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Sean C. Rhea
2006-09-19 18:06:55 +00:00
parent 5a6f2ed044
commit 4e9be3a063
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@@ -1,25 +1,5 @@
<!-- $Id: faq.content,v 1.4 2006/07/05 16:59:56 srhea Exp $ -->
<p>
<i>Does the output of <code>ptunpk</code> exactly match that of the software
included with the PowerTap?</i>
<p>
Almost. If you run it in compatibility mode, using the <code>-c</code>
option, it matches the PowerTap software's output exactly on everything but
the time values, at least for the five sample rides we've tried it with.
The times are a little off, but not by more than 0.1%, so we don't consider it
a big deal.
<p>
That said, the PowerTap software does some weird things, like converting from
kilometers to miles by multiplying by 0.62, but then reporting the miles
values with five digits after the decimal place. If you run
<code>ptunpk</code> without the <code>-c</code> option, it will unpack the
data in the way we think it should. The results mostly match up with the
official ones, and are almost certainly identical within the range of accuracy
of the device.
<p>
<i>I've downloaded and unpacked the data. Now what do I do with it?</i>
@@ -47,3 +27,23 @@ style="width:120px;height:240px;" scrolling="no" marginwidth="0"
marginheight="0" frameborder="0"></iframe>
</center>
<p>
<i>Does the output of <code>ptunpk</code> exactly match that of the software
included with the PowerTap?</i>
<p>
Almost. If you run it in compatibility mode, using the <code>-c</code>
option, it matches the PowerTap software's output exactly on everything but
the time values, at least for the five sample rides we've tried it with.
The times are a little off, but not by more than 0.1%, so we don't consider it
a big deal.
<p>
That said, the PowerTap software does some weird things, like converting from
kilometers to miles by multiplying by 0.62, but then reporting the miles
values with five digits after the decimal place. If you run
<code>ptunpk</code> without the <code>-c</code> option, it will unpack the
data in the way we think it should. The results mostly match up with the
official ones, and are almost certainly identical within the range of accuracy
of the device.