Hi all,

sorry for my cryptic previous posting. Here is my question again:

I am searching for an easy way to determine the sign of a function

m(a) = 1/4*(-2*g+ln(1-l+a)*g-(g*ln(1-l+a)*(ln(1-l+a)*g-4*g+8*d*a-8*y))^(1/2))/g .

More specifically, I want to find out whether m(a) can assume a positive value given that

(1+l-a) lies between 0 and 1 and all parameters (g,d,l,y) are nonnegative (I have plotted the function; the plot exhibits that the fct does not assume a value greater than or equal to 0. However, I want to have an algebraic solution).

I have a function that PLOT (2D) refuses to write all the way out to x=0.01 .  It stops the curve at x=0.005 or so, no matter how hard I try to make it do otherwise.  When I make a POINTPLOT from a SEQ generated from the function, then I see the full curve.  Can anyone tell me what is wrong before I send this problem in to tech support?  I am sure the function is defined and continuous.  Ratch

Hi!
I am a student and have recently started using Maple.can anyone help me for the following problem please!

 well i have a system of four partial differential equations in Maple with 04 variables P(x,y) , Q(x,y) ,  R(x,y) , S(x,y).

 the 1st eqn :          P + P^3 + Q^2 - R=0

 the 2nd eqn:        Q + Q^2 + P^3 + S=0
 

 the 3rd eqn:         diff(P,y) + S = 0

this is a practice question that my professor give us. we need to write down the procedure

Given a list L of size N, split it into two equal size
lists L1 and L2 such that
– L1 = L[1..N/2]
– L2 = L[N/2+1..N]
• Use Select Sort to sort list L1
• Use Select Sort to sort list L2
• Merge the sorted L1 and L2 into a list L3 suchthat L3 is sorted.
• Print list L3

thanks

we are not allowed to use any build-in procedure such as Max

 

When I plot(cos(2*x^2)) the plot doesn't look right.  The graph area between -7 and -8 jumps and similarily on the positive x-axis.  It doesn't appear to affect values just the visualization of graphs.  If you plot(cos(2*x^2),x=-7..-8) the graph is fine. 

Hi,

can Maple evaluate repeated compositions in a symbolic way?

q:=x->x+1;
(q@@n)(x);

expected result::

x+n

 

Thanks

I want to interpolate two colors

CI := proc(r)
   local X, Y;
   X := [0, 100/255, 0];  Y := [1,1,1];   
   #return r*X+(1-r)*Y
   return [r*X[1]+(1-r)*Y[1], r*X[2]+(1-r)*Y[2], r*X[3]+(1-r)*Y[3]]
end proc: 

plot3d(0, x=0..1, y=0..1, style=surface, axes=boxed, orientation=[-90,0], color=CI(x));

works. However the first version with return r*X+(1-r)*Y fails. Why? Both give the same result for CI(0.9) and true for type(CI(0.9),list).

Thanks,

Peter

Hello,

Is there a direct way to calculate the area of the following 2D region in Maple (analytically or numerically).
The borders of the  region: y=x, y=2*x, x*y=1, x*y=2 {x>0,y>0}
Is it possible to define such region for integration (symbolic or numeric) in Maple?

Hi

Some time ago I started to write my own modules.
I've a problem with a module calling an export of another one. Both have the "package" option.

The first module, Math_Tools_ex export a "diffindice" procedure. I copy here the relevant part of the code:


####################################
Math_Tools_ex:=module()

export diffindice, doublederivcov,Dimensione,mix, Test_Symmetry, Double_dag ;
export Coords,A,M,G, Abstraction;
global X, c, dimensione,abstraction;

Hi, can some one help me solve this differential equation. diff(y(r), r, r) = -2*(diff(y(r), r))/r-1.910049266*10^5*polylog(3/2, exp(-0.4813739e-1+0.203e-2*y(r))) the boundary conditions are: y(infinity)=0, Dy(0)=0 Thank you MS

Hello,

How can I count the rows of a (m,n)-Matrix.
describe[count](M) or something else??

BR
CHR

I can insert a table from the Insert menu > Table ..., and I can modify all its properties etc. But is there any way I can "populate" a table with data? Say, for example, this table, on p.167 of my set book, http://books.google.co.uk/books?id=AKsLy0rVGuwC&pg=PA165&lpg=PA165&dq="richardson's+extrapolation+with+five+terms"+"advanced+mathematical+methods+with+maple"&source=bl&ots=ngJbnsw304&sig=D7yj31K_CMLwtvBWo62MXph0qBY&hl=en&ei=KzgWSvu9Gca5jAf2lsX_DA&sa=X&oi=book_result&ct=result&resnum=1#PPA167,M1

It appears that the eigenvalues that Maple computes here are incorrect:

Hello,

I would like to add a date to label of axes in this example. Is it possible in Maple 12?

Hello - I wonder if anyone can help.

I want to convert the square root of 2 into base 12 from decimal, to about 1000 digits. I've had a go at this with Maple using convert/base but this will only let me convert integers. Is there a way to display sqrt(2) in base 12, either by calculating sqrt(2) and then converting, or calculating and converting all in one go?

Thanks for any suggestions

Simon