problem with saving dataset

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Walter
Walter 2012-1-9
Loading a dataset and saving it directly without any other variables in workspace generates a much bigger file . 1.387 Mb becomes a matfile of 137.751 Mb. Any reason for this? Matlab version 7.3 is used for saving.
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Jaap
Jaap 2012-1-9
did you look at things like format (xls,txt,...) and to data types (doubles, integers...)?

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Matt Tearle
Matt Tearle 2012-1-9
What is the size of the variable in the workspace? (You can run whos to see this info.)
If it's ~137 Mb then my guess is that it's something to do with the type of file you're reading from and/or the type of data that allows it to be compressed or stored in a small amount of memory, but when you're bringing it into MATLAB it's probably using "large-footprint" types like doubles. Simple example to explain what I mean:
1 2 3 4
2 3 4 5
3 4 5 6
4 5 6 7
saved as a text file is only 36 bytes. Read it into MATLAB and it will be a 4-by-4 array of doubles => it's 16*8 = 128 bytes.

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