Weird Shading Shape with stat_fit() about gramm HOT 4 CLOSED

Reproducible regardless of whether using software or hardware rendering.

K>> opengl info
Version: '4.3.0 - Build 10.18.14.4414'
Vendor: 'Intel'
Renderer: 'Intel(R) HD Graphics 4600'
RendererDriverVersion: '10.18.14.4414'
RendererDriverReleaseDate: '23-Mar-2016'
MaxTextureSize: 16384
Visual: 'Visual 0x07, (RGBA 32 bits (8 8 8 8), Z depth 16 bits, Hardware acceleration, Double buffer, Antialias 8 samples)'
Software: 'false'
HardwareSupportLevel: 'full'
SupportsGraphicsSmoothing: 1
SupportsDepthPeelTransparency: 1
SupportsAlignVertexCenters: 1
Extensions: {208x1 cell}
MaxFrameBufferSize: 16384

from gramm.

from gramm.

Reproduces on Mac 2015b version... very strange bug! From the looks of it it seems that Matlab's fit() function along with predint() doesn't handle the absence of 'StartPoint' values very well in that case. You do get a warning from Matlab though!

This is solved by providing 'StartPoint' values to stat_fit:
g = gramm('x', x, 'y', y);
g.geom_point('alpha',0.2)
g.stat_fit('fun',@(a,b,x)a.*x+b,'StartPoint',[0 0]);
g.draw();

The 'fun',@(a,b,x)a.*x+b part is not needed as this is the default fitted function. I just put it here to show that there are two parameters a and b and that is why 'StartPoint' is a vector of length 2. The function can be changed!

from gramm.

Thanks piermorel, that's done the trick! I really appreciate the help.

from gramm.