[Homer-users] Error invalid data matrix (d) - (Hitachi)

[Perdue, Katherine]

Hi Marina,

If you load the .nirs file into matlab by itself without Homer using:

load(‘yourFileName.nirs', '-mat')

you will see in the workspace that there should be a variable called “d”. It should say that d is a variable something like “M x N double”, where M is the number of time points (should match the “t” variable) and N is the number of channels x 2 (should match the first dimension of the “ml” variable). For the Hitachi system the output is also between 0 and 5. That means that if you type something like:

min(d(:))

it should say something like:

ans =

   1.0000e-03

and to check the max you can do

max(d(:))

and it should say something like:

ans =

    4.9998

If all of those things seem fine someone will probably have to take a look at your file (you can email me directly).

best,
Katherine


-------------
Katherine Perdue, PhD
Research Fellow in Pediatrics
Labs of Cognitive Neuroscience
Division of Developmental Medicine
Boston Children's Hospital
Office Phone: 857-218-5214

On Jan 22, 2015, at 6:36 AM, Marina Winkler <winklerm at cbs.mpg.de> wrote:

> Hi List, 
> After using Rebecca Deweys script to convert Hitachi ETG 4000 data to the *.nirs format,
> my installation of Homer2 (on Matlab R2013a) does not open the file, but gives me an 
> error message saying 1. Error: invalid datamatrix (d), it opens the Sample files though.
> Can you please help me solve this issue?
> Thanks Marina
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