[Homer-users] Saving Data to Clipboard

[thuppert]

I never figured out how to save the transpose of the data to clipboard.  Its
always a row vector no matter what I tried. If anyone knows, I'd love to
here the solution.  I'm not sure the clipboard command in Matlab lets me
cause it saves everything as strings and not numbers.


The easiest thing to do is to use the "export data to file" by clicking on
the plot window (entire time course or HRF) and then select ASCII instead of
*.mat formats.  This will export as an ASCII file which EXCEL can read
directly.  The problem is that its now the entire matrix of src-det pairs
rather then only that pair (as was the case in copy to clipboard)...  This
is a column vector though, which is what you want.  The original "ml"
variable (loaded in the raw data file) tells you what each column is.


-Ted





-----Original Message-----
From: homer-users-bounces at nmr.mgh.harvard.edu
[mailto:homer-users-bounces at nmr.mgh.harvard.edu]On Behalf Of Margaret
Duff
Sent: Wednesday, February 16, 2005 12:14 PM
To: thuppert
Cc: homer-users at nmr.mgh.harvard.edu
Subject: RE: [Homer-users] Saving Data to Clipboard


hi ted,  the reason i asked this question is that i am trying to save my
data to use in excel.  i had originally used 0-30s, but when importing
that to excel, it fills a row.  the row isn't long enough, runs out of
columns and clips the file.  do you know of a better way to save the data
or convert it so that i can see my whole data set?  is there any way to
save the data to the clipboard as a column instead of a row?  oh, and i
was using delta optical density, not concentration. sorry for that
confusion.   thanks, margaret


On Mon, 14 Feb 2005, thuppert wrote:

> There are two reasons where this might occur (that I thought of off-hand).
> I don't know if either applies.
>
> 1) By default, the averaging (or deconvolution) preforms a detrend on the
> HRF.  This means that it removes linear trends from the data.  After
> detrending, the change at the zero-point (time=0) is set to zero (this
> removes any DC component).  If the 20-30s component is signifantly
different
> from zero mean, then this detrend can produce such results.  Ideally, the
> HRF should return to baseline by the end of the post-stim time (and so no
> problems should occur).  If not, maybe a longer post-time is required.
>
> 2) If you are doing a deconvolution, (particularly if any of the
inter-stim
> intervals are less then 30s) then this difference could be the result of
the
> 20sec post-time not being long enough to fully model out the tail of the
> HRF.  In that case, the longer post-time is giving a more accurate
> deconvolution.  However, even if the HRF ends by 20s, still a 30s and 20s
> deconvolution can differ depending on the efficancy of the stimulus
> presentation (something set in the orignal experimental design).  The HRF
> window (i.e. pre and post-stimulus times) are actually parameters that
would
> go into creating an ideal stimulus presentation for deconvolution.  At the
> very least, think that a 30s deconvolution is fitting the same amount of
> measurements with more unknowns (and hence affects the SNR).
>
>
> *As a side note, I don't think that delta-conc. changes should really ever
> be in the the range of 0.001.  That's a ~1mM change... plus/minus partial
> volume etc. (which is like a 1000% change!!).
>
>
> Ted Huppert, M.Sc.
>
> PhD student-Harvard Univ.
> Dept of Biophysics
> Photon Migration Imaging lab
> Mass General Hospital/CNY
>
> Tele: (617)726-1223
> Cell: (617) 869-1205
>
> thuppert at nmr.mgh.harvard.edu
>
>
>
> -----Original Message-----
> From: homer-users-bounces at nmr.mgh.harvard.edu
> [mailto:homer-users-bounces at nmr.mgh.harvard.edu]On Behalf Of Margaret
> Duff
> Sent: Monday, February 14, 2005 2:35 PM
> To: homer-users at nmr.mgh.harvard.edu
> Subject: [Homer-users] Saving Data to Clipboard
>
>
> Hello,  I am saving on of my channel's data to the clipboard to be looked
> at using Excel.  However, when I save data averaged over -5 to 20 seconds
> and -5 to 30 seconds, the data changes.  I would expect the all the time
> points from the -5 to 20 seconds average to remain in the -5 to 30 seconds
> average data.  They are close but off by about .001 or so, which is kind
> of a lot when looking at delta concentrations.  Is there anything inherent
> to the averaging process or saving data to the clipboard that could cause
> this discrepancy?  Thanks, Margaret Duff
>
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