Dear all,

       I am a newer for Maple. When I want to type some command in maple, I find that the default font is not very good. I try to change it, but when I type next exe group, I find  that the default font is recovered~~ How to change it forever?

Best regards,

 

 

I am having trouble with the following sum not adding properly:

sum(sum(sum(1/k!/j!/m!,k=2-m-j..2-m-j),j=0..2-m),m=0..2);

By my hand calculations, this should be 4 (?), but maple says it is zero. If we remove a factorial (like below) we will get a non zero sum. What am I doing wrong,or is this a bug in maple?

sum(sum(sum(1/k!/j!,k=2-m-j..2-m-j),j=0..2-m),m=0..2);

thanks.

I'm having trouble figuring out how to find the 2-D scalar potential of a 3-D vector field projected onto a plane.  The vector field is computed on the plane, coordinates (X,Y), as a vector function with arguments (X,Y,u), with 'u' being a parameter.

After invoking the VectorCalculus package and specifying

    SetCoordinates(cartesian[X,Y]),

I use the solve command to solve a quadratic equation. I get two outputs and want to assign the second output to the variable x. How can I do this?

Quadratic equation is 3x^2 - 9x+11

 

Thanks in advance!!

I have calculated data in form of a matrix. The corresponding x- and y-values are given in two lists (see attached file).

Now I would like to export the data to a textfile to use it in another program. The problem is, that I need the following format (name_listA[i]_listB[j]= is a text string where the corresponding x- and y-values are integrated)(values[i,j] is the number out of the matrix):

name_listA[1]_listB[1]= values [1,1]

name_listA[1]_listB[2]= values [1,2]

etc....

hi guys, i have the following set of equations e1='a2+a3+a5+a6-1=0'; e2='2*a1+2*a4+4*a5-1.6-2*0.2=0'; e3='a2+2*a3+a4-0.77-0.2=0'; e4='(K1*((a1+a2+a3+a4+a5+a6)^2/4)*(a5*f))-(a1^3*a2)=0'; e5='K2*a2*a4-(a1*a3)=0'; e6='K3*a4*a6-(a1*a2)=0'; symbolic a1,a2,a3,a4,a5,a6 I can slove these set of equations for known values of K1,K2,K3 but i have a set of values for K1,k2,K3 (35 values) ie K1=[1 2 3 4.......35] K2=[1 2 3........35] K3=[1 2 3 .....35]

I have the next problem, i need to  use recursion to make the equation E(x+1)=E(x)+(E(x)*(P-E(x)))/P*10 with P 15000 and E(1)=1, i put for example E(20), but maple only use ram, but doesn't do anything.

 

Thanks

I got a set of 8 variables and 8 equations, i need to solve them. I tried using "fsolve" but there are too many variables and too many equations. I thought I can try it using linearalgebra.
 

Dear all,

I am using version 12. I would like to sort a list of lists of  integers in respect to some of the terms of the sublists.

For example, the list

[  [3,5], [2,10], [9,1], [4,2], [7,3]  ]

would be sorted as:

[  [9,1], [4,2], [7,3], [3,5], [2,10]  ]

in respect to the second variable.

Actually, I found that the sort command with  the 'lexorder'[n] option would exactly this, except that it

seems that it doesn't work with numbers, but only with letters.

Any ideas?

 

Suppose I have an ODE:

diff(f(x,y),x$2) + diff(f(x,y),x) + diff(f(x,y),y);

now I want to re-scale the equation so z and x are given in terms of normalised lengths (zeta,xi)

xi=x/x0;

zeta=z/z0;

where x0 and z0 are constants.  On paper this would be written as a chain rule i.e.

df/dx = df/d(xi) . d(xi)/dx

I can't figure out how to get maple to do this for me using any for me.

 

Cheers

How can we obtain with Maple the list of the variables of an equation? For example r^2-3*s^2+2*t^2 = 0 and y = (sqrt (u^2-5)-7) / surd (u^3-6*u2,3) have respectively for variables [r,s,t] and [u,y].

Thank you

So, i've got an expression like this:

f = -1/n/n1*sqrt(-n1*n*K^2+K^2*n1^2+n1*n^2*L-L*n*n1^2) + z

(that's what the maple output is. it might make more sense to rearrange it as  -sqrt(-n1*n*K^2+K^2*n1^2+n1*n^2*L-L*n*n1^2) / (n*n1) + z )

Is there a way i can factor out n1 from each term within the sqrt, split the sqrt into 2 sqrt's (so, -sqrt(n1) * sqrt(blahblahbalh) / (n*n1)) + z and then put it in the final form -sqrt(blahblahblah) / (n * sqrt(n1)) + z ??

Dear all,

I am using the linux version of Maple 12. I am currently working on something that needs a lot of observation by eye, and it would be extremely helpful if I could color some of the output in a different color (red for example). To be more precise, my output is series of numbers, so I would like if some of them satisfy a certain condition, they should be colored red.

 

Is something like that possible with maple? When it comes to color, the help pages only talk about plots, which is not what I need now.

 

Thanks a lot in advance.

Have atached a question in a worksheet. Thanks for your help :-)

Yours

Gustav

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Hi !
(Scuse me for my English, I'm French...)


How can I solve a system of 3 nonlinear differential equations of the second order  with Maple ?

(Like this one : http://physique-ricochet.societeg.com/images/equationsMvt.jpg  where Z, X and teta are the variables). So the variables are dependent.

I've started trying with Maple Help to solve the system composed of the first two equations and making teta a constant, but it gives me back :