Hi,

PredictorEstimator := diff(X(t), t) = A.X(t)+B.U+L.(Y-C.X(t)-D.U)

If I want to collect the X(t) in the above non-communative equation, which maple command should I use?

Regards

 

I created two Maple animations in Maple 13 using the command "animate", which I then call with "display". The application works wonderfully. Now I am trying to create a Maplet around this program, and am having trouble finding any information or examples in the Help menu on how to create play buttons and whatever else is needed to successfully make this work. If you could give me some guidance or point me to an example somewhere that would be greatly appreciated.

hello could u help me with this error printf(cat(`$`(`%12.5 f`, 4)), `$`(vij(1, 1)[k], k = 1 .. 4)) Error, (in fprintf) unknown format code ` ` THANKS

r''-r(phi'^2+sin(phi)^2 theta'^2) -e^-r^2 = 0

Do you have any idea how to solve that ode?

I tried the following:

q:=(x)^(2)=a;
assume(0<x,0<a);
solve(q,x);
 

and received two solutions, though I assumed x and a to be positive.

Why? And what can I do, to make Maple account for my assumptions and only return the one possible solution?

I think, it's a simple trouble, but I can't solute it. Help me, please restart; > PDE:=diff(T(x,t),t)=5.71*10^(-6)*diff(T(x,t),x,x); > BC:={T(0,t)=500*(1-t/1200)^10+1000,T(x,0)=1500}; > SOL:=pdsolve(PDE,BC,numeric,timestep=50, spacestep=1/200); > SOL:-plot3d(x=0..0.25,t=0..1200); Error, (in pdsolve/numeric/par_hyp) must specify time variable using 'time=varname' Error, `SOL` does not evaluate to a module

I was doing a procedure for my programming class that classifies triangles.

I got the error "invalid terms in product"

I was wondering if anyone knew what that error means? I emailed my professor but he hasn't emailed me back.

 

Thanks,

Lex

hello,everyone,who can introduce the use of "free motion" component?

Hello, everyone.

Here is a simple question.

How can I solve an equation containing a logarithmic function, for example:
eq:={40=53802.8616296/V-4421522.681759509154376431238971030890884/V^2-34696412.12593013477367899170424836286055/V^3-68770455564.45999796126160810938763183857/V^4+403332559275.4141930212434442368214769780/V^5+958128028485.0130104382506076504882209562/V^6-26140204752481.13476652750626233649550628/V^7+17375263330.60863159106251286006887257238*ln(V)/V^4,1258*0.9<V<1258*1.1}

 

I have a set of PDEs & I tried to solve it. First of all I defined some functions as:
H := (diff(a(t, y), t))/a(t, y), Hy := (diff(a(t, y), y))/a(t, y), H1 := diff(H(t, y), t), a1 := diff(a(t, y), t), a2 := diff(a1, t), Hy1 := diff(Hy(t, y), y), ay1 := diff(a(t, y), y), ay2 := diff(ay1, y), n1 := diff(n(t, y), t), n2 := diff(n1, t), ny1 := diff(n(t, y), y), ny2 := diff(ny1, y), pef := -2*n(t, y)^2*Hy1-3*n(t, y)^2*Hy^2-n(t, y)*ny2-2*n(t, y)*Hy*ny1-2*H(t, y)*n1/n(t, y), `ρef` := 3*n(t, y)^2*Hy1+6*n(t, y)^2*Hy^2, `ωef` := pef/`ρef`,

I'm looking for the correct word usage:

 

"There's an online ____ that mocks the lack of objectivity in philosophy"

That ____ is the following:

The dean addresses the physicist: "Why do I always have to give you guys so 
much money, for laboratories and expensive equipment and stuff. Why couldn't 
you be like the maths department - all they need is money for pencils, paper 
and waste-paper baskets. Or even better, like the philosophy department. 
All they need are pencils and paper." 

What word is ____ ?

Hi,

i need to fourier transform 2D data to obtain spectrum.

I have 2 columns time ans intensity in that time. in another words i need to

FT(Y(X)), where X,Y are vectors.

 

i tried fft(2,x,y,) but theres no x(y)

 

can you please help me? I.m newbie in Maple and i need a fast solution:(

 

thank you

M

Error, (in dsolve/numeric/process_input) received more than one indication of the dependent vars [Cr(t), chp(t), Csp(t),Cpp(t),Cl(t)]