Mixon, Wilson | 26 Apr 22:32 2015

A problem in limit

I want to evaluate the following:


u:(a/x^b + (1-a)/y^b)^(-1/b)$

limit(u,b,0);

radcan(limit(u,b,0));



Results from online Maxima (CESGA):

.


This is what I expected and what earlier Maxima versions have yielded.




Results of first two commands in wxMaxima, after a long wait:


Maxima encountered a Lisp error:

Error in PROGN [or a callee]: Bind stack overflow.

Automatically continuing.

To enable the Lisp debugger set *debugger-hook* to nil.


Using xmaxima yields the same results. Here's the version information:

wxMaxima version: 14.12.1
Maxima version: 5.32.1

I've tried this on three different post 5.3 versions with similar results. 

Suggestions?

Thanks,

Wilson Mixon​



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Alexander Gofen | 26 Apr 07:36 2015

Writing output file for other application

Dear Colleague,

Please help me in creation a batch file for maxima which will be used 
in another application in the following scenario.

1) My application (in Delphi) calls maxima as a command line with a 
parameter specifying a batch file generated inside my application:

  ....\wxmaxima /o BatchFile.wxm

This batch file will contain several text lines with maxima 
instructions to extract real and imaginary parts from complex 
algebraic expressions

realpart(...)
imagpart(...)				(1)
realpart(...)
imagpart(...)
. . . .

The goal is that maxima create an output file containing the results 
of the lines above, then close the output file, and close itself 
(without any dialog).

2) From the User Manual I do not understand

   - How to open such text output file Results.wxm; I guess with 
writefile(Results);

   - How to write the text output from each line (1) into Results.wxm;

   - How to close Results.wxm; I guess closefile();

   - How to close the program wxmaxima with its own instruction and 
without any prompts.

Can you help please?

Sincerely,

Alexander Gofen 

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Gunter Königsmann | 26 Apr 11:03 2015
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Absurd question about output labels

Dear all,


There was a feature request for wxMaxima to hide maxima's input and show only its output.
Since wxMaxima allows to write as many comments and headings (that are shown) documents actually look quite good with this option enabled for export. But good documents are hard to read afterwards since without the input there are no more persistent labels. There still is %o3, %o5  and so on. But these labels change whenever the user adds new cells before %o3 and %o5. I personally tend to assign readable (and persistent) labels to everything is referenced later:

%i1   Voltage: U*exp(-2*t)
%o1   U*exp(-2*t)

Is there a not too-hard-to-archive way for maxima to include this label in the output instead of the automatically assigned one like in:

%i1   Voltage: U*exp(-2*t)
Voltage   U*exp(-2*t)

Don't know if this is a good idea or if it actually is worth a feature request so I thought, I'd better ask.

Thanks a lot,
and kind regards,

   Gunter.
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Gunter Königsmann | 25 Apr 19:33 2015
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Re: Executable size

When many "if"s are involved the last gcl releases tended to quickly run out of memory and run real slow due to a maxima bug. Perhaps this setting can make gcl faster than sbcl again: gcl is always told to have the potential to run real fast.


Kind regards,

   Gunter.

On Fr, Apr 24, 2015 at 5:58 , Camm Maguire <camm <at> maguirefamily.org> wrote:
Greetings! It has come to our attention that significant performance gains can be had when using more memory if available. This suggests two modes, one tight mode using more gc in preparation for dumping a small disk image (aka maxima build time), and one more expansive mode not to be dumped to disk for optimal end user calculations. At present, gcl-2.6.13pre toggles these with a variable setting and a function call. It might be more convenient to also read an environment variable and override, but it might also be more confusing. Thoughts on this most welcome. Take care,
--
Camm Maguire camm <at> maguirefamily.org ========================================================================== "The earth is but one country, and mankind its citizens." -- Baha'u'llah ------------------------------------------------------------------------------ One dashboard for servers and applications across Physical-Virtual-Cloud Widest out-of-the-box monitoring support with 50+ applications Performance metrics, stats and reports that give you Actionable Insights Deep dive visibility with transaction tracing using APM Insight. http://ad.doubleclick.net/ddm/clk/290420510;117567292;y _______________________________________________ Maxima-discuss mailing list Maxima-discuss <at> lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/maxima-discuss
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sys | 24 Apr 17:17 2015

How use wxMaxima to define unknow function and then diff?

HI:
    I want to use wxMaxima to derive complicated part differential equations.
For example,one of the equation (from Maxwell equations)is
  F_1(x_0,x_1,x_2,x_3,w_1,w_2,w_3,m_1,m_2,m_3):= diff(w_2,x_0)-diff(m_3, x_1)+diff(m_1,x_3);
  F_1 = 0;
where w_1,w_2,w_3,m_1,m_2,m_3 all are the function of x_0, x_1,x_2,x_3,but the form is unknown(I don't known how to define unknown function).
    Then I want to calculate
         diff(F_1,x_0),
The result is 0.But I hoped it is of second order terms,such as diff(w_2,x_0,2),and then substitute other equation 
into the result.
  How can I obtain the effect?
Thanks
Shu shengYu




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Andreas Brusinsky | 23 Apr 19:15 2015
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Re: dual numbers

So after a while .. two more questions:
 
Yes "dual numbers" are hypercomplex numbers so are there already
some 'hypercomplex' rules in the package's or contrib's?
 
And how could/would I possibly attach 'dual number'-'definitions' to current "realpart(...)" to give
the real part of a 'dual number'?
 
And also attach possibly something like "dualpart(expression)" besides "imagpart()"?
 
  Thanks for your many responses.
 
  Andreas

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Mike Valenzuela | 23 Apr 01:30 2015
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Plot2D gnuplot change point size?

Hello all,

I'm sure there is an easy answer to this, but I've not had any luck finding the answer. When plotting a bunch of points, how can I change the point size? I'm using gnuplot through Maxima. I've looked under set plot options and I've have tried a few things with gnuplot_preamble and gnuplot_postamble, but I've had no luck.



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Evan Cooch | 22 Apr 20:47 2015
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bug(s) with wxMaxima/maxima 5.36 Win release

Greetings -- [apologies if this duplicates an earlier submission about 
same -- having some issues getting things beyond the mail queue]

Been using SBCL-based 5.35.1.2 under Win 7 without problems. Decided to 
try the 'upgrade' to 5.36.0 this morning. Installation proceeds without 
error, but when I double-click a Maxima worksheet, throws the following 
two errors,, for both the SBCL and openMCL versions:

../src/msw/bitmap.cpp(922): asset "image.IsOk()" failed in 
CreateFromImage(): invalid image
Do you want to stop the program?
You can choose cancel to suppress further warnings.

If I click cancel, I get the second error:

Failed to load image from file "C:\\program Files 
(x86)\Maxima-sbcl-5.36.0\wxMaxima\wxMaxima.exeart/toolbar/gtk-help.png"

[Note how the slashes change direction in the path statement in the 
error message -- I suspect this is diagnostic. Maybe...]

Now, if I keep pushing forward, Maxima opens, but all the graphics 
(icons) on the toolbar are missing.

But...if I start Maxima, and then read in the worksheet, no problem. No 
error messages, no missing icons. The problem only arises if I try to 
open a worksheet by double-clicking it.

Replicated on 3 different Windows 7 based machines.

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Robert Dodier | 20 Apr 20:51 2015
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Re: Errors in GCL Maxima

On 2015-04-19, Ira Deutsch <ideutsch763 <at> yahoo.com> wrote:

>   While runnng the testsuite, these errors cropped up in GCL Maxima.
> For Maxima 5.34.1.

Thanks for taking the time to try it. There is a new version, 5.36.0.
Perhaps you can test that version. Can you also include the output
from build_info(); as well.

best,

Robert Dodier

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Andrey G. Grozin | 20 Apr 10:34 2015
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Re: Errors in GCL Maxima

What version of gcl do you use? I use gcl-2.6.12, and there are no 
testsuite failures for recent versions of maxima (5.36.0, 5.35.1, 5.34.1, 
...)

You can also try sbcl, the current version is 1.2.10. Both gcl and sbcl 
are much faster than clisp.

Andrey

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Antonio Lapira | 19 Apr 22:04 2015
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maxima for centos 7

isn't there an rpm for x86_64 linux?
I'm using centos 7 and I'd like to install maxima.. how to do? do I need to compile it?

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