## 4855 Reputation

10 years, 215 days

## Linux settings...

Sounds like an operating system setting.  On windows you can change the icon setting sizes.

## graphics 256 colors...

Definitely some sort of graphics issue.  Looks like it's gone to 256 colors.  See if you can manually change your graphics in windows.

On what system are you using and what operating system?  It looks like windows 7.  Maybe you used some sort of compatibility mode or something.

## nops...

nops will give a basic idea of the number of operands in an expression.

I think readdata is the most efficient way to read a file.

## grid=[m,n]...

Try grid=[100,100].

## exp(y)...

Use exp(y).

exp^(y) and e^y mean something different in Maple

## Physics package...

You could also use diff from the Pysics package

Physics[diff](L,diff(theta2(t),t))

## seq...

y:=x+k:
plot([seq(y,k=1..4)])


## try map or transform...

You could try a couple of ways

1/ Alter the data going into the plot on the fly with map

a:=[[2,4],[5,6],[2,8],[13,65]]:

with(plots):

pointplot(map(a-> [a[1], -a[2]], a))

2/ transform the plot with plottools

coordchange:=plottools:-transform((x,y)->[x,-y]):

coordchange(pointplot(a))



## palletes...

Oh, I see custom components are in the pallete off to the left side.  So then all I do is drag and drop a component in the cell and modify from there.  I was looking in the file insert and everywhere but the pallete and couldn't find anything.

## I posted to this effect already, but I g...

I posted to this effect already, but I got no responses or no one cared, I don't know.

It happened I believe Friday or Saturday during an update to mapleprimes - there was a period of time when the site was inaccessible at which time I believe an update was being applied.

Maplesoft should reply to these effects.  As a workaround I copy paste in Paint and copy from there.

## A start...

Here's a start ...

Quantum mechanics using maple  http://www.springer.com/la/book/9783642795404

Quantum mechanics using computer Algebra http://www.worldscientific.com/worldscibooks/10.1142/7751

Maple package for computation in Lie algebras http://people.math.carleton.ca/~billig/maple/

# Mathematics of CLIFFORD - A Maple package for Clifford and Grassmann algebras https://arxiv.org/abs/math-ph/0212031

## derive the formula...

Maybe me but more math than maple.

So a square surface area (a x a) of area a2 projected onto some cylindrical surface of radius R.  So the length of one line in the square, a, projected on the surface of the cylinder is s=R*theta*2*Pi/360

Using the cosine formula to find theta in terms of R and a gives

theta=cos-1(1 - a2 / (2*R2) )

and s*a will be the area on the surface of the cylinder.  So the area of a square sides a projected onto the surface of a cylinder radius R is   R * theta * 2*Pi/360  *a

## has...

another way

has(ifactor(390),7)
false

## mean and standard deviation...

As a start, you mean something like this?