i want someone to help me with this intergration w := (int(K/(y-y1), y = -s .. s))/(4*Pi) he want to know if y1 is between s and -s ,while y1 really exist between s and -s thanks

a:=["34mt5","tru532","64E22N"]

I thought this command worked on Lists.

Select(HasDigit,a)
    Error, (in StringTools:-Select) second argument must be a string

So then I thought maybe map might work

map(HasDigit,b)
     [true,true,true]

okay closer. 

Select(map(HasDigit, c), c)
     Error, (in StringTools:-Select) second argument must be a string

Can't figure out how to get around that string problem

I noticed that if I use add instead on using an integral int I dont get the same value. why ??

restart:
E := 7:   p := .5:
add(p^n*2^(n-1), n = 1 .. E)-p^E*add(2^(n-1), n = 1 .. E);
evalf(int(p^n*2^(n-1), n = 1 .. E)-p^E*(int(2^(n-1), n = 1 .. E)), 5);
 
                                  2.5078

Dear reader,

For a concept evaluation I need a system of 13 equations to be solved. Not necesserarily explicitliy, it would be sufficient for me just to see dependencies between variables. However either me or Maple or both are incapable of doing so. I am using Maple 13 by the way.

Hi, I'm having trouble getting Maple to solve the following simple inequality: H:=sqrt(1-0.3*sin(f)^2), solve(H>.9).  I get no solutions regarless of assumptions ect.  However, solve(H^2>0.9) works fine.  Anyone know whats going on?

thanks

okay, so I was asked this question

Hi,

Assume I have an eqn:=diff(x(t),t)+diff(y(t),t,t)+x(t)=0(It is just an example) for example, how can I find in which order variables are apearing here in this eqns?

for example I can give this eqn and result for x would be 1 and for y would be 2.

What is Maple command for that?

Thanks in advance,

Bye

 

 

I have two lists in Maple that I would like to join into a single list based on the values in a common field.  The best tool for such an operation is a relational database management system (RDBMS) where I would use SQL JOIN syntax.  The R program for statistics has an internal command, "merge" which can perform this operation on data frames [http://stat.ethz.ch/R-manual/R-patched/library/base/html/merge.html].  I would like an analogous operation in Maple as a convenient alternative to turning to a full RDBMS.  Does Maple offer such a command?

I have an application for wave temperature propagation in soil: with (plots); > u(x,t):=A*exp(-sqrt(w/(2*a^(2)))*x)*cos(-sqrt(w/(2*a^(2)))*x+w*t); > w:=10; > A:=4; > a:= 4*10^(-3); >plot3d(u(x, t), x = 0 .. 10, t = 0 .. 10); It is for x = 0. How can I do for x>0? Thanks, Raluca

I have an application for wave temperature propagation in soil: with (plots); > u(x,t):=A*exp(-sqrt(w/(2*a^(2)))*x)*cos(-sqrt(w/(2*a^(2)))*x+w*t); > w:=10; > A:=4; > a:= 4*10^(-3); >plot3d(u(x, t), x = 0 .. 10, t = 0 .. 10); It is for x = 0. How can I do for x>0? Thanks, Raluca

As part of a worksheet I have the following commands sys1sol := dsolve(sys1, numeric); sys1sol(2); Where the appropriate things have already been defined. As an ouput for sys1sol(2) I get [t = 2., i1(t) = 0.929532062300405666e-1, s1(t) = .907046793769959448] Is there any way I can extract the value for i1(t) and s1(t) in order to use them later on in the worksheet? Many thanks.

Hi !

Do you know how I can solve numerically a system of partial differential equation with Maple ? I've 3 variables : x,y,t and my system is :

EDP := [diff(s(x, y, t), t) = -.45*i(x, y, t)*s(x, y, t), diff(i(x, y, t), t) = .45*i(x, y, t)*s(x, y, t)-.2*i(x, y, t)-.7*(diff(i(x, y, t), x)+diff(i(x, y, t), y))]

f :=  1-g(x) ; g :=  piecewise(x = 20, .2, 0)
IBC := {s(0, y, t) = 1, s(x, y, 0) = f(x, y), i(x, y, 0) = g(x)}

 

Im using maple 13

I always encounter an error everytime i use the feature ShowSolution

the error says:

"Error, (in Student:-Calculus1:-ShowSolution) input expression does not have any incomplete calculus operations"

This always happens in all the calculations.

 

How should I use the ShowSolution properly?

 

Hello-

I've looked everywhere I can think of, but can't find the answer to this question: is it the case that the Ricci tensor in maple is defined as:

R_bca

as opposed to:

R_bac ?

These would differ by a sign.  Thanks!