In a Button, this command enables us to display in a Mathcontainer a   (Delta). 

D(%Mathcontainer0 = 'Delta');

However, I want to display  y. (Delta y). If I write

D(%Mathcontainer0 = 'Delta y');

As a user of Maple 13, namely in computations on General Relativity & Tensor Calculus, I would like to let you know I just got, using Maple 13, the WRONG SIGN (positive Riemann scalar curvature in stead of correct NEGATIVE Riemann scalar curvature) in studying a threefold used as a 'Public Space' by Milne many years ago.

The square of the distance on the said threefold is dE^2=dR^2+(c*t0)^2*sinh(R/(c*t0))^2*(dtheta^2+sin(theta)^2*dphi^2) and you might be interested...

My question is similar to the one referenced, but a bit more complicated.

Considering a PDE of order n, I would like it to be collected by the order of differentiation.

A simple example:

simplify(( (3+4*x)*diff(f(x), `$`(x, 2)))+(5+4*y+z)*(diff(f(x), x))+(1+r+y)*f(x))

where the idea is to return to the form prior to simplification, including the sort by differentiation order.

After it is simplified, I can get the coeff of only the highest order derivative, as

What's wrong?
I need to minimize (z-Z) ^T.E^-1. (z-Z).
How can you see in the first Call to LSSolve worked. By introducing objectivejacobian I have problems

Assuming I have a general function f(x). The derivative with respect to x would be: df/dx .

I now want to rescale, which basically means that I want to change x to a*y where a is a parameter (general constant) and y is my new variable.

If I use

subs( x=a*y, df(x)/dx )

I get

d/d(a*y)  f(a*y)

but 'a' should be a parameter, so this should give

1/a * df(a*y)/dy = df(y)/dy

How do I tell that to Maple?

Assuming I have an expression, 'F', I would like to extract from it a factor, 'a', so the expression is displayed as

a*(F/a)

where F/a is a simplified (or expanded or any other displayed form) expression.

As an example:

F:=1 + Q*x² + P*x³

a:=x² / L²

then this will be displayed

x² / L² * ( L² / x² + Q*L² + P*L²*x)

Hi all,

I've just added a reply to an old thread I opened some month ago, but I don't see the thread at the top of the recent questions. Where is it gone????

Should I re-open a thread?

Thanks

ps the thread was this one: http://www.mapleprimes.com/questions/35837-Execution-Stopped-Unhandled-Signal-Caught-UNKNOWN-1#comment96090

Hi all,

is there some way to handle piecewise functions as if they were just another equation? In this case I´ve got a piecewise in 4 segments, one of them empty. The other segments are equations that solve a function for a variable under constraints, i.e. it shows somewhat like:

{(conditions1), q[O]=(...), (conditions2), q[O]=(...), (conditions3), q[O]=(...), else, []}

(I hope you get what I mean. The piecewise is a tad long and I wouldn´t...

Dear All,

I would like to ask either MAPLE is capable to solve >2 boundaries value problem.

Actually I'm solving a system of ODEs in a membrane divided electrochemical cell, basically a REDOX process.In 1 part I have 2 species reacting and in another part I have 3 species reacting , 2 of the species exist in both part.

At the end I wanted to coupled all the species together.

So basically I have 4 boundaries and I would like to solve it simultaneosly.

Hello! Im kinda new to maple so it must be a noob question :) im using it for like 24 hours to get around some basing math in it :)

Just got some understanding of this 2d/1d/worksheet/document modes and stucked at some operations with fractions.

1) How do i enter Mixed fractions to calculate right?

2) How to compare Two or More fractions? 

3) How to get output in mixed fractions? or to expand fractions.

Hi all,

I needed to create assumed variables for a problem I´m working on. After working on them in a last step I need to replace the assumptions with values so as to get a real number. - I don´t want to define values to the variables from the beginning as I want to avoid rounding errors and I don´t know any other way around the problem.

Giving you the exact problem would be bit too complicated, but you might get to know what I would like to do with this example:...

Hi

My Maple 13 puts small curly brackets to the left side of an expression and this causes several problem for me. What should I change to write good ones? (I mean normal, big brackets, not small brackets to index.) (I use the AltGr+b combination to write a left curly bracket.)

I have this equation:

When I atempt to solve for this is the answer I get:

Using the Physics package I am trying to define commutation rules between operators. However it looks like when the commutator involves a Dagger, it is not "remembered" properly. Here is a (contrived) example (you might have to run it on your machine in case not clear from copy/paste what's going on):


restart:
with(Physics):

Setup(quantumoperators={a, b, c});
                ...

hi

I have got an eq: Curl(A)=B;

Both A and B are vectors,  for example,             

A(x,y,z):=Ax(x,y,z) _i+Ay(x,y,z) _j+Az(x,y,z) _k;
B(x,y,z):=Bx(x,y,z) _i+By(x,y,z) _j+Bz(x,y,z) _k;

can I get A as a funtion of B? if I can, how to deal with it, and if not, what other known conditions should be added to solve it?

any help would be appreciated@。@