Hi everybody:

I'm going to learn programming with maple 18, are there any good and new pdf files for learn it?

with regards...

Consider the following situation: I have a function f, say

f:=x -> 1+x^2/n;

I want to compute the composition of f with itself; e.g.

g:=f@@n;
eval(g(x),n=3);

So it appears eval does evaluate the threefold composition but not at n=3. Obviously I can wrap this example in a subs() or another eval to get the replacement done; but it is a bit curious and I wonder whether this behaviour is as designed or an "undocumented feature."

I ran across this when investigating whether or how to do the composition for an arbitrary n (so I can e.g. find the limit for n=infinity) and really wanted to ask about that, but I see that such a question was dealt with before by Joe Riel using rsolve so I'll see first how far that approach gets me. In my case the function will be a polynomial vector function with vectorial arguments, providing for some additional challenge.

Mac Dude.

for example

There is a Matrix A:=Matrix([[1,2,3],[4,5,6]]), which function can help me find if 4 is an entry of  this Matrix?

Hello,

From a simulation software, I obtain in a matlab file my differential equations in the following way :

C_p_e = C_state/C_c;
C_p_f = I_state/I_i;
R_p_e = R_r*C_p_f;
I_p_e = (Se_p_e-R_p_e)-C_p_e;

For theses expressions, I would like to do two operations :
1) Transform it into equations
2) Conduct substitutions so as to change the names of the variables with nicer names.

For this objectives, I could do with the following code:

restart;
eq1:=C_p_e = C_state/C_c;
eq2:=C_p_f = I_state/I_i;
eq3:=R_p_e = R_r*C_p_f;
eq4:=I_p_e = (Se_p_e-R_p_e)-C_p_e
allsubs:= proc(XX )
subs(C_p_e=fs(t),C_p_f=v(t),R_p_e=fd(t),I_p_e=fm(t),C_c=1/k,I_i=m,R_r=c,Se_p_e=fe(t),I_state=int(fm(t),t),C_state=int(v(t),t),XX)
end proc:
eq1_a:=allsubs(eq1);
eq2_a:=allsubs(eq2);
eq3_a:=allsubs(eq3);
eq4_a:=allsubs(eq4);

Now, I would like to automatisation the creation of the equations eq1, eq2, eq3, eq4. For the moment, to create these equations, I have done copy/ paste from matlab.

But, I would like to create these equations eq1, eq2, eq3, eq4 with a automative process from my matlab equations. The reason comes from the fact that I would like to make the same work on bigger system which are composed with numerous equations.

How can I create equations labeled eq1, ...eqn from a list of expressions from matlab ?

Thank you for your help

Hello everybody,

I'm trying to solve two ODEs analytically but it returns this 'Warning, it is required that the numerator of the given ODE depends on the highest derivative. Returning NULL'. See the worksheet Parallel_flow.mw

Thanks.

I am not sure how/why, but here is the worksheet.

test.mw

The function evalutes fine and can be used for sequence. But it does not seem to be working with plot or Maximize.

V is assumed to between 0 and 1.

Need some help.

Thanks,

casper

Dear all,

I have to differential equations that I'd like to linearise, that is all higher order (>1) derivatives (like diff(uu[0],x$2)) and parameters (like beta^2) and the products of any derivatives with the parameters uu[0] and beta are zero (as they are assumed small).

The two equations considered are displayed below:

Up to now, I perform a very tedious substitution which is based on looking at the equations above and decide which terms I want to get rid of. Something like this, where K =1:KFBCLin:=simplify(eval(KFBC, [beta^3 = 0, beta^2 = 0,
seq(subs((diff(uu[n], x$3)) = 0),n=0..K),
seq(subs((diff(uu[n], x$2)) = 0),n=0..K),
seq(subs((diff(uu[n], t))*beta = 0),n=0..K),
seq(subs((diff(uu[n], x))^2 = 0),n=0..K),
seq(subs(g*diff(beta, x)*beta = 0),n=0..K),
seq(subs((d^2*diff(uu[n], x,t)*diff(beta,x)=0)),n=0..K),
seq(subs(-2*d*diff(uu[n], x,t)*beta*diff(beta,x)=0),n=0..K),
seq(subs((d^2*diff(uu[n], x$2,t)*beta=0)),n=0..K),
seq(subs((diff(uu[n], x)*uu[n])=0),n=0..K),
seq(subs((diff(uu[n], x)*uu[n]*beta)=0),n=0..K),
seq(subs((diff(uu[n], x)*uu[n]*d)=0),n=0..K),
seq(subs((diff(beta, x)*uu[n])=0),n=0..K),
seq(subs((diff(uu[n], x)*beta)=0),n=0..K)]));As there is a lack of automatisation, this procedure is not very helpful. Life would be easier if there was a command (or the like) that says "get rid of higher order derivatives".Any help is appreciated.Best regards,

I have purchased Maple 2015 Student Edition a few months ago.  Now, I was about to buy MapleSim Student Edition and I saw that MapleSim include a license of Maple. 

If I buy MapleSim and Maple,  I would pay 198$ even if I could have bought only MapleSim and still get both products? 

Can I get MapleSim Student without Maple at a lower price? 

Maybe the version of Maple included in MapleSim has less features and that's why the cost of MapleSim and Maple are the same? 

Thanks in advance!  

I did some search on Google and on this website, but I haven't found anything. 

Hello everyone!!

I am beggining to use Maple and i saw there are many Math Apps in the Library. I was wondering if I can see the source code of some of this Math Apps to learn how to do my own ones.

please demonstrate to me how to set up a maple document to solve a simple beam design from the scratch.

S. Hassan

I'm using commands evalDG and LieBrackets to calculate Lie Brackets of infinitisemal operators.

But how (using Maple) can i extract component from the result?

For example, I had a result:

T = (f'(x) - f(x)) D_x + D_y

I need to get its component for x - f'(x) - f(x) and y - 1.

Is there a command for this operation?

Given this

z := -d*(y+a)+a;

and say we want to replace  a-a*d by c  so that the result is  c - d*y, but this does not work:

algsubs((a-a*d)=c,z);

since Maple does not "see" the d*a expression as it is not expanded yet.  Only when writing this it works:

algsubs((a-a*d)=c,expand(z));

At first I thought since this is an "algebraic" substitution, then Maple will figure it out on its own. But it seems that the expression being substititued has to explicity show there for it to work? Looking it help, it says

"Like subs, it does not expand products or powers before substitution"

So my question is: Is the rule of thumb when using algsubs, is to always expand the expression as in the above example?

Is there another Maple command or a package, which would have found this substition on its own? (i.e. without expanding first)

with(Groebner):
T := lexdeg([x,y,z],[e1,e2]);
intermsof1 := y;
intermsof2 := -z;
GB := Basis([e1-intermsof1, e2-intermsof2], 'tord',T);
result := NormalForm(y^2-x*z, GB,'tord', T);
result := NormalForm(y^2-x*z, GB, T);

originally Basis do not have error when without parameter 'tord'

after it has argument error, it has to be added extra parameter tord

NormalForm has the same error too.

i do not understand why it has error, how to solve?

i just want to express y^2-x*z in terms of y and -z

Where is the mapleclud palltte button ?   It is not in my Maple 16,  not in   mymaplecloud

How to upload a maple work sheet into  my maplecloud private  storage ?

In Maple 2015:

restart;
with(Tolerances):
a:= 3 &+- 1;
b:= 2 &+- 1;
c:= 2 &+- 1;
solve(a*x^2+b*x+c=0,x);

gives "Error, (in evalr) improper op or subscript selector"

Is there a way to make it work with interval, i.e. Tolerances variables?  In Mathematica, the above works:

a = Interval[{2, 4}];
b = Interval[{1, 3}];
c = Interval[{1, 3}];
Solve[a*x^2 + b*x + c == 0, x]

Screen shot:

I was hoping to get similar result with Maple.  Is there differenet package/commands to work with interval variables in Maple that would support all operations if not this package?