Hi
Hope anyone can help.
When using this syntax in Maple 10:
>restart:_EnvAllSolutions:=true:
f:=(x,y)->x^3*y-2*x^2*y+x*y^3;
GRAD:=[diff(f(x,y),x),diff(f(x,y),y)];
STATS:=solve(GRAD,[x,y]);
I get the following output:
3 2 3
f := (x, y) -> x y - 2 x y + x y
2 3 3 2 2
GRAD := [3 x y - 4 x y + y , x - 2 x + 3 x y ]
STATS := [[x = 2, y = 0], [x = 0, y = 0], [x = 0, y = 0],
2
[x = 5/4, y = 1/4 RootOf(_Z - 5, label = _L2)]]

Hello,
I have tried to run the Maple 10 program on my Toshiba Tecra M4 TabletPC and it runs fine until I go to Tablet Mode. The only part of the program that will run in Tablet mode is the Classic Worksheet.
The symptoms are that the windows that appear in say the documentation mode (in Tablet Mode) come up but are solid gray. The program seems to hang.
Now what I mean by "Tablet Mode" is that you flip the touchscreen around and lock it on top of the keyboard. This cause the display to go from a horizontal presentation to a vertical sheet of paper presentation.
Regards,
Dave

Hi,
How to make surface plot from elements stored in matrix of form [x,y,z]?
Let's suppose I have the following matrix:
>A:=matrix([[1.00, 1.00, 167.76], [1.00, 2.00, 95.588], [2.00, 1.00, 500.64], [2.00, 2.00, 335.51]]);
The first argument from the lists is value for X axis, the second argument is value for Y axis and the third argument is value for Z axis.
For example:
x=1, y=1, z=167.76
x=1, y=2, z=95.588
x=2, y=1, z=500.64
x=2, y=2, z=335.51
How to make such plot in 3D?

Is Maple 10's logical system called a three valued one simply because of the value FAIL, in addition to the truth values true and false ?

I've already bothered two other forums with this (retarded?) question, but I'm not getting any answers. So I'm bothering you now. I apologize. I tried to search but didn't find anything. The problem is I'm not able to type ^ or input superscripts in Maple 10.02. I'm using FVWM2, but the problem occurs in KDE, too. Maple clearly gets some input, but is it not visible, and it doesn't have the same effects as a caret does. Maple displays letters with carets like ô fine, but not the caret alone, nor does Maple indicate I'm writing a superscript. And I can type anything, but the first character after inputting a caret doesn't get shown, and I get no superscripts. For example, typing "x^22" is "x2" on the screen. While Maple clearly indicates that I'm about to write a subscript if I've entered an underscore.

Does anyone know how to display "infinity symbol" in Label element in Maplet?

Hi,
I am trying to do define a matrix of differential operators
for e.g
|diff((),x) , 0 |
| 0 , diff((),y)|
|diff((),y) , 0 |
| 0 , diff((),x)|
once this 4x2 operator is defined i can apply it to any function of two variables f(x,y) or a compatible(in size) matrix of such functions. How can I define such an operator in maple?
Thanks,
saurabh

Hi Maple'primes.
I have a question that I am sure has been posted many times but I will do again. I am using Maple 10 and I am trying to sweep over a parameter space with a for loop. At each iteration of the loop I am performing a complex calculation : double/triple integral or solving a boundary value problem. If I compute the compuation as a stand alone execution then it take ~ 30 sec, however, when I loop through 200 iterations the loop never finishes and Maple tells me I am out of memory. When I look at the memory (bottom right hand corner) it keep increasing to crazy levels (Gigs) during the loop, when each computaion should be about 20M. It seems like Maple keeps track of all the old computations when I clearly don't want it to. How can I speed this up?

Hi,
I have a matrix containing data read from an external file. I would like the user to select a colon number using a List box and, based on this number, build the resulting vector from the matrix. Is it possible to ask Maple to evaluate some parts (execution groups?) of a worksheet with some command (not menus)?
Thanks.

How do I generate a datafile (ascii-type) for the following general case:
y1:=f1(x);
y2:=f2(x);
...
ym:=fm(x);
so that the first column will contain selected values of x from x0 to xN, the second column will contain the corresponding f1(x0..xN), the third f2(x0..xN) etc.?
Thanks, Miran

I try to calculate a numberical integration in 2 layer for loops(outer 21 times, inner 128 times):
evalf(int(erfc(sqrt(B*xgms1*x/(x*xgmi1+xgmn1)))/gamav*exp(-1*x/gamav),x=0..infinity)), i.e., the kenerl is erfc(ax/(cx+d))×exp(-ax). But when "gamav" > 100000, the calculation time is too long to bear. So I try to do some approximation and change the upper bound into 10*gamav, 30*gamav, 50*gamav and 100*gamav. But I got the following results:
BER1a1[18]=0.0001004773804,
BER1a2[18]=0.0000365034983,
BER1a3[18]=0.0000000096250,
BER1a4[18]=0.0000000000001.
The trend of results is bigger the upper bound smaller the results. Obviously, the results is wrong. When "gamav" is a smaller number, such as 1000, the four integration results is the same as when the upper bound is "infinity".

Hello! I would like to do something that I really think should be simple.
Suppose I have a polynomial
P := x^2 + y
If I want to evaluate it at the point [1,2], I could say:
eval(x=1,y=2,P);
But suppose that I didn't know the form the variables in the polynomial would take. Or suppose that I knew they were of the form x1,x2,x3,...,xn.
Given a vector of size n, how can I evaluate my polynomial at that point?
Thanks!
Susan

Hi.
Anyone knows a command on how to calculate the norm (length) of a vector?
For example:
Maple input:
START
>restart:with(linalg):#I know this package is obsolete, but my Teach only teaches theese commands..
>u:=vector([1,1,1,1]);#a vector i defined
>LengthU:=sqrt(u[1]^2+u[2]^2+u[3]^2+u[4]^2);#This is how I calculate the length theese days...
END
Anybody knows a command, so that my third line will not be neccesary?
TIA

Hello members,
My question is out of maple primes, but i was wondering if one of the members is and expert in MATLAB coding.
I am trying to write a MATLAB code for numerical integration for a double exponential equation of the form
i = io(exp(-alpha*t)-exp(-beta*t). The problem i am facing is how to eliminitate the error as the integration is taken as the area under the curve, say from time t=0.0 to t=25e-6.
Your comments in how to solve this problem is highly appreciated.
Regards,
JacquieD.

Many Maple users have a preference of user interface, whether it be command line (TTY), Standard (Worksheet or Document mode), or Classic. My personal view is that each may be suited for different types of task. While it's understood that Maplesoft is dedicated to supporting the Standard interface, I understand that some users remain devoted to the Classic interface.

I often use Maple 10 on a 64bit Linux machine, on which the performance of the 64bit Maple 10 kernel is comparatively faster for some types of computation. I discussed this briefly in an earlier post. But there is no officially released 64bit Linux port of the Classic interface. So below I'll mention an unofficial and unsupported way to use the 64bit Linux Maple kernel with the 32bit Linux Maple Classic interface.