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