Why Is Mathematica Not Graphing This 3d Graph Correctly?

[Ascendant0]

TL;DR Summary

Trying to graph y = 5sin(1/x) in both an 2d and 3d graph, and the 3d isn't looking right

As you can see from the image here, when I graph the 2d graph of y = 5sin(1/x), it comes out like I'd expect. However, when I graph it in a 3d graph, it doesn't look right at all. Can someone tell me why it isn't displaying right, or is it and I'm just missing something when I add the z axis?

 

[Dale]

You need to increase the number of plot points. But this function is just an ugly function, so don’t get your hopes up.

 

[FactChecker]

I have no explanation for that 3D graph. Its behavior near ##x=\pm 0.05## (##1/x \approx 20## radians) is strange. In the 3D plot, it is not graphing ##y=5\sin(1/x)##. It is graphing ##f(x,y)=5\sin(1/x)##, where ##y\in [-6,6]## doesn't even appear in the equation.

 

[Orodruin]

As @Dale mentioned, this is a case of low sampling relative to the frequency of the function. It is known as aliasing.

 

[Ascendant0]

You need to increase the number of plot points. But this function is just an ugly function, so don’t get your hopes up.

Thank you. How do I go about doing that in Mathematica? I'm thinking I probably need to actually learn the Mathematica language to have more versatility like that?

 

[FactChecker]

I don't have experience with Mathematica and do not have it to test things on, but this looks like something to try:
Plot3D[ ... as before ...., PlotPoints ->{10000, 3}]
Click the PlotPoints option documentation here.
You might also try adding MaxRecursion -> r. That is supposed to help when the function changes rapidly.
PS. This looks like TERRIBLE documentation, leaving a lot to guess about. Am I missing something?