## Writing an explanatory paragrah I want to use an a...

Writing an explanatory paragrah i want to use an approximately equal symbol. How can I do this? The palette has lots of symbols but not what in latex would be done with \approx

## Why does solve work with a system of equations, bu...

I just tried to solve a very simple system of equations using solve but depending on how I write the system the command does out give any output.

 (1)

Solution with pencil and paper

=

=

Check this solution

 (2)

 (3)

Notice that if I define I__cm then there is no solution being shown. I can rename I__cm to something else like y, still no output. Then in the second system I simply sub I__cm into the equation that has this variable, and it works.

So what's going on here? Why doesn't the first use of solve work?

## How to read smiles file using quantum chemistry to...

How to read the topological structure of chemical from a SMILES file in Maple

As I want only the physical structure of the molecule

Like in molecular data it gives the bonds of topology {1,2} like the structure it gives

As SMILES can give 2D structure to me

Kind help how to do

## Burger's PDE Solution...

My following code:

restart;
PDE := diff(u(x, t), t) + u(x, t)*diff(u(x, t), x) - 0.1*diff(diff(u(x, t), x), x) = 0;
IC := u(x, 0) = sin(x);
BC := [u(0, t) = u(2*Pi, t)];
pds := {BC, IC, PDE};
ds := {pds, t = 0 .. 10, x = 0 .. 2*Pi};
p := pdsolve(ds, numeric);
u := rhs(p[1]);
u(x, t);

producing following 2 errors, don't know how to handle?

Error, (in anonymous procedure called from pdsolve/numeric) invalid terms in sum: 0 .. 10
Error, invalid input: rhs received p[1], which is not valid for its 1st argument, expr

## barycentre of 3 weighted points...

How to make this program more effective ?

A := [-3, 1, 2];
B := [-2, -1, 1];
C := [0, 3, -3];
A := [-3, 1, 2]

B := [-2, -1, 1]

C := [0, 3, -3]

alpha[1] := 2;#weight
alpha[2] := -1;
alpha[3] := 1;
alpha[1] := 2

alpha[2] := -1

alpha[3] := 1

x[1] := A[1];
x[2] := B[1];
x[3] := C[1];
x[1] := -3

x[2] := -2

x[3] := 0

y[1] := A[2];
y[2] := B[2];
y[3] := C[2];
y[1] := 1

y[2] := -1

y[3] := 3

z[1] := A[3];
z[2] := B[3];
z[3] := C[3];
z[1] := 2

z[2] := 1

z[3] := -3

sum(alpha[i], i = 1 .. 3);
2

xG := sum(alpha[i]*x[i], i = 1 .. 3)/sum(alpha[i], i = 1 .. 3);
xG := -2

yG := sum(alpha[i]*y[i], i = 1 .. 3)/sum(alpha[i], i = 1 .. 3);
yG := 3

zG := sum(alpha[i]*z[i], i = 1 .. 3)/sum(alpha[i], i = 1 .. 3);
zG := 0
Thank you.

## Trouble trying to follow on a least squares video...

Hello everybody!

Since least squares is not fully understood by me all that well, and the way my Dutch book throws me into the deep whitout really showing how things are done, i decided to look for some videos on Least Squares in Maple on YouTube. Well, i did found one, but then this happened. "Error, (in sum) summation variable previously assigned, second argument evaluates to 1 = 1 .. 5" I just want to go further with the video, but now im stuck and i have no clue how to go on.

https://youtu.be/8zh73UrJW6M?t=948 This is the video at the moment the part where i get stuck is shown.

I really like these sort of videos while they really do help out. I think its great.

This is my maple worksheet:

 >
 (1)
 >
 (2)
 >
 (3)
 >
 (4)
 >
 (5)
 >
 >
 >
 (6)
 >
 >
 >
 >
 >
 (7)
 >
 >
 >
 (8)
 >
 (9)
 >
 (10)
 >
 >

Thank you very much!

Greetings,

The Function

## Execute an entire worksheet in a loop?...

Is there a way to execute an entire worksheet for a list of values of a parameter.
Sometimes executing in the standard loop can be cumbersome given you have to add catch statements for errors to prevent the loop from stopping.

## How to get polynomial expression...

Hi,

I'm not able to find a way to bring an equation into it's "polynomial" form:

I'd like this expression in the form of:

c1*v^3+c2*v^2+c1*v+c0 = 0

where c1...c4 are my coefficients

How can I do that?

## How to convert the RootOf function?...

Hello guys
I'm having trouble converting the RootOf function. Attached is a simple notebook.

Sincerely,

Oliveira

Example.mw

## how do I use a symbol as a subscript, eg A_*, to l...

Dear Maple Users:

Could you help in the following question?

How do I use a symbol as a subscript, e.g.  A_*, to label an axis?

## This should work either way. Index using a hard co...

X := vector([seq(x, x = 1 .. 5)]);
Y := vector([seq(x, x = 6 .. 10)]);
X[1];
Y[1];
Yfactor := evalf(X[`1`])/Y[`1`];
evalf(Yfactor);
X := [1, 2, 3, 4, 5]

Y := [6, 7, 8, 9, 10]

1

6

X[1]
Yfactor := -------
Y[1]

X[1]
----
Y[1]

m := 1;
X := vector([seq(x, x = 1 .. 5)]);
Y := vector([seq(x, x = 6 .. 10)]);
Yfactor := X[m]/Y[m];
evalf(Yfactor);
m := 1

X := [1, 2, 3, 4, 5]

Y := [6, 7, 8, 9, 10]

1
Yfactor := ---
6

0.1666666667

## Covariant Derivative of Riemann, Ricci and Weyl te...

hi guys,

suppose we have general metric form in 4-D. I want to calculate Covariant derivative of Riemann, Ricci and Weyl tensors.

with best,

## Error (in f) when datatype float[8]...

I dont know why I could not solve this problem.

I have attached my worksheet.

Please anyone help me to get solution to this problem.

Thank you so much

fypppp.mw

## Is there a way to import functions form NIST Digit...

DLMF offers different encodings for mathematical expressions. Example:

I was wondering if TeX or pMML (never seen before)  can be imported into Maple and subsequently be used as  Maple Input.