');
fprintf(fid,'Hello!');
fclose(fid);
Then I should run the Matlab using a bat file with one additional command to display the contents of the output.txt:
"C:\Program Files\MATLAB\R2014B\bin\matlab" -nodisplay -nosplash -nodesktop -wait -r "test.m"
type output.txt
The type command will display the contents of 'output.txt' in the command window. So answer from #matlabgui was almost there. Thank you.
It is not a very elegant solution, but it works.
I am running a MATLAB script from the Windows command prompt:
"C:\Program Files\MATLAB\R2014B\bin\matlab" -nodisplay -nosplash -nodesktop -wait -r "test.m"
The test.m is simple:
function test
disp('Hello!');
The output is displayed in the Matlab Command Window. Is there any way how I can force output to the windows prompt?
Use the command line option -log when you call Matlab from the command line (or any other shell or batch (e.g. cmd or bat) script).
It isn't documented as of Matlab 2017b, but it works.
Side note: -nodisplay isn't supported in the Windows version of Matlab, but if you want to prevent it from displaying figures, use -noFigureWindows instead.
Since R2019b, there is a new command line option, -batch, which redirects the output to the command line and handles other stuff for batch processing. See the documentation for Windows.
matlab -batch "statement to run"
This starts MATLAB without the desktop or splash screen, logs all output to stdout and stderr, exits automatically when the statement completes, and provides an exit code reporting success or error.
I don't know of a way to do it in Windows to get Matlab to actually run in the DOS window which is what you would need for the display to be written in it. (FYI: You can in LINUX - but I assume you need to run in Windows).
For running in Matlab you have 2 alternatives that I can think of:
-logfile FILE on launch which will record all output to a FILE you specify - however how and when the file is written to disk is controlled by Matlab and I haven't tested to see - if your code doesn't do much it might only be written on Matlab exit.
diary FILE in your Matlab command, i.e. -r "diary FILE.TXT; test.m; diary OFF" - this is similar to above - but uses the diary function.
However you can get what you want if you can run your code compiled (I know thats a big if as you may not have the compiler - or if you regularly want to update test.m this is not the most efficient...
When you run a compiled code from a DOS prompt all the terminal messages are written to the DOS prompt. One thing I'd advise if this is suitable is to delete the "splash.png" file from your installation directory to avoid the splash screen displaying when you run from the DOS as its (probably) not needed.
I have found a solution at:
https://www.mathworks.com/matlabcentral/answers/91607-how-can-i-redirect-the-command-window-output-to-stdout-and-stderr-when-running-matlab-7-8-r2009a-i#answer_100958
I will replicate it here for convenience.
First I need to modify the matlab script to output to a text file:
function test
fid=fopen('output.txt','w');
fprintf(fid,'Hello!');
fclose(fid);
Then I should run the Matlab using a bat file with one additional command to display the contents of the output.txt:
"C:\Program Files\MATLAB\R2014B\bin\matlab" -nodisplay -nosplash -nodesktop -wait -r "test.m"
type output.txt
The type command will display the contents of 'output.txt' in the command window. So answer from #matlabgui was almost there. Thank you.
It is not a very elegant solution, but it works.
Is there a way of running a MATLAB script from Notepad++?
Obviously I have MATLAB installed on my computer. I know you can set a path for Notepad++to run when you hit F5, but when I set this path to my MATLAB.exe file, it simply opens another instance of MATLAB.
This is not what I want, I want the actual script in Notepad++ to be executed in the already open and running instance of MATLAB.
I'm afraid I'm not on my home computer at the moment to test this out, so the following is just a suggestion for you to try.
If you take a look at the NppExec plugin for Notepad++, you'll see that with it you can specify a command to be run when you hit F6 (like an enhanced version of hitting F5 in the regular Notepad++). You can also give it variables such as the path to the current file, and the name of the current file.
MATLAB (on Windows at least - I assume you're on Windows) makes available an API over ActiveX/COM. If you search in the MATLAB documentation for details, it's under External Interfaces -> MATLAB COM Automation Server. By running (in MATLAB) the command enableservice('AutomationServer') you will set up your running instance of MATLAB to receive instructions over this API.
You should be able to write a small script (perhaps in VBScript or something similar) that will take as input arguments the path and filename of the current file in Notepad++, and will then connect to a running instance of MATLAB over the COM API and execute the file's contents.
Set this script to be executed in NppExec when you hit F6, and it should then run the current file in the open instance of MATLAB.
As I say, the above is just speculation as I can't test it out right now, but I think it should work. Good luck!
Use NppExec add-on and press F6, copy paste the following and save the script:
NPP_SAVE
set local MATPATH=C:\Program Files\MATLAB\R2015a\bin\matlab.exe
cd "$(CURRENT_DIRECTORY)"
"$(MATPATH)" -nodisplay -nosplash -nodesktop -r "try, run('$(FILE_NAME)'),
catch me, fprintf('%s / %s\n',me.identifier,me.message), end"
then run (press F6; enter). Matlab Console and Plot windows still open and stay open. Error messages will be displayed in opening Matlab command window. Adding
, exit"
to the last command will make it quit and close again. If you want to run an automated application with crontabs or the like, check Matlab external interface reference for automation.
matlab.exe -automation ...
Also works in cmd terminal, but you have to fill in the paths yourself.
This is a usable implementation upon Sam's idea. First, execute MATLAB in automation mode like this.
matlab.exe -automation
Next, compile and execute this following VB in NppExec plugin. (which is to use MATLAB automation API)
'open_matlab.vb
Imports System
Module open_matlab
' connect to a opened matlab session
Sub Main()
Dim h As Object
Dim res As String
Dim matcmd As String
h = GetObject(, "Matlab.Application")
Console.WriteLine("MATLAB & Notepad++")
Console.WriteLine(" ")
'mainLoop
while True
Console.Write(">> ")
matcmd = Console.ReadLine()
' How you exit this app
if matcmd.Equals("!!") then
Exit while
End if
res=h.Execute(matcmd)
Console.WriteLine(res)
End while
End Sub
End Module
Then you'll get a matlab-like terminal below your editor. You can then code above and execute below. type !! to exit the terminal.
What it looks like
Tips: don't use ctrl+c to interrupt the MATLAB command, because it will kill the whole process instead.