How to do logging in matlab : anything similar to logging like python

Question

I am new to matlab:

I was working in python, I generally use logging a lot to keep track of the code. In python, we can use below

import logging
logger = logging.getlogger()
logger.setLevel(logging.INFO)
handler = logging.FileHandler("log.txt",mode=w+)
handler.setlevel(loggin.INFO)
logger.addHandler(handler)

#And any where in the code use it as

logger.info("testing")

How can we do something similar in matlab

MATLAB has a wonderful debugger, you should look into that rather than logging. Plus, you can use warning to output comments for the user that can be turned off. — Cris Luengo
– Cris Luengo, Commented Nov 11, 2020 at 19:03
debugger is good, but if we have logging, its like you can just turn on and off and on a sepated file we can see what happened. good to track — Santhosh
– Santhosh, Commented Nov 12, 2020 at 3:29

Andrew Janke · Accepted Answer · 2020-11-11 07:14:58Z

7

There's no built-in logging feature in Matlab. So you need to use third-party or undocumented tools.

Matlab ships the Java logging libraries SLF4J and log4j with its bundled JVM. You can make use of them for your logging. There's a Matlab SLF4M library that provides a layer of convenient Matlab bindings for SLF4J/log4j. (Full disclosure: I wrote SLF4M.)

There are also some native M-code Matlab logging libraries available on the MathWorks File Exchange:

answered Nov 11, 2020 at 7:14

Andrew Janke

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2 Comments

Santhosh Over a year ago

github.com/janklab/SLF4M looks very much what i wanted. Can we use string concatenation like logging.debug("a :: "+string(a)+" :: b :: "+string(b)) instead of sprintf format like logging.debug("a :: %s :: b :: %s,(a,b))

Andrew Janke Over a year ago

Yes. String concatenation works in any context where a plain string works. (And if SLF4M chokes on the fact that it's a string instead of a char, I'll put in a fix for it quickly.)

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