Henry Baker | 19 Dec 16:12 2014
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Critical update of GitHub windows clients

"We strongly encourage all users of GitHub and GitHub Enterprise to update their Git clients as soon as
possible, and to be particularly careful when cloning or accessing Git repositories hosted on unsafe or
untrusted hosts."

https://github.com/blog/1938-git-client-vulnerability-announced

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Jaime Villate | 19 Dec 14:09 2014
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Re: legend query

On 19-12-2014 12:35, categaffney1 <at> aol.com wrote:
> I seem to have mangaged to plot the graph now, it worked without the 
> [gnuplot...] at the end, but now the legend is obstructing the graph ( 
> see attachment)
>
> When I add the [gnuplot...], the error message appears again? 
Make sure that the string that comes after gnuplot_preamble is enclosed 
within quotes and does not have line-breaks. A new line in between the 
quotes would trigger a Gnuplot error (unless you use a backslash at the 
end of the line).

Regards,
Jaime

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BooBoo | 19 Dec 12:57 2014

Problems Calculating Expected Value

Greetings,

I am trying to calculate the expected value of a random variable that 
has the pdf f(u) defined below. The expected value should be undefined, 
but it comes back as -1. I edited the output a bit to make it look 
right. Am I doing something wrong here? I am using Maxima version 5.34.1 
on Windows 7.

(%i1) f(u) := 1/(u+1)^2;
(%o1)                          f(u) := 1/(u+1)^2

(%i2) integrate(f(u),u,0,inf);
(%o2)                                  1

(%i3) integrate(u*f(u),u);
(%o3)                         log(u + 1) + 1/(u + 1)

(%i4) integrate(u*f(u),u,0,inf);
(%o4)                                 - 1

(%i5) integrate(u/(u+1)^2,u,0,inf);
(%o5)                                 - 1

Tom

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(Continue reading)

categaffney1 | 19 Dec 01:28 2014
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legend query

hello

I am currently trying to plot:

parabola:y=2*x^2-3*x-1;

circle:(x-1)^2+(y-3)^2=5;

wximplicit_plot ([parabola, circle], [x,-3,4],[y,-3,6], 
[gnuplot_preamble,"set key bottom"]);

and a big box appears where a graph should be with a big cross over it 
saying 'Error' and then the file location written underneath.

I am very confused, since when I last accessed the document, the same 
inputs created a correct graph showing both the parabola and circle.

Can you help me and suggest what I may be doing wrong?

Many Thanks

Cate

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(Continue reading)

Robert Dodier | 18 Dec 21:33 2014
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idea for sign/asksign in limit

At present limit can't figure out some limits because GETSIGNL
calls sign instead of asksign (as it did at some point in the past).
The trade-off is that calling sign quiets some asksign questions,
but then limit gives up too soon on some problems.

An obvious idea is that limit should try figure out the limit
without asksign, and then resort to asksign. This has the
advantage that it doesn't change the expected results for any
limits that can be computed now, and makes possible some
additional ones. For example, in each of these cases, the
result is a noun expression at present; with the proposed
patch, the user gets an asksign (or sequence of them).

  limit(a*x, x, inf);
  limit(z^a/a!, a, inf);
  limit(%e^(beta*hbar*omega-beta*(hbar*(2*n+1)*omega+delta))
         /(1/(1-%e^-(beta*hbar*omega))^2 +(%e^-(beta*delta)-1)/(1-%e^-(2*beta*hbar*omega))),
        beta, inf);

What does anyone think of that?

best

Robert Dodier

PS. Here is a simple-minded implementation of the idea.
diff --git a/src/limit.lisp b/src/limit.lisp
index dc3f7f6..4488bf2 100644
--- a/src/limit.lisp
+++ b/src/limit.lisp
(Continue reading)

Andrej Vodopivec | 16 Dec 16:57 2014
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Re: Maxima 5.35.1



On Tue Dec 16 2014 at 16:40:46 Dr. Wolfgang Lindner <lindnerw <at> t-online.de> wrote:
Hi Andrej, hi Wolfgang,

thanks for your Windows installers.
I have tried both of them using old Windows XP on a Pentium.

Here is what I have found out:

1)  xMaxima (and commandline) is working fine in both versions.
2)  wxMaxima is working fine _after_ canceling an startup error message.
    But: both versions show buttons only in spanish language ..

You can select the language used in the configuration dialog (in the first dropdown menu).

Andrej
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Trond Bakke Fløgstad | 15 Dec 20:24 2014
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Differental operator

Hello
It is possible to make a differental operator in maxima.


L = [  d/dx  ,    0
         0       ,   d/dx]
       

X = [x, 2*x
       1 ,3*x]

Then
L(X) = [ 1
            3 ]




--
Med Venleg Helsing
Trond Bakke Fløgstad
Tlf: 0047 40 44 84 31
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Barton Willis | 16 Dec 04:28 2014

abs_integrate

As an experiment, I added about five lines to abs_integrate. The purpose was for

integration of abs(sin(x)) and abs(cos(x))). Since abs_integrate works by simplification, we get


    (%i21) 'integrate(abs(sin(x)),x);

    (%o21) cos(%pi*floor(x/%pi)+x)/2-cos(%pi*floor(x/%pi)-x)/2+2*floor(x/%pi)


And I think that is correct on the reals. But oops--sans simplification Maxima makes this and that attempts and abs_integrate is able to integrate something giving a huge mess:


(%i22) integrate(abs(sin(x)),x);

(%o22) 4*(abs(sin(x))*(atan(sin(x)/(cos(x)+1))/2
                      +sin(x)/((cos(x)+1)*(2*sin(x)^2/(cos(x)+1)^2+2)))
         /abs(cos(x)+1)
         -(signum(1/(cos(x)+1))*signum(sin(x))*log(2*sin(x)^2/(cos(x)+1)^2+2)
          -signum(1/(cos(x)+1))*signum(sin(x))*log(sin(x)^2/(cos(x)+1)^2+1)
          +signum(1/(cos(x)+1))*signum(sin(x))
                               *(2*sin(x)*atan(sin(x)/(cos(x)+1))/(cos(x)+1)
                                -log(2)))


Obviously this user experience is poor, but I don't know of a non-terrible way to fix it. Is integration of abs(sin(x)) is more neat-o than useful?




--Barton
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Jinsong Zhao | 16 Dec 03:51 2014
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release note

Dear Developers,

Would you please post the release note, or just ChangeLog of new version 
of Maxima on the project homepage? It's very important for the user to 
evaluate if they need to download and re-install the big package.

Best,
Jinsong

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René Kälin | 15 Dec 12:51 2014
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Error in STRCAT

Hello

The following lines work with Maxima 5.26.0 using Lisp SBCL 1.0.52.0-11e4aa5

s:solve((x-1)/(x+3)-(x-4)/(x+5)=(7*x+13)/(x+5)*(x+3),x);
tex1(s[1]);

But with Maxima 5.27.0 using Lisp GNU Common Lisp (GCL) GCL 2.6.7 they throw an error

Maxima encountered a Lisp error:
Error in STRCAT [or a callee]: STRCAT [or a callee] requires less than one hundred fourteen arguments.

I’m not familiar with lisp. Maybe somebody can help me…
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Luigi Marino | 15 Dec 08:20 2014
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maxima 5.35.1

I have tried the last WXMaxima on Maxima 5.35.1
but zn_mult_table and zn_add_table not work.
The last windows release have many problems,
work fine only the release 5.30.0.
Best regards.
Luigi Marino 
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Gmane