Linear Fit using Bisquare method fails on certain data sets.

I noticed some behavior that I didn't understand, so I thought I'd post it. I'm using Linear Fit.vi in LabVIEW 8.2 to calculate a slope and offset. This VI has a method input that accepts an enum. When I select the "Bisquare" method on some data sets I get error -20104 (Analysis: Input parameters have at least one NaN element). I think that if some data sets don't work with certain algorithms, this should be mentioned in the help. This took quite some time to track down.
Here is an example of a data set that doesn't work with Linear Fit.
X: Y:
0.40336656 -4.04062388
0.20171238 -2.01997989
0.00072204 -0.00951483
-0.20006598 1.99094268
-0.39979904 3.99578023

I can reproduce the problem.
Interestingly, it works fine if you increase the tolerance input a little bit, e.g. to 0.0004 (from the default 0.0001). It also starts working if you change the data a little bit.
Curious that it works on the Mac. There must be something pathalogical with this exact data set. Maybe it cause an unhandled division by zero in one of the iterations.
LabVIEW Champion . Do more with less code and in less time .

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The tag: "div" doesn't have an attribute: "spry:region" in
currently active versions.[XHTML 1.0 transitional]
The tag: "th" doesn't have an attribute: "spry:sort" in
currently active versions.[XHTML 1.0 transitional]
and so on.
What´s wrong?!

Hello barvid,
Ok, let's take each problem step by step:
1. The first error you see in the browser: " Exception while
loading ..." normally appears when you try to load files that are
not permitted by the browser security model. This means the XML
file you try to load is located on a different server than your
HTML which is not allowed. The browser is not permitting to load
any files that are not in the same domain as the current page
because of the complex security risks. You'll have to either get
the XML file from its original location and save it in your website
or use a proxy on your web server that should request that file
from the external server and send it to the browser as an XML from
the same domain as the HTML origin.
1.2 The "Exception while loading ..." error you see is a
generic error and my previous advise is based on my experience. In
case this is not your scenario you'll have to open the SpryData.js
and around line 112 you'll see the following code:
Spry.Debug.reportError("Exception caught while loading " +
url + ": " + e);
Please change this line with the following line of code:
Spry.Debug.reportError("Exception caught while loading " +
url + ": " + (e.message?e.message:e));
to obtain a more verbose error message that may clarify the
reasons of your errors.
2. The problems you describe are not browser errors but they
are w3c validation errors. At this point the XHTML standard allows
every application that define custom namespace attributes to also
link a DTD to the page so the page to continue to be valid.
Unfortunately at this point this feature is not correctly supported
by the FF and IE so we wrote an articles about how you should
link
the Spry DTD to your page so the validator understand the
custom attributes Spry use. You'll find inside the full description
of the problems and all the technical details you'll need to know
to solve this issue.
Regards,
Cristian

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