Recent content by enceladus_

I have found this code from another site: xmin = -2; xstep = 0.1; xmax = 2; ymin = -2; ystep = 0.1; ymax = 2; x = xmin : xstep : xmax; y = ymin : ystep : ymax; [X,Y] = meshgrid(x,y); Z = 10*log10(abs(test(X + j*Y))); % here is the call to the function to be plotted. Z2 = abs(X + j*Y) <=1; %...

More so plotting in 3d, I've never used meshgrid or surf before. I do have access to the Symbolic Toolbox. Would I have to use BOTH meshgrid() and surf()?

Does anyone know how I might go about graphing the Z-Transform in 3D? It want it to look something like the picture below.

I'm doing Applied Mathematics and Computer Engineering double major. Maybe you can complete a CS Minor?

Many thanks, I was able to solve it!

It should be: -a1 +5b1 + a2 + 1 = 0 My mistake.

This system originates from systems of linear Diff Eqs. I am required to use the method of undetermined coefficients. -a2 + 5b2 - a1 = 0 -a2 + b2 -b1 -2 = 0 -a1 + 5b1 +a2 + 1 = 0 -a1 + b1 + b2 = 0 I can't figure out how I am able to solve this. In each case, I have two equations and three...

I understand I could graph this, but how would that help me?

No, it can't. I see what you're doing though, and its very similar to the method I am trying to use. In my method: y1 = y, y2 = y', y3 = y''...yn = y ^(n-1). From these: y'1 = y' = y2, y'2 = y'' = y3...y'(n) = y^n. This gives the system: y'1 = y2 y'2 = y3 My example from...

Your suggestion worked, I find it odd that leaving out x' makes it work though. The TI-89 can only do DE's up to the second degree. Would it help if I explained the method in full? Thanks for your help.

1. Is it possible for the TI-89 to solve Exact Equations? Ex: (2x-1)dx + (3y+7)dy = 0 I've tried various forms of input, but I cannot find a way for the Calculator to give me a complete answer. My best luck so far was: (2x-1)x' + (3y+7)y' = 0. The y' part was correct, the x' part was...

Thanks for that, very interesting.

Thanks again! :smile:

Ahh, I see. That makes a lot of sense. Can I also conclude that out bodies are experiencing gravitational waves from a wide variety of sources, and thus have our shape contorted on an unimaginably small scale? Thank you both very much :smile:

If two spinning, neutron stars in a tight orbit lose energy by giving off gravity waves, why don't other objects in orbit do the same? I don't understand what makes the two neutron stars unique. Why wouldn't the moon and the Earth give off gravity waves as well? I also know that the moon is...