I have been grappling with the Maple concept of last name evaluation and would appreciate a more detailed explanation than is available in the Programming Guide (too brief) or the help page (confusing).

What I think I understand is this: Normally, Maple evaluates an expression fully until all assignments are resolved, leaving me with an expression having only "values" (in a generalized sense, could be strings, numbers, what have you) and "names", which are variables...

I am new to maple. The problem I am facing is to get a non-trivial

solution of a system of odes. But maple gve me only trivial solution.

# The system of odequations I am trying to solve is (Please note that in the bcs phi is alpha.)

# The solution of the above sys of odes is of the form, (note x3=z, its just a typo)

I made a model with mapleSim, run simulation and the following figure was got

Here I have a question. I want to know the max value of this curve that will be used in other component as input in mapleSim. Is here a component in mapleSim or other mothed such as maple?

please help me. think you

Does anyone know why the two integrations of a heaviside function (u1test and u2test) are not equal?  @Preben Alsholm said that the pure symbolic integration u was not correct so that the value of u2test is not correct either. Did I make any mistake in finding u? Is it possible for maple to find the pure symbolic expression of u correctly? Please help!

Hi, I'm having troubles with the conditions in an if statement.  My program is basically a for loop which assigns random values to some parameters, then some numbers are calculated, and finally there is an 'if' that checks if these numbers are positive.  However, when checking some of the output parameters I find that for some of them the conditions are not satisfied, i.e. the 'if' is not doing its job.  Here's a simplified version of the code.  Thanks for any help.

Hi/

the code below wroten by Maple 13. I use h=0.29669 and N:=15 and digit=80 fsolve works perfect! but when I changed N:=16 and another number greater than 15 fsolve didnt return result and return some equation.

whould you help me how to resolve this problem?

sorry i upload this code. to run easilySinc_MBVP_V2-temp.mw

thanks

> restart;
> N := 15;

Hi guys,

I have an expression, say like this:

and i want to simplify the expression like this:

Hi,

I am a beginner and am trying to solve the following PDE but get an error. 

PDE:=-diff(f(x1,x2),x1,x1)-diff(f(x1,x2),x2,x2) = a^2*f(x1,x2);

IBC := {D[1](f)(0,x2) = 0, D[1](f)(L1,0) = 0, D[1](f)(x1,0) = 0, D[1](f)(x1,L2) = 0};

ans := pdsolve(IBC,PDE);

"Error, (in pdsolve/BC) unable to handle derivatives in BCs involving arbitrary

 functions _Fn(...)"

Please guide me.

consider:

assume(k[f1]>0,k[f2]>0,k[f2]>k[f1],h_bar>0,m>0);

h_bar:=1.0545e-34;m:=0.10938e-31;n[0]=1e28;


> eq1:=n=(k[f1]^3+k[f2]^3)/6/Pi^2;

> eq2:=e*V=h_bar^2/2/m*(k[f2]^2-k[f1]^2);

> solve({eq1,eq2},{k[f1],k[f2]});

in the final command i get a very messy numerical&symbolic results like

{k[f1] = 1016612041.*
(-1.*RootOf(9456017282782496601177464289*n^2*Pi^4...

Hi,

I'm using Maple to carry out some calculations in Tropical algebra, which requires taking minima of real numbers and infinity.

I'm currently using symbols rather than real numbers, which is causing a problem, I have (for example) the following lines of Maple code:

> assume(0 < a)
> min(a+infinity, 2*a+infinity)
               min(a~ + infinity, 2a~ + infinity)

I have problem by serie solution Of maple I wanna to solve tehe following equation and the error happens I want to know whats this???

> sys := [s0*(diff(w1(x), [`$`(x, 4)]))+s1*(diff(w1(x), [`$`(x, 2)]))+s2*w1(x)+s3*(diff(f1(x), [`$`(x, 4)]))+s4*(diff(f1(x), [`$`(x, 2)]))+s5*f1(x)+s6*(diff(f1(x), [`$`(x, 1)]))*(diff(w1(x), [`$`(x, 1)])) = 0, t0*(diff(f1(x), [`$`(x, 4)]))+t1*Nx+t2*f1(x)+t3*(diff(w1(x), [`$`(x, 4)]))+t4*(diff(w1(x), [`$`(x, 2)]))+t5*w1(x)+t6*(diff(f1(x), [`$`(x, 1)]))^2 = 0];

Dear everyone,

  I have a general question. In windows (XP/7), when the maple code becomes long (1000+ lines), when i type some character, it takes some time to see that character appearing in the screen. i.e. certain lag. In linux, there is no such problem.

  I tried two computers and a few versions of maple, always the same experience. Is anyone here have the similar issue and/or how to solve this lag problem?

Maple defines the spherical coordinates angle phi from the Z-axis to R, and the angle theta from the X-axis to R.  Many texts and literature define the angle phi the opposite way from the X-axis to R and the angle theta from the Z-axis to R.  Therefore, when I input a problem from a text, which defines phi and theta by the second definition given above, I have to remember to swap the values of phi and theta in order to get the correct answer. 

Is there...

Hi, I am solving an integration. When I use "subs" command to define the value of cl and ct, the result is inconsistant with the one when I define the cl and ct directly by using "cl:= and ct:=". (Why u1test is not equal to u2test in "Comparison #1"?) Please help

result.mw

I am solving a system of equation, and whenever I used the "solve" command, its showing "Warning, solutions may have been lost", The system of equation is like that, Pls help as soon as possible.

e1 := (1/2)*alpha[2]^2+6*delta*alpha[2];

e2 := alpha[2]*alpha[1]+delta*(10*alpha[2]*lambda-20*alpha[2]*d+2*alpha[1]);

e3 := -V*alpha[2]+(1/2)*alpha[1]^2+alpha[2]*alpha[0]+delta*{8*alpha[2]*(d^2-lambda*d+mu)+3*alpha[1]*(lambda-2*d)+(4*alpha[2]*lambda-8*alpha[2]*d)*(lambda-2*d)};