Sorry, I accidentally hit send long before I was finished writing. But to answer your question, they contain many 2048-element multi-channel analyzer spectra.

Darren

On Tue, Nov 16, 2010 at 9:26 AM, william ratcliff william.ratcliff@gmail.com wrote:

Actually, I do use spec when I have synchotron experiments. But why are your files so large?

On Nov 16, 2010 9:20 AM, "Darren Dale" dsdale24@gmail.com wrote:

I am wrapping up a small package to parse a particular ascii-encoded file format generated by a program we use heavily here at the lab. (In the unlikely event that you work at a synchrotron, and use Certified Scientific's "spec" program, and are actually interested, the code is currently available at https://github.com/darrendale/praxes/tree/specformat/praxes/io/spec/ .)

I have been benchmarking the project against another python package developed by a colleague, which is an extension module written in pure C. My python/cython project takes about twice as long to parse and index a file (~0.8 seconds for 100MB), which is acceptable. However, actually converting ascii strings to numpy arrays, which is done using numpy.fromstring, takes a factor of 10 longer than the extension module. So I am wondering about the performance of np.fromstring:

import time import numpy as np s = b'1 ' * 2048 *1200 d = time.time() x = np.fromstring(s) print time.time() - d _______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion

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