Hi

I have a Maple file which contains many proc loops and functions.

I need a linkage between some files to read the requested functions from source file and export calculations to another file.

Is it possible?

Hi,

When I show the context menu on maple 18 (CTRL click on mac or right click with a mouse) on an equation the system doesn't show the tutor or series options as written in the example I use.   (after having loaded the multivariate calculus as asked)

Is that an issue in my installation ?  Where do I have to place the cursor ?  Is the multivariate calculus module well loaded ?

Thanks for your help

Stéphane

Dear friends,

I would like to know the agorithm of isovle for solving 2 order equations for more than 3 variables.

I see that not all the solutions are shown for example for:

x^2+y^2=z^2+t^2

 Could you please help me with this?

hi,

I have bought maple18 student edition. I want to learn GPU programming through Maple. Please suggest how to do this. I have a notebook with i7 processor and NVIDIA geforce 750m graphics. I want to solve system of algebraic equations, integral equations etc in parallel using GPUs.

thanks

I am trying to simplify sums of a few LaguerreL polinomials of different n using the identities in the function advisor such as recurrsion relations. How does one go about in using the FunctionAdvisor identities when trying to simplify expressions containing orthogonal polynomials? 

Hello guys.

I have a system of differential equations , which I want to solve the perturbation method , but the following problem :

I got zero approximation 

SYS0 := dsolve({Sys, isc}, {delta0(x), u0(x)}, type = numeric, output = listprocedure)

SYS0:=[x=proc(x) ... end proc,delta0(x)=proc(x) ... end proc,u0(x)=proc(x) ... end proc]

How can I use the zero-order approximation for the future is being computed ?

I tried to do so:

F := eval(delta0(x), SYS0);
F1 := eval(u0(x), SYS0);

Fdiff := eval(diff(delta0(x), x), SYS0);
F1diff := eval(diff(u0(x), x), SYS0);

Error, (in eval/diff) non-algebraic expressions cannot be differentiated

Sysq := ((9/10)*F1(x)*F(x)*F1diff-(3/10)*Fdiff*F1(x)*F1(x)+(3/2)*F1(x))*F(x) = (1/5)*F(x)*delta1(x)-(3/10)*u1(x);

Sysqq := u1(x)*Fdiff+F1(x)*(diff(delta1(x), x))+delta1(x)*F1diff+F(x)*(diff(u1(x), x)) = 0;

SystemSec := Sysq, Sysqq;

SYS22 := dsolve({SystemSec, delta1(0) = 10^(-8), u1(0) = 10^(-8)}, {delta1(x), u1(x)}, type = numeric);

but I can not differentiate u0 (x), delta0 (x) to find u1 (x), delta1 (x) in my system

123.mw

Sorry for my english

Thank

I want to generate all 4x4 matrices of rank-1 over the field with two elements, F_2. I don't want to use actual arrays though, I just want to use symbols representing the unit matrices. So for example Eij represents the 4x4 matrix with a 1 in row i & column j, and 0's elsewhere. 

We have 16 unit matrices: E11, E12, ..., E14, ... E41, E42, E43, E44. Then we have to look at all possible linear combinations that result in a rank-1 matrix. So for example: E11+E12,  E11+E21,  E11+E12+E13,  E33+E43, etc. The total number of rank-1 4x4 matrices over F_2 is 225. How can I find all of these quickly?

Hi number of officials,

As I enter the command defined 'int' I get an error message.

What can I do. Can you help me.

Commands Entered:

int(x^2+3*x, x);

ansvers:

Error, (in int) wrong number (or type) of arguments: invalid option value passed to indefinite integration: {}

I'm wondering why the fit routine gives weird results, when telling him to fit

with(Statistics):

X:=Vector[column](3, {1 = 616.3096, 2 = 616.3248, 3 = 616.3342}, datatype = sfloat, storage = rectangular, order = Fortran_order, shape = []);

Y:=Vector[column](3, {1 = 99590., 2 = 127564., 3 = 144223.}, datatype = sfloat, storage = rectangular, order = Fortran_order, shape = []);

g:=Fit(a+b*x+c*x^2,X,Y,x)

It's telling me: Warning, model is not of full rank

If I calculate the coefficients the direct way (well the fit should be exact,because we only have 3 values and 3 parameters) I get:

M:=Matrix(3, 3, {(1, 1) = 1, (1, 2) = 616.3096, (1, 3) = 379837.52305216, (2, 1) = 1, (2, 2) = 616.3248, (2, 3) = 379856.25909504, (3, 1) = 1, (3, 2) = 616.3342, (3, 3) = 379867.84608964}, datatype = anything, storage = rectangular, order = Fortran_order, shape = []);
V:=Vector[column](3, {1 = 99590, 2 = 127564, 3 = 144223}, datatype = anything, storage = rectangular, order = Fortran_order, shape = []);
with(LinearAlgebra):
C:=MatrixVectorMultiply(M^-1,V)

Hi there

I'm trying to isolate (y1-3)²+(x1-1)² in the equation 25(y1-3)²+200+100(x1-1)²=0.

I have tried isolate and solve, but solve coplains about solving for expressions (but when inputting i:=(x1,y1)->(y1-3)²+(x1-1)² it still doesn't work), and isolate can only isolate either (y1-3)² or (x1-1)² . Not both.

How can I do this with as few lines as possible?

Thanks

- Alex

Use the Maple command DEplot to draw a direction field for the equation

make sure it at least covers the area −1 ≤ x ≤ 1,
−1 ≤ y ≤ 1

the equation is dy/dx+4y^3 −3y = 0.

then I have :

y(x):=dy/(dx)+4*y^(3)-3*y=0

with(DEtools); DEplot(y(x), x = -1 .. .1, y = -1 .. .1);

Error, (in DEtools/DEplot) vars must be declared as a list, e.g. [x(t),y(t),...]

so how can I change the command to make it work..

Its a well known fact that the spherical harmonics are eigenfunctions of the Laplace operator on the unit sphere with eigenvalues -l(l+1). Its used all over the place in QM for example. However maple does not seem to have this. 

Try it, you might be surprised. Its going to be a mess. How do you deal with it, to simplify it to the known form -l(l+1)r^-2Y_lm??

1.   can not  define  equation  when not known  E

Hello friends,

I want to derive the function of a curve. It's easy in for example "xyExtract" but I don't know how to do it in maple. please help. thank you all.

Hi

I need sort data of an imported matrix to ordered pairs.

'M' is a matrix with 2 columns and unknown numbers of row.

with(LinearAlgebra):

M := RandomMatrix(12, 2);

pairs := [M[1], M[2], ... , M[numelems(DeleteColumn(M, [1]))]];

with(CurveFitting):

PolynomialInterpolation(pairs, x);