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)]

hello how to make integration of a a matrix????????

I didn't use Maple TA myself, but I used a similar program, MyMathLab (from Pearson), and the main problem (and a question) that I have is following - entering any problem in MyMathLab (and Maple TA, I guess) verbatim in Wolfram Alpha produces the correct answer. So what is the point?

Test students' copying and pasting skills?

Alec

 

Hello All:

I have an if statement within a function. At some point, when the statement is evaluated I get an error message saying:

Error ...  cannot determine if this expression is true or false: 0. < 59.92088005+55.46829645*ln(.4804980261)

The right hand side is obviously greater than zero, but somehow maple does not seem to recognize this. Furthermore, this appears in the middle of a while do loop, and similar if statements are successfully evaluated with a true or false conclusion up until to this particular check point.

Need a sample maple code for a CSTR with heat exchange in unsteady state (for start up).

of a code which solves coupled nonlinear ODE's (stiff)

Thanks

How do I use the math tutor to plot on the same coordinate system?