How do I import a data file as a matrix and run a .m file from a python script?

2013 12 25
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更新时间：2013 12 25
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I have a .m file that is used to run a neural network in matlab, which I have locally installed on my computer. I am trying to write a python script that will loop through a list of possible transfer and training functions for the neural network multiple times. I've written a function to open and edit the .m file, but I don't know how to; 1. run the .m file from the python script 2. import the necessary data for the neural network as a space delimited matrix.
I have three data files that need to be imported as matrices, what would the code look like?

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Walter Roberson
Walter Roberson 2013-12-25

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To run the .m file, use
matlab -nodisplay -r "try YourScriptName; catch me; end; quit"
where YourScriptName is the file name without the .m file.
To read the data from space-separated columns, you can load() it.

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Mallory
Mallory 2013-12-25

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So is the code going to look like this, with the three files I have to load into matrices being NNinput, NNinputSiAvg340, NNoutput and the neural network file being NN_v1.m?
if true
import os
os.load('NNinput')
os.load('NNinputSiAvg340')
os.load('NNoutput')
matlab -nodisplay -r "try NN_v1; catch me; end; quit"
end

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Mallory
Mallory 2013-12-25
woops, I'm a bit new to this forum, so ignore that 'if true' and 'end' part lol
Walter Roberson
Walter Roberson 2013-12-25
Inside NN_v1.m you would have
NNInput = load('NNinput');
NNinputSiAvg340 = load('NNinputSiAvg340');
NNoutput = load('NNoutput');
followed by configuring and training and whatever-else using those three matrices.
Mallory
Mallory 2013-12-25
Okay, I put that into the NN_v1.m script, put when I run a python script with just the line
matlab -nodisplay -r "try NN_v1; catch me; end; quit"
Does it make a difference that I'm on linux? It probably does...I'm terribly sorry I didn't mention that before.
Mallory
Mallory 2013-12-25
I have matlab2013a, located at /usr/local/MATLAB/R2013a/
Walter Roberson
Walter Roberson 2013-12-25
No, that should work fine in Linux.
You can redirect output using the standard ">" redirection, if you want.
What are you seeing when you try this above ?

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Mallory
Mallory 2013-12-25

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Figured it out!
os.system("matlab -nodisplay < NN_v1.m")
Thanks for your help Walter!

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Walter Roberson
Walter Roberson 2013-12-25
Better would be
os.system("matlab -nodisplay -r 'try NN_v1; catch me; end; quit'")
When you redirect from a script, sometimes you end up with MATLAB endlessly asking for more input. And the try/catch/quit helps in case something goes wrong with the script.

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