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# David Arnold

### College of the Redwoods

18 total contributions since 2011

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Notes for Linear Algebra using Matlab
Lecture notes for Linear Algebra using Introduction to Linear Algebra with Applications by DeFranza and Gagliardi.

Submitted

Notes for Differential Equations using Matlab
Examples from Differential Equations by Polking, Boggess, and Arnold

How can I plot an intersection volume?

1 year 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 ...

2 years ago | 1 answer | 0

### 1

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...

2 years ago | 1 answer | 0

### 1

Question

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

2 years ago | 1 answer | 0

### 1

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...

6 years ago | 1 answer | 0

### 1

Question

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

6 years ago | 0 answers | 0

### 0

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 ...

6 years ago | 0 answers | 0

### 0

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 ...

7 years ago | 2 answers | 0

### 2

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...

7 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...

7 years ago | 2 answers | 0

### 2

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...

8 years ago | 0 answers | 0

### 0

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...

8 years ago | 0 answers | 0

### 0

Question

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

8 years ago | 2 answers | 0

### 2

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.

8 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...

8 years ago | 4 answers | 0