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Fast function to save a matrix 1.0

  Date Added: May 12, 2013  |  Visits: 277

Fast function to save a matrix

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write_matrix_bin(f,m) saves the matrix "m" in a binaryfile "f". write_matrix_bin is a lot faster than the built in function save(), andtakes up much less diskspace than the old "save -v6" which doesn't use compression.write_matrix_bin also includes an option for compression with dzip(http://www.mathworks.com/matlabcentral/fileexchange/8899). However, thisis only for convenience, and not because it's superior than the built in save()Limitations: Think before you use write_matrix_bin() instead of save(). * Since write_matrix_bin() as default saves values as float32 it will approximate your data. * you can't save a large matrix with compression turned on. java will urn of out heap space. This is a problem with dzip.Here's a real life example (8000000 bytes = 7.6MB):>> whos data_matrix Name Size Bytes Class Attributes data_matrix 100x100x100 8000000 double Writing data to the diskwrite_matrix_bin('write.compressed.test', data_matrix, 'compress', 1) => 0.509179 seconds. Filesize: 884Ksave('write.save.test', 'data_matrix') => 0.582949 seconds. Filesize: 996Kwrite_matrix_bin('write.uncompressed.test', data_matrix) => 0.082440 seconds. Filesize: 3.9Msave -v6 'write.savev6.test' 'data_matrix' => 0.292839 seconds. Filesize: 7.7MReading data from the diskread_matrix_bin('write.compressed.test', 'compress', 1) => 0.349878 seconds.read_matrix_bin('write.uncompressed.test') => 0.103816 seconds.load('write.save.test') % the compressed file => 0.088620 seconds.load('write.savev6.test') % the uncompressed file => 0.061182 seconds.

Requirements: No special requirements
Platforms: Matlab
Keyword: 100x100x100 Attributes Bytes Class Compress Data Matrix Diskwrite Matrix Bin Writecompressedtest Double Dziphere Filesize Ksave Writesavetest Mbgtgt Problem Quot Seconds Writing
Users rating: 0/10

License: Freeware Size: 10 KB
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