please help explain this weird waveform

[maninnet]

i built a very simple simulink model as in the attachment, and capture the simulation result.
Why the waveform is kinda weird? It seems that the scope usually does not display
an accurate waveform unless we plot it using some plot command in the workspace, could someone explain and help fix it thanks.

 

[bulx]

Your sampling rate is not enough.

You have set the rate of the generator as 0 (may be it means use sampling time of the following connected block (a scope here)). Give a sampling rate of some 5-10 samples per cycle if you want to see a pleasing waveform. (this would slow down the simulation if you had had a large simulation)
- b

 

[maninnet]

got it, i made a stupid setup, thank you for pointing out the cause.