Mailman 3 August 2011 - NumPy-Discussion

recommendation for saving data
by Brian Blais 01 Aug '11

01 Aug '11

Hello, I was wondering if there are any recommendations for formats for saving scientific data. I am running a simulation, which has many somewhat-indepedent parts which have their own internal state and parameters. I've been using pickle (gzipped) to save the entire object (which contains subobjects, etc...), but it is getting too unwieldy and I think it is time to look for a more robust solution. Ideally I'd like to have something where I can call a save method on the simulation object, and it will call the save methods on all the children, on down the line all saving into one file. It'd also be nice if it were cross-platform, and I could depend on the files being readable into the future for a while. Are there any good standards for this? What do you use for saving scientific data? thank you, Brian Blais -- Brian Blais bblais(a)bryant.edu http://web.bryant.edu/~bblais http://bblais.blogspot.com/

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Fill a particular value in the place of number satisfying certain condition by another number in an array.
by dileep kunjaai 01 Aug '11

01 Aug '11

Dear sir, How can we fill a particular value in the place of number satisfying certain condition by another number in an array. Example: A=[[[ 9.42233087e-42 - 4.71116544e-42 0.00000000e+00 ..., 1.48303127e+01 1.31524124e+01 1.14745111e+01] [ 3.91788793e+00 1.95894396e+00 0.00000000e+00 ..., 1.78252487e+01 1.28667984e+01 7.90834856e+00] [ 7.83592510e+00 -3.91796255e+00 0.00000000e+00 ..., 2.08202991e+01 1.25811749e+01 4.34205008e+00] ..., [ -8.51249974e-03 7.00901222e+00 -1.40095119e+01 ..., 0.00000000e+00 0.00000000e+00 0.00000000e+00] [ 4.26390441e-03 3.51080871e+00 -7.01735353e+00 ..., 0.00000000e+00 0.00000000e+00 0.00000000e+00] [ 0.00000000e+00 0.00000000e+00 0.00000000e+00 ..., 0.00000000e+00 0.00000000e+00 0.00000000e+00]] [[ 9.42233087e-42 -4.71116544e-42 0.00000000e+00 ..., 8.48242474e+00 7.97146845e+00 7.46051216e+00] [ 5.16325808e+00 2.58162904e+00 0.00000000e+00 ..., 8.47719383e+00 8.28024673e+00 8.08330059e+00] [ 1.03267126e+01 5.16335630e+00 0.00000000e+00 ..., 8.47196198e+00 8.58903694e+00 8.70611191e+00] ..., [ 0.00000000e+00 2.74500012e-01 5.49000025e-01 ..., 0.00000000e+00 0.00000000e+00 0.00000000e+00] [ 0.00000000e+00 1.37496844e-01 -2.74993688e-01 ..., 0.00000000e+00 0.00000000e+00 0.00000000e+00] [ 0.00000000e+00 0.00000000e+00 0.00000000e+00 ..., 0.00000000e+00 0.00000000e+00 0.00000000e+00]] [[ 9.42233087e-42 4.71116544e-42 0.00000000e+00 ..., 1.18437748e+01 9.72778034e+00 7.61178637e+00] [ 2.96431869e-01 1.48215935e-01 0.00000000e+00 ..., 1.64031239e+01 1.32768812e+01 1.01506386e+01] [ 5.92875004e-01 2.96437502e-01 0.00000000e+00 ..., 2.09626484e+01 1.68261185e+01 1.26895866e+01] ..., [ 1.78188753e+00 -8.90943766e-01 0.00000000e+00 ..., 0.00000000e+00 1.27500005e-03 2.55000009e-03] [ 9.34620261e-01 -4.67310131e-01 0.00000000e+00 ..., 0.00000000e+00 6.38646539e-04 1.27729308e-03] [ 8.43000039e-02 4.21500020e-02 0.00000000e+00 ..., 0.00000000e+00 0.00000000e+00 0.00000000e+00]]] A contain some negative value i want to change the negative numbers to '0'. I used 'masked_where', command but I failed. Please help me -- DILEEPKUMAR. R J R F, IIT DELHI

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C api doc shortcomings
by Robert Elsner 01 Aug '11

01 Aug '11

Hey Everybody, I noticed that the c-api docs (2.0.dev-72ab385) lack a clear statement what the preferred entry point into the c-api is (from a users point of view). Normally I would expect a sentence or two stating that the api entry point is arrayobject.h (or whatever). Instead the docs ponder about reading the c sources but do not give any hints where to start. I suggest something akin to the official Python docs in a prominent place: All function, type and macro definitions needed to use the Python/C API are included in your code by the following line: #include "Python.h" This implies inclusion of the following standard headers: <stdio.h>, <string.h>, <errno.h>, <limits.h>, <assert.h> and <stdlib.h> (if available). modified for Numpy. cheers Robert

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