Writing binary files
[
Date Prev][
Date Next][
Thread Prev][
Thread Next]
[
Date Index]
[
Thread Index]
- Subject: Writing binary files
- From: Keith Pimmel <keith.pimmel@...>
- Date: 2005年7月26日 09:54:21 -0500 (Central Daylight Time)
Hey gang,
I'm trying to take tabular data from an ascii file and convert it into a
MATLAB *.mat file. The one thing that I'm really struggling with is
forcing the binary write mode to fit in the bytes. Say for instance I have
the following data:
#Time Pos.x Signal
0.1 1000 1.24e-10
0.2 1010 3.714e-11
0.3 1020 5.535e-11
Assume that the above data is stored in a lua table, like so
data = {}
data.raw = {}
data.label = {}
table.insert(data.label,'Time')
...
data.raw['Time'] = {}
table.insert(data.raw['Time'], '0.1')
....
In my script, I've used the following:
f=assert(io.open('out.mat','wb')
f:write(...)
where ... is the appropriate data. Say that I've stored 5.535e-11 via
write like this:
f:write(5.535e-11)
If I examine my out.mat in vim and converted it into hex, I see that it
consumes a byte for each character (i.e., I see 5.535e-11). How do I force
the write to put the data in 8-byte double precision format? Has anyone
done anything like this before? Hopefully my question makes sense.
Thanks for any advice,
Keith
--
Keith Pimmel ~~~~ Dynetics, Inc. ~~~~ 256.964.4717