21 Oct 16:33 2014

### diagonalize matrix

Hello Everyone!

I started to use wxMaxima today :) and now trying to diagonalize a 3x3 matrix looks like:
matrix( [0,0,a], [0,b,-a], [a,-a,c]).
(a,b,c are all symbolic).

with an example:
assume(a>0,b>0); M : matrix([a,a+b,a+b],[a+b,a,a+b],[a+b,a+b,a]); load("eigen"); [myeigval,myeigvec]:similaritytransform(ev(M,hermitianmatrix));
; however end up with errors
(%o3) "C:/Maxima-5.31.2/share/maxima/5.31.2/share/matrix/eigen.mac"
length: argument cannot be a symbol; found M
#0: eigenvectors(mat=M)(eigen.mac line 107)
#1: uniteigenvectors(m=M)(eigen.mac line 154)
#2: similaritytransform(mat=M)(eigen.mac line 169)
-- an error. To debug this try: debugmode(true);

Could you help me with this?

Thanks!
/Erik
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Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho _______________________________________________ Maxima-discuss mailing list Maxima-discuss <at> lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/maxima-discuss  21 Oct 15:44 2014 ### Get an explanation from Maxima which integration rules have been applied to solve an indefinite integral Hi all, is it possible to get an explanation (or list) from Maxima which integration rules have been applied to solve an indefinite integral? Thanks in advance Klaus Dipl.-Phys. Klaus Rohe Adolf-Kolping-Strasse 10a 85625 Glonn E-Mail: klaus-rohe <at> t-online.de Tel.: +49 (0) 8093 5402 Mobil: +49 (0) 170 8133634 ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for$9/Month.
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20 Oct 19:25 2014

### LISP Compilation

Dear Sirs,

I'm working with wxMaxima (Version 13.04.02, Maxima 5.31.2).
Regarding Compilation of Maxima-Code (Calculation in Maxima) is there
a question. I have no problem to compile the code into LISP. I get the
o-File. But how can I create an executable? I tried already SBCL, GCL
of Maxima and extra installed one.
How is it possible to get an exe-File from Maxima's language?

Of course Maxima is remarkable fast. Much faster than I expected. Thus I thought do some simulations. For this reason I need much more speed.
Are there any further suggestions how the speed could be increased?

Regards,
Markus

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Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho _______________________________________________ Maxima-discuss mailing list Maxima-discuss <at> lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/maxima-discuss  20 Oct 10:40 2014 ### Problem installing Maxima in a windows surfer Hi, I have been trying to install and run maxima at a windows surfer without any success. I download the program but when trying to run it a message appears indicating: This app can't run on your PC To find apps for this PC, open the Windows store Can you help me with this. Thanks, Zaskia Anzalota Sent from my iPod ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for$9/Month.
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20 Oct 03:42 2014

### Unable to solve an integral? Related to the polygarithm function.

Hi people,
I am using Maxima 5.34.0 and I am unsure whether I'm not doing things
the right way or if Maxima is unable to solve an integral.
Here are the 2 commands:

(%i1) f(z):=-4/%pi*integrate(x^2*log(1-z*exp(-x^2)),x,0,inf);
- 4            2                  2
(%o1)      f(z) := --- integrate(x  log(1 - z exp(- x )), x, 0, inf)
%pi
(%i2) f(1);
inf
/                    2
[     2           - x
4 I    x  log(1 - %e    ) dx
]
/
0
(%o2)                   - ----------------------------
%pi
(%i3) float(f(1));
inf
/
[     2                   1.0
(%o3)    - 1.273239544735163 I    x  log(1.0 - -------------------) dx
]                                   2
/                                  x
0.0              2.718281828459045

Where f(z) is supposed to be the polygarithm function of order 5/2. I
wanted to plot it for real values of z between 0 and 1, but I am
unable to do it properly (Maxima would think for too long and I had to
kill the process).
Maybe I should specify that I want z to be real valued?

Also notice that float(f(1));  does not return a float. So it seems
that Maxima is not even able to get a numerical approximation of the
integral for z=1, or I am missing something and I can ask for a
numerical value?

I can't even get the Taylor expansion really:
(%i4) taylor(f(z),z,0,3);
Is z positive, negative or zero?

pos;
!                                   !
inf             !                 inf               !
/            2   !                /              2   !
[     2   - x    !                [     2   - 2 x    !         2
(4 (I    x  %e     dx!     )) z   (2 (I    x  %e       dx!     )) z
]                !                ]                  !
/                !                /                  !
0               !                 0                 !
!z = 0                              !z = 0
(%o4)/T/ ------------------------------- + ----------------------------------
%pi                                %pi
!
inf               !
/              2   !
[     2   - 3 x    !         3
(4 (I    x  %e       dx!     )) z
]                  !
/                  !
0                 !
!z = 0
+ ---------------------------------- + . . .
3 %pi

Thanks guys.

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Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho  19 Oct 23:57 2014 ### inf vs infinity for integration Hello, my piece of mind ... I think that inf , minf and infinity should be treated in a special way e.g. as Richard points out with this enumeration of infinite variables. best regards, Dimiter ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for$9/Month.
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18 Oct 05:15 2014

### inf vs infinity for integration

I found out that in using "inf" and "minf" the integration gives 0(it's wrong as its divergent) but in case of using complex infinity, "infinity" or "-infinity" it returns message that lower bound(ll) and upper bound(ul) to integration must be a real which is still acceptable.

But in my opinion it must give similar error message for "inf"/"minf" or it should say its divergent.
​Or considering the iota/complex part gone​
​ one should always refer to complex infinity(hence reduced to real infinity) as standard infinity in maxima ?​

--
Regards,
Pankaj Sejwal
____________________________________________________
"The more I read, the more I acquire, the more certain I am that I know nothing.” -
Voltaire
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Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho _______________________________________________ Maxima-discuss mailing list Maxima-discuss <at> lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/maxima-discuss  17 Oct 13:38 2014 ### incorrect integration sir, i got -(2)^1.5*cos(t/2) on integrating "m" manually while software gives us upon simplification -(2)^1.5*(cos(t/2))^2 where is the mistake... regards pranav Attachment (maxima.pdf): application/pdf, 6855 KiB ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for$9/Month.
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17 Oct 10:31 2014

### simplify fractional powers

Consider

declare(alpha, noninteger)$assume(alpha > 0)$
assume(alpha < 1)$x: (alpha^(2*alpha/(alpha-1))-alpha^((alpha+1)/(alpha-1)))/((alpha-1)*alpha^(2/(alpha-1))); I know that x=alpha, but could only verify it with factor(map(radcan,distrib(x))); radcan, ratsimp, factor don't simplify the expression. I was wondering if I am missing a flag or something else that would help, or if the solution above is the idiomatic one in Maxima. Best, Tamas ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for$9/Month.
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16 Oct 23:46 2014

### using partial derivative symbol in wxmaxima

Dear all,

I would like wxmaxima to show the latex symbol \partial in a partial
differential equation. Is it possible to:
1) show the \partial symbol (del) in wxmaxima?
2) tell maxima that diff(u(x,y),x) is a partial derivative and that the
\partial symbol should be used?

Best,
Nijso

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Monitor 10 servers for $9/Month. Get alerted through email, SMS, voice calls or mobile push notifications. Take corrective actions from your mobile device. http://p.sf.net/sfu/Zoho  16 Oct 10:52 2014 ### draw3d animation hi, i tried to plot the following function for animation of spring but alas i get each frame instead which needs to be closed to get another frame for thru loop closes after each loop in draw3d graph when i close it anotherr frame appears ...please see to it why its happening for k :0 thru 20 step .01 do draw3d( xrange=[-2,2],yrange=[-2,2],zrange=[0,50], nticks=100, parametric(cos(t),sin(t),(sin(k)+1.2)*t,t,0,8*%pi)); regards pranav ------------------------------------------------------------------------------ Comprehensive Server Monitoring with Site24x7. Monitor 10 servers for$9/Month.
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