Matlab Question - Tilted Forum Project Discussion Community

Rekna · 02-26-2005, 11:14 AM

I have data for a 3 dimensional gird in a data file as X Y Z pairs How do I plot this as a 3d mesh?

vinaur · 02-26-2005, 12:47 PM

Are you doing it on a calculator or a computer?

Rekna · 02-26-2005, 04:08 PM

computer, I have a generated datafile of X Y Z pairs

specifically r, theta, f(r,theta) (where f is unknown but found via finite difference methods).

I'd like to plot a mesh that has two independent axis, one for r and one for theta and then a dependent axis for f(r,theta).

here are a couple lines from the datafile

1 0 21.4417
1 0.314159 -102.989
1 0.628319 -217.197
1 0.942478 -310.002

Hain · 02-26-2005, 07:26 PM

This sounds like a question for the Tilted Computer peeps.
If you are given the function in terms of r and theta, not these sets of data points, I suggest downloading a graphing calculator from Pacific Tech. It is able to create any graph you can think of using.

kolila · 02-26-2005, 08:46 PM

i dont know about matlab, but i use maple and it tells you how to do this in help.

Rekna · 02-26-2005, 09:57 PM

I'm not given the function, i'm given a dirichlet and neumann boundry condition on a grid and am solving for the interrior points. I'd like to take these points and plot them on a mesh/countur plot ect. Unfortunatlly maple doesn't let me export eps files. I'll keep looking online i'm sure i'll find something soon.

Rekna · 02-26-2005, 10:34 PM

I found a way to do it, I also just realized I posted this in tilted knowledge when I meant to post it in tilted programming

FloydianOne · 03-01-2005, 05:20 PM

Can you tell us how to do it? Ive been teaching myself matlab, taking a digital signal processing course right now....

Is the way you did it similar to this?
http://geology.asu.edu/glg410/lectures/L34_Matlab5.html

phukraut · 03-01-2005, 06:43 PM

Hm.. Maple 8 does export to EPS. At least on plots. And can produce LaTeX output, which can easily be converted to EPS.

Glad you figured it out anyway.

Rekna · 03-06-2005, 11:39 AM

I used this guide here

http://www.mathworks.com/matlabcentr...bjectType=file

pig · 03-07-2005, 09:44 AM

rekna,

have you figured this out yet? i would check out surf and 3dplot, i believe, and be wary of your axes - matlab likes to take them counterintuitively for some 3d plotting functions, as i recall.

02-26-2005, 11:14 AM	#1 (permalink)
Rekna Junkie	Matlab Question I have data for a 3 dimensional gird in a data file as X Y Z pairs How do I plot this as a 3d mesh?

02-26-2005, 07:26 PM	#4 (permalink)
Hain has a plan Location: middle of Whywouldanyonebethere	This sounds like a question for the Tilted Computer peeps. If you are given the function in terms of r and theta, not these sets of data points, I suggest downloading a graphing calculator from Pacific Tech. It is able to create any graph you can think of using. __________________ ////\\// IRONSKY.NET \\//\\\\

03-07-2005, 09:44 AM	#11 (permalink)
pig pigglet pigglet Location: Locash	rekna, have you figured this out yet? i would check out surf and 3dplot, i believe, and be wary of your axes - matlab likes to take them counterintuitively for some 3d plotting functions, as i recall. __________________ You don't love me, you just love my piggy style

02-26-2005, 12:47 PM	#2 (permalink)
vinaur Insane	Are you doing it on a calculator or a computer?

02-26-2005, 04:08 PM	#3 (permalink)
Rekna Junkie	computer, I have a generated datafile of X Y Z pairs specifically r, theta, f(r,theta) (where f is unknown but found via finite difference methods). I'd like to plot a mesh that has two independent axis, one for r and one for theta and then a dependent axis for f(r,theta). here are a couple lines from the datafile 1 0 21.4417 1 0.314159 -102.989 1 0.628319 -217.197 1 0.942478 -310.002

02-26-2005, 08:46 PM	#5 (permalink)
kolila Upright Location: canada	i dont know about matlab, but i use maple and it tells you how to do this in help.

02-26-2005, 09:57 PM	#6 (permalink)
Rekna Junkie	I'm not given the function, i'm given a dirichlet and neumann boundry condition on a grid and am solving for the interrior points. I'd like to take these points and plot them on a mesh/countur plot ect. Unfortunatlly maple doesn't let me export eps files. I'll keep looking online i'm sure i'll find something soon.

02-26-2005, 10:34 PM	#7 (permalink)
Rekna Junkie	I found a way to do it, I also just realized I posted this in tilted knowledge when I meant to post it in tilted programming

03-01-2005, 05:20 PM	#8 (permalink)
FloydianOne Crazy	Can you tell us how to do it? Ive been teaching myself matlab, taking a digital signal processing course right now.... Is the way you did it similar to this? http://geology.asu.edu/glg410/lectures/L34_Matlab5.html

03-01-2005, 06:43 PM	#9 (permalink)
phukraut Addict	Hm.. Maple 8 does export to EPS. At least on plots. And can produce LaTeX output, which can easily be converted to EPS. Glad you figured it out anyway.

03-06-2005, 11:39 AM	#10 (permalink)
Rekna Junkie	I used this guide here http://www.mathworks.com/matlabcentr...bjectType=file