Hallo Everybody,

I hope someone can help me.

I want to solve numerically the diffusion equation,

          diff(csh(rh, t), t) = Dif*(diff(rh^2*(diff(csh(rh, t), rh)), rh))/(r0*rh^2)

          where "Dif" is the diffusivity and "r0" is the initial value of rh (the equations were normalized).

subject to the following boundary and initial conditions:

In Classic, this input:

753406.29+42098.70;

yields this output:

795504.99

But in Standard, the same input yields

7.9550499 10

How do I set my options in Standard so that the output format is like it is in Classic?

I poked around "display options" etc. but did not find anything.

 

If I have some element tau in my matrix, how do I declare it to be real?

 

> with(LinearAlgebra);
> A := `<|>`(`<,>`(-sqrt(5/3)*tau, -tau, 0, 0), `<,>`(-tau, -sqrt(3/5)*tau, -2*tau/sqrt(15), 0), `<,>`(0, -2*tau/sqrt(15), sqrt(3/5)*tau, 0), `<,>`(0, 0, -tau, sqrt(5/3)*tau));

 

The time function doesn't seem to be working consistantly.

Following the example in the help page for the time() function I can't get as low as .041.  The best I get is .046 and sometimes .047 .062 and .063.  Are there services running in the background that can affect the run performance like a firewall for example?

Can anyone else get .041?  For comparison I'm using a P4 - 3 GHz. and 2.5 Gb RAM @ 533 MHz. with 48 processes running in the task manager.

So I'd like to take two ranges of numbers and simlify their combination.  Example:  RealRange(2,5) union RealRange(3,6) should yield RealRange(2,6), but the union function doesn't accept RealRange data types as its argument.   Is there an available command that will produce the desired result?

Dear All, I'm trying to substitute a series ansatz into a coupled couple of equations to find coefficients. The equations are quite cumbersome, but the principle shouldn't be too difficult. The equations are f3A(alpha,mu,Omega,delta,m) =0 f4A(alpha,mu,Omega,m) = 0 where f3A and f4A are complicated functions of the several variables. The region I'm working in is delta=0, m=1 Now, I have reason to believe that the following ansatz will work: alpha = A0 + A2/Omega^2 + A4/Omega^4 +.... -mu=M0 + M2/Omega^2 + M4/Omega^4 +.....

I recently upgraded to Maple 12 from Maple 11 and it seems that I have lost the ability to browse the contents of a matrix.  In Maple 11 I was able to right-click on the matrix block and use the context menu to open a tabular view of the data.  In Maple 12 I get a context menu with "Explore" as an option but it yeilds a dialog having a single button in it which also reads "Explore."   Clicking this closes the dialog.

Does Maple 12 have any capability for quickly browsing the contents of a Matrix?

i do:

int(ln(k3+r)/r^2,r);

i get:

either 1/k3*ln(r)-ln(k3+r)*(k3+r)/k3/r

or 1/k3*ln(-r)-ln(k3+r)*(k3+r)/k3/r

the expected behaviour would be to always get the absolute value inside the ln

I'm looking for the greatest integer function in Maple.  I.e., [x] is the greatest integer < = x.  What does Maple call it?  What is the syntax?

Alla

The omexample.c file for calling Maple from C has no make file.

The READEME.txt file in the directory containing omexample.c suggests: "Refer to ?OpenMaple,Examples"

The result of  "?OpenMaple,Examples" does not seem to explicitly specify the required magic to make things work...  Following what appears to be intimated, I typed (to bash):

export MAPLE=/home/dpaddy/bin/maple12

export LD_LIBRARY_PATH=$MAPLE/bin.X86_64_LINUX

In plotting two functions on the same plot, is it possible to specify two domains, one for each function?

Alla

I want to put in the plus or minus symbol (+/- in ASCII) into a text region (standard math), as in the quadratic formula.  I am using the classic interface in version 9.5.  Can this be done?

Alla

For the commands  Digits:=20;  identify(evalf(k/Pi^4));

I get the closed form result with k=105 but not with k=104 or k=106.  I have tried to understand this behavior from looking at the identify help page but haven't figured it out.

Hi all

I'm using the SOLVE (Maple11) function to solve inequalities: solve({f_1(x,y,z)=0, f_2(x,y,z)>=0, f_2(x,y,z)<=1, f_3(x,y,z)>=0, f_3(x,y,z)<=1}, z);

Thus, I have 3 equations with 3 variables (x,y,z) and I have 5 constraints (4 inequalities and 1 equality).

Maple gives me the following result:

A piecewise function where the components are a plane equation in regarding the 5 constraints and no solution otherwise. (See the picture)

The command collect( u*(u[t]+1), [u, u[t]], distributed); is not giving me the expected result u+u[t]*u but the error message Error, (in collect/series) invalid expression for series