b0_dem model not working for 3D data

[mathieuboudreau]

I encountered this error while helping an external user that had 3D data.

After downloading our demo data, I copied the singleton slice (in third dimension) so that it would now have two slices:

[a,b] = nii_load('Magn.nii.gz');
a(:,:,2,:) = a;
[c,d] = nii_load('Phase.nii.gz');
c(:,:,2,:) = c;

I then saved them, and loaded them into our GUI and tried to fit the data. This is the error that occurred.

Index in position 1 exceeds array bounds. Index must not
exceed 64.

Error in laplacianUnwrap (line 47)
            phaseWrappedNew(y2,x2,z2) = phaseWrapped(y1, x1, z1);

Error in b0_dem/fit (line 112)
                    Phase_uw(:,:,:,iEcho) = laplacianUnwrap(Phase(:,:,:,iEcho), Magn>obj.options.Magnthresh);

Error in FitData (line 260)
    Fit = Model.fit(data);

Error in qMRLab>FitGo_FitData (line 404)
FitResults = FitData(data,Model,1);

Error in qMRLab>FitGO_Callback (line 386)
FitGo_FitData(hObject, eventdata, handles);

Error in gui_mainfcn (line 95)
        feval(varargin{:});

Error in qMRLab (line 41)
    gui_mainfcn(gui_State, varargin{:});

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)qMRLab('FitGO_Callback',hObject,eventdata,guidata(hObject))
 
Error while evaluating UIControl Callback.

I tried briefly understanding how this error happened, but am unable to figure it out as it is within an external tool that I did not write (laplacianUnwrap.m). It's making me question if this 3D functionality was fully tested before merging, as I don't think we've touched this file since then?