External Email - Use Caution Hello FreeSurfer Developers,
I am trying to do a retinotopy analysis. My retinotopy has 8 bars, this bars
swipe the visual field from the 8 possible directions (all multiple of 45
degrees angle). One complete swipe takes 24 sec. I have 16 different positions
per swipe. So I have tried using -retinotopy 24 (period of a complete swipe) or
1.5 (period of each individual bar) in every case i always end up having the
same error. For some reason Xcond = NaN (normalized). I tried eccen pos, eccen
neg even polar neg and pos in my paradigm files and get always the same result.
Can someone help me? this is what i get:
Creating Design Matrix
... creation time = 0.006 sec
DoMCFit = 1
ntptot = 119, nX = 35, DOF = 84
Saving X matrix to ~/Project/Sess02/bold/rtopy.self.lh/pr001/Xtmp.mat
XCond = NaN (normalized)
Warning: Matrix is singular to working precision.
> In fast_selxavg3b (line 403)
Computing contrast matrices
Warning: Matrix is singular to working precision.
> In fast_selxavg3b (line 441)
Warning: Matrix is singular to working precision.
> In fast_selxavg3b (line 441)
OLS Beta Pass
run 1 t= 0.0
reading data ... 0.820008
Global Mean 146.10
Global In-Mask Mean = 146.104 (NaN)
Rescale Target = 100
RescaleFactor = 0.684444
OLS Residual Pass
run 1 t= 0.0
reading data ... 0.776954
Saving rho1
Found 0 voxels with corrected AR1 > 0.90
Not Whitening
Warning: Matrix is singular to working precision.
> In fast_glmfit (line 54)
In fast_selxavg3b (line 999)
Found 7921 zero-valued voxels
Computing contrasts
Starting contrasts
eccen J=2 -------------
Warning: Matrix is singular to working precision.
> In fast_fratiow (line 86)
In fast_selxavg3b (line 1161)
Warning: Matrix is singular, close to singular or badly scaled. Results may be
inaccurate. RCOND = NaN.
> In fast_fratiow (line 86)
In fast_selxavg3b (line 1161)
Error using betainc
X must be in the interval [0,1].
Error in FTest (line 51)
p = betainc(z, dof2/2, dof1/2);
Error in fast_selxavg3b (line 1163)
pmat = FTest(dof1, dof2, Fmat);
If i look into the X.mat m betainc is filled witn NaN.
I have atteched my analysis info and X.mat.
Let me know if you need more informations about my analysis.
Best,
Tiago Mesquita
analysis.info
Description: analysis.info
X.mat
Description: X.mat
_______________________________________________ Freesurfer mailing list [email protected] https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Mass General Brigham Compliance HelpLine at https://www.massgeneralbrigham.org/complianceline <https://www.massgeneralbrigham.org/complianceline> . Please note that this e-mail is not secure (encrypted). If you do not wish to continue communication over unencrypted e-mail, please notify the sender of this message immediately. Continuing to send or respond to e-mail after receiving this message means you understand and accept this risk and wish to continue to communicate over unencrypted e-mail.
