[Homer-users] Short Separation in Developer's Version

[Rachel Mulheren]

The program does not crash, it just stays on the processing screen
indefinitely. I am running Matlab 2013a on an older PC (Dell Optiplex 755).
I have 5 NIRS files in the folder, about 900 sec. each.

On Wed, Apr 29, 2015 at 12:09 PM, David Boas <dboas at nmr.mgh.harvard.edu>
wrote:

>  Most likely the units are mm and you need to use 15 for the
> rhoSD_SSThresh
>
>  The fact that the processing gets “stuck” when you use 15 probably
> indicates that it is busy calculating the short separation regression. Let
> me verify, you say it gets “stuck”, but it doesn’t crash?
>
>  What type of computer are you using? How big is your data set?
>
>
>
>  On Apr 29, 2015, at 11:49 AM, Rachel Mulheren <mulherrw at dukes.jmu.edu>
> wrote:
>
>    Hello,
>
>  I included 2 short separation channels (1 cm) in my probe and now that I
> am running the processing stream including the parameters for short
> separation, I get the following message: There are no short separation
> channels in this probe...performing regular deconvolution.
> Design matrix is VERY poorly scaled...(RCond=0.000000e+00), cannot perform
> computation
>
>  Eyeballing the HRF after running this processing stream, I am not seeing
> a difference with and without the short separation, so I am guessing that
> it was not extracted from the signal.
>
>  Suggestions for what I might be doing incorrectly?
>
>  I am using Block Avg Short Sep
>  trange -5 to 17
>  gstd 1
>  gms 1
>  rhoSD_SSThresh 1.5
>
>  I have also tried with rhoSD_SSThresh 15 (in case there was a mix-up
> with mm and cm), but the processing starts and gets "stuck" on the short
> separation.
>
>  Thanks,
>
>  Rachel
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