Can I make some kind of dump file , which contains all the variables / objects / params that a script has , in a certain point of a script , so I can then start my script from this point again without the need to load them again and just load them from the file ?
I hope I was clear enough..
thanks !
Related
I'm running a short code to open one by one a list of files and saving back only one of the variables contained in the files. The process seems to me much slower than I expected and getting slower with time, I don't fully understand why and how I could make it run faster. I always struggle with optimization. I'd appreciate if you have suggestions.
The code is the following (the ... substitute the actual path just for example):
main_dir=dir(strcat('\\storage2-...\Raw\DAQ5\'));
filename={};
for m=7:size(main_dir,1)
m
second_dir=dir([main_dir(m).folder '\' main_dir(m).name '\*.mat']);
for mm=1:numel(second_dir)
filename{end+1}=[second_dir(mm).folder '\' second_dir(mm).name];
for mmm=1:numel(filename)
namefile=sprintf(second_dir(mm,1).name);
load(string(filename(1,mmm)));
save(['\\storage2-...\DAQ5\Ch1_',namefile(end-18:end-4),'.mat'], 'Ch_1_y')
end
end
end
The original file is about 17 MB and once the single variable is saved it is about 6 MB in size.
The Matlab load function takes an optional additional argument to specify just a selected variable to read from the input file.
s = load('path/to/file.mat', 'Ch_1_y');
That way you don't have to spend time loading in all the other variables from those input .mat files that you're just going to immediately throw away.
And using save to save MAT-files over SMB shares can be slow. You might want to call save to write it to a temporary local file first, and then copy the completed file to the final destination. Sounds like more I/O, but it can actually be a net win, depending on your particular system and network. Measure it both ways to see if it's a win in your particular situation.
I can't figure out how the OS knows what files to start first... Like how does it know to run the script which lets you login, instead of another random file. How is the file executed on bootup specified?
It's a program. It can contain names of other program(s) to execute when needed and in whatever order desired. It can also take that information from a file. I see no conceptual problem here.
I have a lot of folders each containing a lot of .txt files which i need to process with matlab.
i have a script finished which does it, it reads all .txt files in 1 folder and does some computing.
so if i want to process those files i move the script into the desired folder and run it, it is kinda lame to move the script every time.
is it possile to start a script in a standard directory, then make the script to ask me to browse for the desired directory to run the script in that directory? because it doesnt write any files, it just reads. after it finishes it should reset it, so i could browse to different folders every time. like save the path in a value and clear it at the end...
i use "fopen" in that script to open the .txt files, so it could be possible to assign the full path to that function, but its important to me to being able to browse the right folder every time i run the script.
i use
path=uigetdir;
fileid=fopen([path filesep 'file.txt']);
and it works just the way i wanted.
thanks #excaza and #Laure for a quick reply
For this project we have been given code, and will be changing some inputs and assumptions. Thus, I already possess the original codes, but just changing all the creator's file paths to match my own computer is yielding me a lot of trouble. The following, and many variations of, continually yield errors.
load \Users\myname\Library\Documents\...
The error is
Error using load
'Unable to read file
\Users\myname\Library\Documents...'.
No such file or directory.
My files are stored in my Documents. Another person in my group on windows has used
load C:\Users\hisname\Desktop\...
Is there something I'm missing in my line, similar to the C drive but on Mac? Is my code just completely wrong, I'm able to load files in R quite easily, but Matlab is posing a huge hurdle. I have no experience with Matlab and have been asked simply to run this code.
On the Mac, path components are separated by /, not \. Thus, you should type
load /Users/myname/Documents/filename.mat
You can use the location bar at the top of the command window to change to the directory where your file is located, and then you can type
load filename
to load filename.mat.
Also, are you sure you have a Documents directory under Library? Why?
To run code from a file called "my_file.m", than just open your Matlab and type run my_file.m. This will run your script in the Command Window.
The load function is used, if you want to load a .mat file. These are normally files, where variables from your workspace are stored.
I need to create a matlab mfile that will run another matlab file with default values given in a txt file. It's ment to be useful for testing programs, so that user may specify values in a txt files and instead of inputing values every time he starts the program, my script will give the program default values and user will only see the result.
My idea is to load tested file into a variable, change 'variable=input('...');' for variable = default_variable;, save it to tmp file, execute, and than delete tmp file. Is this going to do the job?
I have only two problems:
1) How to eliminate the problem of duplicated variable names - i mean this must work for all scripts, i don't know the names of variables used in tested script.
2) As I wrote before - is this going to work fine? Or maybe I missed a easier way to do it - for example maybe I don't have to create a tmp file?
I really need your help!
Thanks in advance!
If the person who has to edit the default values has access to Matlab, I would recommend saveing the values in a mat file and loading them when needed. Otherwise you could just write a smalls cript that contains the assignment to certain variables, but make sure to keep this small. For example:
maxRuns = 100;
clusters = 12;
So much for setting up the defaults. Regarding the process my main advice is to wrap the thing that you want to test into a function. This way variables used in the code to call the 'script' will not interfere as a function gets its own separate workspace. Check doc function if you are not familiar with them.