(i^2+i*alpha+i*beta+i)*Q(n)+((-x*alpha-x*beta-2*x+beta-alpha)*n-x*alpha-x*beta-2*x+beta-alpha)*Q(n+1)+((1-x^2)*n^2+(-3*x^2+3)*n-2*x^2+2)*Q(n+2) = 0

After using diffeqtorec, there is n in coefficient, if multiply x^n/n! to all terms, i can not convert some to exponential function due to n^2, n and the difference of outer coefficient n not greater than n+2 in Q(n+2)

as i do not know the initial condition of above formula, differential equation is no use.

Hi! I need some help with a curve I'm trying to plot.

I'm asked to intersect the surface produced by f(x,y) with the plane z=1/4 and to plot the curve generated by the intersection (in 3D). I found how the curve looks like but I don´t know how to plot that in 3D.

And so with this provocative title, "pushing dsolve to its limits" I want to share some difficulties I've been having in doing just that. I'm looking at a dynamic system of 3 ODEs. The system has a continuum of stationary points along a line. For each point on the line, there exist a stable (center) manifold, also a line, such that the point may be approached from both directions. However, simulating the converging trajectory has proven difficult.

I have simulated as...

hi

I want to have a fprint command which should given me the data in two columns.

I want to modifiy the following command

fprintf(fd,"%f \n",li,sigmai);

this command gives me data in horizental form, i.e.,

0.001000 0.300990 0.600980 0.900970 1.200960 1.500950 1.800940  2.100930

But i want it in the follwoing form

 li              sigma

0.001000 0.300990

 0.600980 0.900970

I am on maple 12 and this is not working.

My programming skills are very limitied but now that I see roughly how to do this (thanks to everyone on here) I can try and tweak it in roder to make it work.

As for the sequence...it isnt as nice as it looks, the pattern doesnt continue.

Is there a command to change differential equation into difference equation?

i set up maple 14 on win 7 64 bit,  maple 14  opens but codes don't  work. how can i solve this problem? 

I am interested to know how the find the maximum value in a function of f(x,t) over an interval {x=a..b, t=c..d}. I have searched this forum and the web and can not find anything to do it.

I have plotted the function and can visually see the maximum, however, although I have tried many methods I can not calculate the maximum value.

Any assistance would be appreciated. If possible, I would also like to calculate the mean and minimum value for the function.

Hello All,

How may I have Maple accept and output J, rather than I, for imaginary numbers?

Thanks,

Dave

Hello All,

Are there keyboard shortcuts for pi and e? It's quite inconvenient to pull these from "Common Symbols". Thanks!

Regards,

Dave

When an existing .mw file is opened in Maple 15 (i.e. by double clicking the file in Windows Explorer), a new document is always opened automatically alongside the existing file, and a "Startup" dialog pops up asking the user to select "Document" or "Worksheet" mode. I think this is annoying because each time the user needs to close the dialog to get to his/her .mw file.

This behavior did not occur in Maple 14 and I don't understand the reason for this change. Can we go back to the previous behavior?

For the following system:

x1 := M*(cos(phi)-a*cos(phi)) / (1-b*cos(2*phi))

x2 := M*(cos(phi)+a*sin(phi)) / (1+b*sin(2*phi))

y1 := M*(sin(phi)+a*sin(phi)) / (1-b*cos(2*phi))

y2 := M*(sin(phi)+a*cos(phi))/ (1+b*sin(2*phi))

I'm solving for M(x1,x2,y1,y2), eliminating a, b, and phi. 

I've tried

solve({x1=X1, x2=X2, y1=Y1, y2=Y2},{M,a,b,phi},AllSolutions);

and

sol := eliminate({x1 = X1, x2 = X2, y1 = Y1, y2 = Y2}, {M, a, b, phi});

int(int(int(max(x^2,y^2,z^2),x=-1..1),y=-1..1),z=-1..1) with Maple?  The same question in higher dimensions.