11 - Graphing Points in 3D & Intro to 3D Functions (3D Coordinates - XYZ System) 

@Larry Cares thnx, Biomedical Engineering

So nice of you!

Thank you so much!

I really appreciate it! Jason, MathAndScience.com

I agree.

In this video he graphs the z wrong AF. The zero point for z should start at the xy intersection and count up from that spot. He explains it correctly but then he draws it as tho the z is counted up from the point 0, 0 on the x y axis, which is completely wrong (unless the x and y actually are both 0) and looks weird.

@@chaoticrampage7946 right! My teacher made us do the normal grid, but with an extra line influencing the 2nd (positive,positive) and 3rd (negative,negative)and intersects through (0,0). this new line will now be x, the line that used to be x is now y, and the line that should have been y is now z.

It does not add up. I looked at some other videos and found out why. He made a mistake on this one for sure.

No it wasn’t. It’s correct. Please look again.

@@MathAndScience the segment joining (0,0,0) and (3,4,0) and the segment joining (0,0,5) and (3,4,5) seems not parallel

Done subscribing your you tube channel today!

Yeah that is more in the realm of calculus 3. I'll do more lessons on those systems in the future!

It also bothers me but than I remember that The US still uses Imperial system even though it also doesn't make any sense

engnrng

Thanks so much!

Thanks Roy. I know how it works :) I am drawing by hand and the drawing isn't to scale. I think I got the point across though, which was to show how a function of two variables is plotted on a 3D graph. I am not a computer as I am drawing by hand - thanks and good luck in your studies. Jason

Jason, if you look at timestamp 30:10 you have the only video that does not show a 3D box. This is the first video I saw on 3D graphing and I had to find other videos to learn how this works. I have more respect for you than you know but I think this time you should take a closer look at what I'm saying. It needs to be corrected. But if not then OK. I still love you :) and I'll say thank you very much for the lessons on Sin & Cos. 👍✌

I just saw one without the box, Professor Leonard. He showed a diagonal line from (0,0,0) to the corner of the square on the (X,Y) plane. Then on the Z axis at the measurement drawing a line parallel to the new diagonal reference line. Then a vertical line.

@@roysmith3198 Yes you don't need any box to graph in 3D - it is optional - I chose not to show box. You just need the x, y, and z axis.

Your a year older now, go watch it again and see if you can catch the mistake this time. It's very bad. Hint: it involves the Z axis.