plotting generates hidden figure

while plotting i have the following figure, which is hiden. What to do?

[Walter Roberson]

Can you post your code?

Please also post the output of

opengl info

[Moslem Uddin]

>> opengl info

Version: '4.5.0 - Build 23.20.16.4973'

Vendor: 'Intel'

Renderer: 'Intel(R) UHD Graphics 620'

RendererDriverVersion: '23.20.16.4973'

RendererDriverReleaseDate: '28-Feb-2018'

MaxTextureSize: 16384

Visual: 'Visual 0x07, (RGBA 32 bits (8 8 8 8), Z depth 16 bits, Hardware acceleration, Doub…'

Software: 'false'

HardwareSupportLevel: 'full'

SupportsGraphicsSmoothing: 1

SupportsDepthPeelTransparency: 1

SupportsAlignVertexCenters: 1

Extensions: {225x1 cell}

MaxFrameBufferSize: 16384

[Walter Roberson]

Your graphics driver is a year out of date. Updating might help.

https://downloadcenter.intel.com/product/126789/Intel-UHD-Graphics-620

Answer 1

[Walter Roberson]

Instead of using

fplot(pl_f, [0 10])

use

fplot(real(pl_f), [0 10])

Due to round-off, there are small imaginary quantities that fplot thinks are leading to discontinuities.