When I call up a Help page I see mostly boxes with question marks inside. If I copy the page into Word I get a badly formatted document in Canbria font. On other pages I get a font drop down box that indicates the page is in DejaVu Sans font and if I then change that to some font on my system (MAC 10.12.1) I get a perfectly readable document. Is there some preference, startup code or setting I can change to fix this annoyance?

I need hepl.  I work with the physics paсkage and I set:

with(Physics);
with(StandardModel);
Setup(mathematicalnotation = true)

Coordinates(X)

Define(p)

Setup(su2)

CompactDisplay(p(X))

U := 1+i*(1/f)*p[a](X)*Psigma[a]

H := v*U

DD[mu] := (d_[mu]+2*i*nu_5*KroneckerDelta[mu, 0])*Psigma[0]

And next:

Trace(DD[mu]*H*DD[mu]*H) or simplify(DD[mu]*H*DD[mu]*H)

Maple speaks:

Error, (in Physics:-Trace) invalid input: `union` received Physics:-d_[mu] = F1, which is not valid for its 1st argument

What I am doing wrong? (f, v, nu_5 is constans; a=1,2,3 and mu=0,1,2,3, Psigma[0] is unit matrix 2x2)

And if I write:

simplify(Trace(Psigma[a]*Psigma[a]))

Maple doesn't understand that it equals six. 

i am trying to solve an initial value problem i have applied a numeric code but the progam give me an error but instead of several efforts i couldn't correc the error..rho(r).mw

work_sheet.mwwork_sheet.mw work_sheet.mw
 

Download work_sheet.mw

Hi. please help to solve this attached work sheet.

EDIT: My question has been  answered below

Hello,

Lets' say I have the equation L:

L= 

I want to take the partial derivative of L to diff(theta2(t), t). 

Maple doesn't allow me to do this: diff(L, diff(theta2(t),t));

How can I solve this problem?

I hope someone can help me. Thanks in advance!

Loïc

I've read the spec online for LinearSolve but it's not clear on the function of inplace on nonsquare matrices. For example, consider the following:

A:=<0;1>;
B:=<0:2>;
LinearSolve(A,B,inplace=true)

This last line outputs <2;0>, which is also the value stored in B after the operation, whereas [2] would be the desired result. In the case of A being a row vector an error is encountered due to lack of storage. Does what happened above generalise for any matrix with more rows than columns: storing the result in B, but adding zeroes to the bottom unused parts of B, due to B being larger than the solution?

Also, does anyone have any advice on an efficient method for solving A.x=b, in the case where b is a vector, and A is a large but tall (varying size, but often 5x as many rows as columns, e.g. 10000x2000) integer matrix, where most of the entries in any particular column are zero (more than 90%)? I've found the option method='modular' helps quite a lot, but not enough, any ideas for quick fixes?

ifactor(8650368) produces

                                                        2503  *  2^7 * 3^3

how can I produce the output with factors in order from small to large and printed f rom left

2^7 * 3^3 * 2503

Hi.

This might not be a maple question. But I know maple has very smart and many plotting tools as well as this comunity is full of very skillfull people. So I concluded that I might get an answer here.

Lets say I got some sphere that is cut off by any abirutary plane, how would I go about plotting this?

For the purpose of this example the sphere is centred at the origin with radius of 4 and are cut of by the plane z=2-y.

I am trying to graph an olique cone with a circular base, and I am having trouble learning how to generate an equation for it. Any help is greatly appreciated!

when i try to get a numerical solution(using fdiff) for a second order derivative from a numerical diff ecuation procedure i got "index out of range". however, it perfectly works with a first order derivative. what's thwe matter there?

thankyou very much..
 

Download numeric_diff.mw

Sometimes I got an error (purple in output). How can I catch on programming level?

I mean I want to do smth like: if <error> -> then <action>

If you have a list that is too large the list will go off the screen without a way of scrolling.

Is there a way around that?

Here's some test code

with(Maplets):
with(Elements):
maplet := Maplet([["Pick a color:  ", ListBox['LB1'](sort(["blue", "red", "wheat", "yellow", "brown", "gold", "plum", "orange", "pink", "khaki", "magenta", "maroon", "white", "green", "aquamarine", "black", "gray", "navy", "coral", "cyan", "sienna", "tan", "turquoise", "violet", seq(i, i = "a" .. "z")], lexorder))], [Button("OK", Shutdown(['LB1'])), Button("Cancel", Shutdown())]]):
result := Maplets[Display](maplet);

Hello

My question regarding a lookup function is enclosed in the file.

lookup.mw

The Maplets, Elements, ListBox (ListBox) example given on the help page doesn't work.  I use the button to transfer the page to a worksheet window but then when I execute them I get an error.  Below is the example given on the help page.  And following that is the errors given after execution.