Hello,

 

I'm a prime in maple, I have got a problem while trying to solve the following PDE system of equations

declare:=(T(x,y),v(x,y),P(x));
                  declare := T(x, y), v(x, y), P(x)

> sys1:=[10^6*v(x,y)*diff(T(x,y),x)-0.1*diff(T(x,y),y,y)-10^3*diff(v(x,y),y)^2=0,diff(v(x,y),x)=0,-diff(P(x),x)+10^3*diff(v(x,y),y,y)=0];

>IBC = {v(0, 0.2) = 150, v(0, -0.2) = 150, T(x,0) =400, T(0,0,2) =300,P(0.3)=0.1 };

I have some 'discrete' data which I wish to analyze with Maple.  For example, I have

Hi experts, I want to make a loop. Each time the function f should be changed according to n and m. The values that I obtain with Powell (not important for the undertstanding of the problem) should be put into the matrix A[n,m] > List := Powell(f, Xmin0); [-587.000914326964951, [-0.344030213998255226, 100.344030214880177], 12, 134] > m:=1; n:=1; for n to 3 do for m to 3 do end do end do; m:=m+1; n:=n+1; f := proc (Q1, Q2)->m*Q1+n*Q2 end proc; A[n,m]:=Powell(f); # not important for the understanding of the problem

Hi,

in Maple 12 (worksheet mode), the box Maple draws around a plot to allow the user to resize the plot using the mouse appears in all my plots far too big if I label the axis. Before labelling the axes, the box has the appropriate size, but as soon as I label the axis, the box becomes far too big resulting in my plot being very small while the bos goes from one end of the screen to the other.

Any help on that?

Thank you very much in advance,

Ben

Hi,

 

in Maple 12 (worksheet mode), the tickmark-option does not work: I enter in a plot3d-command (this command works otherwise) axis[3]=[tickmarks=5] in order to get 5 divisions on the z-axis.

 

The error message is "Error, (in plot3d) incorrect value for option gridlines: 5".

 

The workaround of tickmarks=[5,5,5] works. Other axis-options work, e. g. axis[3]=[color=green] .

 

Any help on that will be appreciated.

 

Many thanks in advance,

Ben

Hi, obviously a very simple question, but not for me: I plot 3 graphes into one plot by : plot1 := plot(pts, x = 0 .. 5, y = 0 .. 1000, style = line, color = red); plot2 := plot(pts2, x = 0 .. 5, y = 0 .. 1000, style = line, color = blue); plot3 := plot(pts3, x = 0 .. 5, y = 0 .. 1000, style = line, color = green); G := textplot({[1, 1, "function"], [.5, .75, "derivative"]}); display(plot1, plot2, plot3) I tried to use texplot to lable the achses but it did not work. Is there another way to do it?

 

I loaded a 1600*3 matrix into Maple 12  from my mysql datbase on my computer and it took 3 minutes to load it .

I assume that the speed will be increase significantly if I had a fast internet connection ( both up and down ).

My Internet connection (tcp / ip) is extremly slow !!    Is this correct ?   Are there any other way to speed up the data exchange ?

 

Hi experts, I am producing a List X[n]. After that I just want to plot the values X[n] := [n, P[n]] with n on the x axw and P[n] on the y axe. for i from .1 by .1 to 5 do n := n+1; P[n] := (i*2+3*i^2) X[n] := [n, P[n]] end do; X[1] Unfortunately I get the error message and an empty plot: 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

The Maple TA 3.0 equation editor seems to have fundamenal bugs that were present in earlier versions as well. For example, it does not accept obviously correct alternate versions of simple mathematical expressions:

Here is a bit of maple TA code that simply asks a user to enter an expression equal to what is displayed:

Hi,

I am a relatively new user of Maple, and I try to solve numerically the following PDE system :

> pde01 := diff(c(z, t), t) = (diff(c(z, t), z, z))-(diff(c(z, t), z))+k*(a-c(z, t));

> pde02 := diff(b(z, t), t) = (diff(b(z, t), z, z))-(diff(b(z, t), z))+k*(a-b(z, t));

> cl1 := c(0, t) = piecewise(t <= 0.3, 100, 0.3 < t and t <=0 .5, 200, 0.5 < t, 100);

> cl2 := c(l, t) = b(l, t);

> cl3 := (D[1](c))(l, t) = (D[1](b))(l, t);

> cl4 := b(L, t) = a;

I have a little problem. I have some linear unequalities and I wan't to prove if the following set is empty.
S:={(a,c) | (a-2*b-d+2*c)*delta <= d-c-a+b, a-b >= d-c, a>=0, b>=0}

b:=2;
d:=5;
delta:=2;

I have proved it like this:
solve({(a-2*b-d+2*c)*delta <= d-c-a+b, a-b >= d-c, a>=0, b>=0}, [a,c]);                  

 

please help me here:

i have

p(n):= (2310*n^5+5775*n^4+5019*n^3+(3507/2)*n^2+(409/2)*n+5/2)/(27720*n^7+97020*n^6+132300*n^5+88200*n^4+29400*n^3+4410*n^2+210*n)

how can apprximate p(n) with another polynomial (say: a second degree polynomial in n) or a rational function (ration of two second order polynomials) of less degree of n? and how good is that approximation

thanks in advance

My output consists of a lot of terms (100+) and I need to isolate all the negative (positive) terms. Can anyone help? Thank you in advance.

Hi can someone please help me . My program gives me the correct solution but it crashes afterwards. Can anyone tell me whats wrong with the program please.

 

(D^2y/dx^2 + x^2(y)^2=x, y(0)=y(2)=0 (1)
This is my task:
let :=(D^2y/dx^2)+x^2*(y)^2=x, y(0)=0,y'(0)=b (2)

plot the solutions to (2) for some b values of your choice. What does this tell you about the solution to (1)
so what does this tell me about my solution to (1)?
please could you explain clearly why you can conclude what you can so I fully understand?
many many thanks for your time and effort - much appreciated

I have plotted solution, and can see that for b close to -0.6, the graphs are very similar: