## A few questions about DataSummary...

Hi everybody,

I have two questions about DataSummarize when used with "summarize=embed"

1. Is it possible to set the width of the table DataSummarize returns ?
(I thought DataSummarize used DocumentTools[Tabulate] but the option "width=..." doesn't work)
2. Is it possible to save this table programmatically (for instance in a jpeg file) ?

## Maple and Excel ...

Hello everybody,

I used Maple to reach a function in terms of a few parameters. The issue that I'm facing is that when I copy and paste that equation to excel(after transforming that same equation to 1D math) for evaluating it's value with the real values for the parameters, the result is not the same as the one calculated by Maple 2016 with the exact same parameters. I've inserted the file with this question for further information. One of the parameters (F15) is the cell used in excel.

equation.mw

Any help regarding this problem is very much appreciated.

## How do I get an exact number out of this function?...

Wus poppin Jimbos

My function is as follows:

f(x)=(10000/1+30762*0.478^x)+5

I can then type

maximize(f'(x))

And I get the result which is approximately 1845.361367

I then assign at a name e.g. "M"

I then try and execute the command (where I isolate the expression for x)

f'(x)=M

I get the result

x = 14.00001597 - 0.00005369289477 I

Which is super annoying to look at..

Is there any way that I can remove the - 0.00005369289477 I part? And just get the answer (which should be 14)

I have no problem executing

diff(f(x), x) = 1845.361366;
=
"(->)"

x = 13.99997555

However 1845.361367 once again gives me x = 14.00001597 - 0.00005369289477 I

Any help is appreciated <3

## How to modify the appearance of Biplot in PC analy...

Hi,

I use Statistics[Biplot] and the rendering is very bad with those huge arrows.

For the moment I fix this by modifying the definitions of the curves which draw each arrow (after using getdata to recover the Biplot structure)

Does it exist a simpler way to manage the appearance of the arrows ?
(options cb, cw and ch of plottols[arrow] are incorrect in Statistics[Biplot](..., arrow=[...]).

## DeterminingPDE Textbook Example...

I am trying to repeat the 'first example' in Stephani & MacCullum, Differential equations see chapter 16 and (16.5).  The differential equation is,

pde := b1(x, y)*(diff(u(x, y), x))+b2(x, y)*(diff(u(x, y), y)) = 0

and I would like to compute DeterminingPDE.  The textbook answer is linear in b1 and b2 (as my 'by hand calculation' is) but Maple's,

DeterminingPDE(pde)

contains quadratic terms such as b1^2, b1*b2 etc.  I don't understand the appearance of the quadratic terms.  Is it possible for Maple to return an answer which is linear in b1 and b2?

## Copy from Maple 2016 to Ms Word...

Good day everyone,

I am having challenges copying equations from Maple 2016 to word. Anyone with useful information should share please.

Thank you in anticipation for your kind gesture

## inequality plot problem...

Good day,

I have a problem with inequalities plotting (trsh_con.mw). I need to plot them(eq5,eq7) in the same box. But I get the wrong solution. The plot not giving me correct region for 2 inequalities. I attach the mw file. Are there any options to overcome such problems?

## Triangle Orthocenter division by zero error ...

I am trying to find the orthocenter in the x,y plane, given three coordinates  (x1,y1) (x2,y2) (x3,y3).

I am trying to avoid division by zero.

 > restart: orthocenter:=proc(x1,y1,x2,y2,x3,y3) local m1,m2,m3,L1,L2,L3,slope; slope:=(a,b,c,d)->(d-b)/(c-a); if x1=x2 then L1:=x=x1; elif y1=y2 then L1:=y=y1; else m1:=-1/slope(x2,y2,x3,y3); L1:=y-y1=m1*(x-x1); end if; if x2=x3 then L2:=x=x2; elif y2=y3 then L2:=y=y2; else m2:=-1/slope(x1,y1,x3,y3);L2:=y-y2=m2*(x-x2); end if; if x1=x3 then L3:=x=x1; elif y1=y3 then L3:=y=y1; else m3:=-1/slope(x1,y1,x2,y2);L3:= y-y3= m3*(x-x3); end if; print(solve({L1,L2,L3},{x,y})); end proc:
 > orthocenter(1,1,3,4,5,3);
 (1)
 > orthocenter(0,0,0,3,4,1)
 >

## Is there a way to import worksheets from this webs...

The following website contains worksheets written in an early version of Maple.

http://www.yorku.ca/marko/ComPhys/

I would like to import worksheets 5.1 and 5.2 and work with them in Maple 2016. Is this possible?

Clicking on the worksheet id, e.g. 5.1, displays an .mws worksheet written in HTML which is not supported as an import format.

## Which Maple features best implement this notation?...

I am beginning to study Special Relativity and Classical Field Theory - The Theoretical Minimum by Leonard Susskind and Art Friedman.

The book's notation for a 4-Vector is X superscript mu. Its components are X superscripts 0, 1, 2 and 3 which, in sequence, refer to t(ime), x, y and z.

Proper time, tau, is defined using these vector components in that sequence.

The book's notation for 4-Velocity is U superscript mu with components U superscripts 0 thru 3. U superscript zero is defined to be the derivative of X superscript zero with respect to tau i.e. dt/dtau and the remaining U components follow this pattern.

As a beginner in this area, which Maple packages/commands would most easily and clearly implement this notation in a Maple worksheet?

## Why does solve not find the relative length in thi...

Why does solve not find the value of xp = sqrt(1-v^2) in this worksheet?

SpecialRelativity.mw

Reference: Special Relativity and Classical Field Theory. Authors: Leonard Susskind and Art Friedman

## How to smooth piecewise graph edges?...

I have been working some plots using piecewise, and this seem to always result in graphs with very jagged edges

Example: https://i.imgur.com/ZBOSDsL.png

The function its plotting is this one:

```f:=unapply(piecewise(x^2+y^2 <= 1 and x>=0, 4*x*y^2-x^2, undefined),x,y):
```

Now I assume this happens because of the piecewise part. How do I smoothen the edges?

## How do access results from "solve"...

How do I access and assign values given by the solve command

for example

```f := unapply(x*(8*x^2+5*x+cos(y)), x, y);

p := solve({diff(f(x, y), x) = 0, diff(f(x, y), y) = 0}, {x, y})```

This gives the following

`{x = 0, y = (1/2)*Pi}, {x = -1/6, y = 0}, {x = -1/4, y = 0}, {x = -1/2, y = Pi}, {x = 1/12, y = Pi}`

now if I type: p[1] I get the following

`{x = 0, y = (1/2)*Pi}`

Now this isn't very useful. I want to access the "0" and the "(1/2)*Pi". How do I do that?

## How to deallocate memory ?...

Hi,

As a notional example those instructions generate 21 variables and around 4 Giga Bytes of data (bottom right of the Maple window ; roughly the same value read from the windows manager)

with(Statistics):
for n from 1 to 10 do
X__||n := RandomVariable(Uniform(0,1)):
S__||n := Sample(X__||n, 10^8)
end do:

I want to clean some part of the  memory ; for instance all the S__||n.
The following doesn't work

KeepVars := { seq(X__||n, n=1..10)}:
unassign({anames(user)} minus KeepVars ) ;
gc();

Is there a way to deallocate the memory occupied by some of my user variables ?

## Use diff overdot without in vector...

Hi, I'm trying to display (print / typeset) a vector of derivatives where an overdot is used instead of d/dt and the dependent variable is hidden.  For a single variable

Suppress(x(t)):
diff(x(t),t);

Gives the desired result, but

Suppress(x(t)):
Suppress(y(t)):

<diff(x(t),t),diff(y(t),t)>;

doesn't.  I presume the vector/matrix package is doing something to the formatting?  Any help would be appreciated. Thanks.

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