Hi , 

 

 u(t-n*Pi)=0 if (t-n*Pi)<0

 u(t-n*Pi)=1 if (t-n*Pi)>=0

need to plot y(t) against t where t=0..30:

y(t)=sum(sin(t-n*Pi)u(t-n*Pi),n..infinity)

I appreciate 

Dear Colleagues,Surfing the web I found several applications in MatLab, which perform image processing. One of them caught my attention and challenge to reproduce in Maple.I attached the text of the original application and my attempt to play in Maple. I ask you your guidance, support and intervention to reproduce as faithfully as possible the original application. It was impossible on the final image point to the center of the circle and draw.I believe that together we can achieve...

 

How should I save my result-expression so as to be able to use it directly in other file without having to generate it again.

please help
regards,

Hi,

My work requires me to use derivative a lot. Especially, the partial one. Given F(x,x_dot). Maple has this partial expression, however I'd like to partial differentiate F with regard to x_dot (the derivative of x over time).

Is this possible? If possible, please tell me how.

Thank you.

Abe

i had a 15 set of nonlinear PDEs,i convert them to nonlinear set of ODEs, i try to solve them using the command dsolve(numeric) , but when solving i face this erroe :

Error, (in DEtools/convertsys) numeric exception: division by zero

what should i do?the problem is in my equations ? or what?

with regards,thnx. 

I have this csv file on my website (the file is hosted on dropbox.com) that I want to load into Maple:
Hence I type:

URL := "https://dl.dropboxusercontent.com/s/7fqalrdtn0c3r8u/Stockholm%20Stock%20Exchange%28Percentage%20Change%29.csv?token_hash=AAGxpzva90O6oNlLAie3T1h0UNP06I5EPg2qrROHMglRMw&dl=1":
HTTP:-Get(URL, 'timeout' = 100)

Then I get:

Error, (in HTTP:-Get) timed out waiting for initial response from server

If you past the url into...

Here is a relation: t[n+1]:=((a*n^2+a*n+b)*t[n]+c*(n^2)*t[n-1])/(n+1)^2

t[-1]:=0 and t[0]:=1

a,b,c are integers and a,b,c are from 1 to 20 and n is from 0 to 20

the series t[n+1] is integer

 

I want to know how to list (a,b,c) that satisfies the above. Please help!

 

 

 

I was using the Finance package and used the command ImpliedVolatilitySurface(...). But it is showing the following error 
"Error, (in Finance:-ImpliedVolatilitySurface) external linking: error loading external library finance.dll: The specified module could not be found."Please help..

Just wanted to let everyone know that the fix provided for the plotting problem discussed here is now available as a Maple 16.02a update.  This update will be available through Check for Updates and through the Maple 16.02a download page.

 

eithne

After solving a system of differential equations I got module. So I have a solution for the functions U1 (x, t) and U2 (x, t). Please tell me, how do I now get x * which corresponds to U1 (x *, 10) = max?Help please.

Hi,

I need help about this equation.

In geometry (2D), the triangle ABC has centroid is G(1, 1) and orthocenter is H(1,1). How to find the vertices A, B, C with the coordinates of this vertices are integers number?

Why is there a difference between pdetest and algsubs for a PDE?
Shouldn't pdetest work the same as algsubs for the example below?

restart: with(PDEtools):

Eq:=u(x,t)*diff(u(x,t),t)=0:

tmp:=sin(w*(c*t-x))-(1/4)*epsilon*c^2*cos(w*(c*t+x))^2+epsilon*c^3*w*cos(w*(c*t-x))*sin(w*(c*t-x))*t+(1/4)*epsilon*c^2*cos(w*(c*t-x))^2+(1/8)*c^4*epsilon^2*sin(w*c*t+w*x)+(1/8)*c^4*epsilon^2*sin(w*c*t+w*x)+(1/24)*c^4*epsilon^2*sin(3*w*c*t+3*w*x):

sol:=u(x,t)=tmp:

Is there any way to detect programmatically that a WARNING has been issued? A method that converts WARNINGs to errors would be acceptable.

Hi all,

restart:
a:=<1,2;3,4>;
whattype(a);
b:=Matrix(2,2,[1,2,3,4]);
whattype(b);
evalb(a=b);

Is there any real difference between these two methods of creathing matrices?

How do I check if two matrices are equal?

Thanks,

Casper