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David Arnold


College of the Redwoods

Last seen: 3 years ago |  Active since 2011

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Answered
How can I plot an intersection volume?
Here's a helpful starting image: We can see that tan(phi)=1/sqrt(3), so phi=pi/6. Now, here's my code to draw the region usin...

6 years ago | 0

Question


Drag a point on a curve
Here is my code: xmin=0;xmax=3; ymin=0;ymax=3; x=linspace(xmin,xmax); y=1/3*x.^2; plot(x,y) hold on ...

6 years ago | 1 answer | 0

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answer

Question


Quiver vector length difficulty
I've written this: [T,Y]=meshgrid(-4:0.5:4,-4:0.5:4); S=-(2-Y).*Y; L=sqrt(1+S.^2); quiver(T,Y,1./L,S./L) axis t...

7 years ago | 1 answer | 0

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answer

Question


dfield8 on Matlab2017b
Anybody have a version of John Polking's dfield8 that works on Matlab 2017b?

7 years ago | 1 answer | 0

1

answer

Question


Using a mupad plot command from the Matlab console
Is it possible to use a mupad plot command from the Matlab console or editor? I tried: evalin(symengine,'plot(sin(x),x=0...

11 years ago | 1 answer | 0

1

answer

Question


Undocking a mupad plot
Hi, I am brand new to Mupad, reading the documentation, trying examples. I'm thinking about using it n the classroom, but ...

11 years ago | 0 answers | 0

0

answers

Question


Deleting commands for running function in editor
Version 2012b on Mac Snow Leopard 10.68. I don't seem to be able to delete commands from the run icon for running a function ...

11 years ago | 0 answers | 0

0

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Question


Substitute an array of number for a symbolic variable
Hi, I have: syms x y f=x^3+y^3+3x^2+2y^2+9 fx=diff(f,x) now, I'd like to substitute these two vectors of x and ...

12 years ago | 2 answers | 0

2

answers

Answered
Plot contours at a level I wish
Excellent! May I ask one more question? When I change the paper size and position, then rotate the view, the axis labels (in thi...

12 years ago | 0

Question


Plot contours at a level I wish
All, I have the following code: close all clc N=linspace(10,110,40); P=linspace(10,70,40); [N,P]=meshg...

12 years ago | 2 answers | 0

2

answers

Question


helpdesk font
Hi, When I open helpdesk, the font is too small for me eyes. I tried the various font options in preferences, but the helpdes...

12 years ago | 0 answers | 0

0

answers

Question


Bifurcation GUI
All, I've written a little gui to show the bifurcation that occurs as H increases in the differential equation involving logisti...

12 years ago | 0 answers | 0

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answers

Question


Bifurcation GUI
All, Has anyone done a bifurcation gui in Matlab, something along the lines of: http://demonstrations.wolfram.com/Bifurcat...

13 years ago | 2 answers | 0

2

answers

Answered
Exporting image to bounded pdf
I want to thank everyone for their help on this question. I am now going to close the question. Thanks so much. David.

13 years ago | 0

Question


Exporting image to bounded pdf
If I do this: set(gcf,'PaperPosition',[0,0,4,3]) print -depsc2 filename.eps I get a nice image I can include in a latex d...

13 years ago | 4 answers | 0

4

answers

Question


Subbing into a constant function in symbolic toolbox
All, This doesn't work. syms x y f=3*y^2-2*y^3-3*x^2+6*x*y; fx=diff(f,x); fy=diff(f,y); fxx=diff(f,x,2)...

13 years ago | 1 answer | 1

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