773 reputation
215
bio website msemac.redwoods.edu/~darnold/…
location Eureka, California
age
visits member for 1 year, 11 months
seen 8 mins ago

8h
asked Direction Field for an Ordinary Differential Equation
8h
asked Regarding Evaluated True
8h
comment Having difficulty with NDSolve
Thank you. You are very helpful.
10h
comment Having difficulty with NDSolve
@Szabolcs: I got the command ?Global* to work, but I've not been able to get the ?sym to work. Could you maybe send me a couple lines of code to try? For example, a=4, followed by ?Globala worked. Also, I've tried searching the documentation to find some help on these commands, but unlucky thus far. Could you point me to a location in the documentation? Thanks.
1d
asked The use of Evaluate in NDSolve and Plotting the answer
1d
comment Having difficulty with NDSolve
@xzczd: I went forward and read your help in Solving System of Nonlinear with Three Differential Equations. I want to thank you for donating your time to walk beginners like me through a wonderful step-by-step process. I learned a lot from your answer.
1d
comment Solving System of Nonlinear with Three Differential Equations
@xzcxd: I must say this an excellent answer, one of the most helpful I have read.
1d
revised Having difficulty with NDSolve
added 147 characters in body
1d
asked Having difficulty with NDSolve
Nov
10
comment Tailoring RegionPlot3D with PlotPoints?
@halirutan: Should AxesLabel->{x,y,z} be changed to AxesLabel->{x,z,y} in this image?
Nov
10
accepted Image Size using {w,h}
Nov
10
comment Image Size using {w,h}
Nice answer. Looks like this works as well: Framed@Plot[Sqrt[100 - x^2], {x, 0, 100}, PlotRange -> Automatic, ImageSize -> {500, 100}, AspectRatio -> Full]
Nov
10
asked Image Size using {w,h}
Nov
9
asked Draw a region bound by a sphere and a cylinder
Nov
7
accepted Adding walls to a region plot
Nov
7
comment Adding walls to a region plot
Absolutely what I needed for my students. Thank you so much.
Nov
7
comment Adding walls to a region plot
@rollyer: How can you make the fill drop to the xy-plane (at z=0 instead of at z=1).
Nov
6
asked Adding walls to a region plot
Nov
3
comment RegionPlot Difficulty
It was the second plot I wanted, I made a mistake in drawing the first plot. It should have just been ArcTan[y/x]. Now I am learning a bit more, as Limit[ArcTan[Tan[[Theta]]], [Theta] -> -Pi/2, Direction -> 1] gives a result $\pi/2$ and Limit[ArcTan[Tan[[Theta]]], [Theta] -> -Pi/2, Direction -> -1] gives a result $-\pi/2$. Things are beginning to make more sense.
Nov
3
comment RegionPlot Difficulty
Absolutely correct. Thanks for the observation and help.