I am currently studing mass transfer (chemical engineering major), there is an equation that we need to plot to solve the problem. The equation is attached below.

When I use maple to plot this equation, it always come up "Warning, unable to evaluate the function to numeric values in the region; see the plotting command's help page to ensure the calling sequence is correct". Does anyone know how to plot this equation? Thank you very much for your help.

http://math.stackexchange.com/questions/376240/how-to-calculate-grobner-basis-for-syzi-f1-f2-g1-g2

http://math.stackexchange.com/questions/376980/why-syz-algorithm-for-module-have-dimension-problem-how-to-divide-vector-and-mu

Dear guys,

I have a question regarding calculation of a Gradient.

I am the lucky owner of the following equation:

Hi,

I have a second order differential equation

d2y/dt2 = -6.478831125*sin(y)

to be solved numerically. I've successfully been able to solve it using the 4th order Runge-Kutta method, however it is not properly written as a procedure and I'm unsure of how to do this.

So far I have:

R:= -6.478831125
z[0]:= 0:
y[0]:= Pi/2:
h:= 0.01:
t:= 10:
for i from 0 to t-1 by 1 do
c0:= evalf(h*R*sin(y[i])):
k0:= evalf(h*(z[i])):

For the equation x'(t)=F(z), z=(x,y), with the vector field

F(x,y)= [- x(x^4 + y^4) - y,  x  - y(x^4+y^4)]

prove that the origin is an attractor in the future, i.e., every solution verifies:

limit as t goes to +infinity of z(t) = 0

I need to format my answer as a regular mathematical proof.

Any ideas?

hallo guys,

my goal: i wanna create some buttons and scale and position them individualy. like i can do in any visual IDE.

Could some one help me with some example code, showing how to create a button on a specific position, maybe load a picture on the button if it gets pressed?

thx in advance

Hello guys ,

i have a complicated function , i found its roots but when i evaluate function by its roots , the result is not zero !!!

thank you for your helpWork.mw

An attendant at the zoo has a bag of peanuts to feed the monkeys. If the nuts are shared equally among the

7  monkeys in the first room, or among the 11 monkeys in the second room, there will be 3 nuts left over. If the nuts are shared equally among the 13 monkeys in the third room, there will be 10 nuts left over. but if the nuts are shared equally among all the monkeys in all the three rooms, there will be none left over. how many peanuts does the the attendant have?

Hi,

I'm trying to make a phase plane plot for the Lorenz system of differential equations around the equilibrium point (0,0,0) but when it keeps coming up with an error, saying it's "unable to obtain field plot, additional unknown(s) found: xy"

Any idea where I'm going wrong? Any help would be greatly appreciated!

Katie

sys1 := [diff(y(x), x) = a/(1-y(x))^b+c*exp(-d*x)/(1-y(x))^2]:

dsolve(sys1)

but the result is empty.

What can I do?

Hi all,

Is there any way to fill in colour to a polar plot using Maple 16? What I want to do is essentially make a coloured in pie slice using a defined radius and theta range.

I am aware of the function filled, which adds colour starting from the x-axis but that is not appropriate in this situation. I know of the filledregions function but that only works for implicit and contourplot, and as of yet I have not been able to use implicit...

g1 := [0, y, x];g2 := [0, y^2-x-y, 0]; g3 := [x, x+y, 0]; g4 := [y, -y, 0]; g5 := [0, x*y+x/2+y/2, 0]; g6 := [0, x^2-x/4-y/4, 0];

g1 := 0; g2 := 0; g3 := x; g4 := y; g5 := 0; g6 := 0;

restart; with(Groebner):

IsNullZero := proc(tau) if assigned(tau) then return tau else return 0 end if end proc;

Which command is similar with IsNull function in VBA for assign 0 when detect not assigned

I want to find shortest time it takes particle to travel from point A(0,0) to B(1,1). I tried to solve this problem by using following code test.mw. I know that solution to this problem is cycloid and i already found its equations in parametric form.

My problem is that when i try to solve integral as a solution i receive Time := Float(infinity)*I.

Is there any way to get a numeric solution in Maple...

Are There  options to solve this problem?

I solved a PDE system and got module() export plot,plot3d,animate,value,settings; ... end module (Got ui(x,t) and ur(x,t))
And after it I try to solve the task
Xs := [0, .175, .789, 1.818, 3.287, 5.183];
n := 1;
interface(prettyprint = 1);
for t1 from 0 by 50 to 50 do
k1 := sol:-value(t1, output = listprocedure);