On Aug 22, 2012, at 12:48 PM, Chris Kaynor <ckay...@zindagigames.com> wrote:
> Reading your post, I do not see for sure what your actual issue is, so
> I am taking my best guess: that the file does not contain as much data
> as would be expected.
>
Sorry, I should have been more explicit. The value of "i" in this instance is
2354, so the file should (I thought) have contained the value of "i" followed
by 2 x 2354 values of the data.
> On Wed, Aug 22, 2012 at 8:38 AM, William R. Wing (Bill Wing)
> <w...@mac.com> wrote:
>> In the middle of a longer program that reads and plots data from a log file,
>> I have added the following five lines (rtt_data is fully qualified file
>> name):
>>
>> wd = open(rtt_data, 'w')
>
> Here, you are opening the data for write ("w"), which will replace the
> contents of the file each time the file is opened. I am guessing you
> want append ("a").
>
No, I really do want 'w'. In the final package, this will be invoked once at
the end of the month, before the log file is compressed and rolled.
[big snip]
>>
>> Much to my surprise, when I looked at the output file, it only contained 160
>> characters [instead of ~2700 multi-character data values]. Catting produces:
>>
>> StraylightPro:Logs wrw$ cat RTT_monitor.dat
>> 2354[ 734716.72185185 734716.72233796 734716.72445602 ..., 734737.4440162
>> 734737.45097222 734737.45766204][ 240. 28.5 73.3 ..., 28.4 27.4
>> 26.4]
>>
Please look at what cat found in the file. First there is the value of "i" as
expected. This is then followed by the first 3 values of the time stamp
x-data, then a comma, an ellipsis, another comma, and the last three data
values. That patten (3 values, an ellipsis, and 3 final values) is repeated
again for the y-data array/list. It is almost as though "writelines" had
written an editorial summary of the data rather than the data.
>> Clearly I'm missing something fundamental about using the writelines method,
>> and I'm sure it will be a DUH moment for me, but I'd sure appreciate someone
>> telling me how to get that data all written out. I certainly don't insist
>> on writelines, but I would like the file to be human-readable.
>>
>> Python 2.7.3
>> OS-X 10.8
>>
>> Thanks,
>> Bill
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