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POCollecting results from a loop that returns NumPy Arrays
 

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  1. POCollecting results from a loop that returns NumPy Arrays
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    <p>I'm an admittedly pretty basic Python programmer, trying to learn as I encounter problems implementing various research problems. And I've hit one of those problems - particularly, how to handle loops where I'm returning a bunch of data, rather than the usual "out comes a single number" examples where you just add the result of the loop to everything previous.</p> <p>Here's a Gist of the unlooped script I'm trying to run: <a href="https://gist.github.com/1390355" rel="noreferrer">https://gist.github.com/1390355</a></p> <p>The really salient point is the end of the model_solve function:</p> <pre><code>def model_solve(t): # lots of variables set params = np.zeroes((n_steps,n_params) params[:,0] = beta params[:,1] = gamma timer = np.arange(n_steps).reshape(n_steps,1) SIR = spi.odeint(eq_system, startPop, t_interval) output = np.hstack((timer,SIR,params)) return output </code></pre> <p>That returns the results of the ODE integration bit (<code>spi.odeint</code>) along with a simple "What time step are we on?" timer and essentially two columns of the value of two random variables repeated many, many times in the form of 4950 row and 7 column NumPy array.</p> <p>The goal however is to run a Monte Carlo analysis of the two parameters (beta and gamma) which have random values. Essentially, I want to make a function that loops somewhat like so:</p> <pre><code>def loop_function(runs): for i in range(runs): model_solve(100) # output of those model_solves collected here # return collected output </code></pre> <p>That collected output would then be written to a file. Normally, I'd just have each model_solve function write its results to a file, but this code is going to be run on <a href="http://www.picloud.com" rel="noreferrer">PiCloud</a> or another platform where I don't necessarily have the ability to write a file until the results are returned to the local machine. Instead, I'm trying to get a return of a huge NumPy array of <code>runs</code>*7 columns and 4950 rows - which can then be written to a file on my local machine.</p> <p>Any clues as to how to approach this?</p>
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    1. COAre you trying to read a numpy array returned from a Python function, or how to write the result of a Python function to a file?
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    2. CO@DK How to take many numpy arrays returned from a Python function and combine them into one array.
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