jm.evers

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20 sujets de 61 à 80 (sur un total de 149)
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  • en réponse à : maxima load lisp module #4058
    jm.evers
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    thanks , yacas logic seems a good idea ! (never knew…)

    I will give it a try and maybe it’s enough for high_school_level freestyle answer checking.

    Using some software not available on all platforms can not always be avoided. (like Scilab , M2 to name a few)

    en réponse à : maxima load lisp module #4054
    jm.evers
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    Well, in general I was wondering why we can use all kinds of octave packages and not those from maxima. Sure the load command in maxima is powerful, but if used in a chroot environment, it should be no real problem.

    More specific, I’m working on a module about logic…
    where I would like to make use package « logic.mac »
    checking the freestyle answers from pupils (using or,and,not in the answers)

    load("logic.mac");
    test1:(A and B) or C;
    test2:(A or C) and (B or C);
    test3:A and (B or C);
    logic_equiv(test2, test1 );
    logic_equiv(test3, test1 );

    And there are probably more interesting /useful packages available in « /usr/local/share/maxima/ »

    Joke

    • Cette réponse a été modifiée le il y a 7 années et 8 mois par jm.evers.
    en réponse à : maxima load lisp module #4052
    jm.evers
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    Well, I do agree there is no easy solution.
    I’ve proposed a
    feature request for mac. package loading in a chroot environment.

    Joke

    en réponse à : seed #3973
    jm.evers
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    This
    discussion is on the octave seed issues

    joke

    en réponse à : Exécution sécurisée de code #3966
    jm.evers
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    it was a small joke…

    but that’s why you can’t make exercises using perl,python,C,lisp,haskell,ruby etc.etc. in a wims chroot : because they are not installed…however in servers -without the extra security of a chroot- one can try to escape to the « real system » ,when exploiting some « new_and_unknown_to_wims_security_flaw » in the aux. software needed by wims.

    en réponse à : Exécution sécurisée de code #3958
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    A language like python could be incorporated in a chroot environment, for creating programming exercises.
    Escaping a correctly stripped down chroot jail is not very easy…and only managed by very good students 🙂

    en réponse à : Problème d'affichage #3913
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    Hi,

    Well you could say the first one is a feature, the second one is certainly no bug…
    Just try this in normal latex, and you will see that the first one (missing the * operator) is really some service to lazy teachers.
    Use texmath on the equations and all your « bugs » are gone
    \text{f1 = texmath(-8*x^2+112*x-392)}
    Another thing: use the separator « & » when using multicol array

    \begin{array}{lclr}
    c1 & c2 & c3 & c4 \\
    c11 & c22 & c33 & c44 \\
    c111 & c222 & c333 & c444 
    \end{array}
    

    Joke

    • Cette réponse a été modifiée le il y a 8 années et 1 mois par jm.evers. Raison: typo
    • Cette réponse a été modifiée le il y a 8 années et 1 mois par jm.evers.
    en réponse à : Ecrire un système d'équation #3866
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    Sorry, my answer was not complete…If you use createxo, you could try this (avoiding the unbalanced brackets error)

    \statement{
    \(
    \begin{cases}
     \begin{array}{lclr}
       f(x) & = & \sin(x) & (1) \\
       h(x) & = & \sin(x) & (2) \\
       i(x) & = & \sin(x) & (3) \\
       j(x) & = & \sin(x) & (4) \\
       k(x) & = & \sin(x) & (5) 
     \end{array}
    \end{cases}
    )
    }
    

    joke

    en réponse à : Ecrire un système d'équation #3863
    jm.evers
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    in latex mode (math-with-images) the automatic equation numbering is easy…use

    
    \begin{equation}
        f(x) = x^3 
        g(x) = x^4
        h(x) = x^5
      \end{equation}
    

    however in wims mathml this is not -yet- supported…you have to manually add the numbering

    So in wims_mathml use something like

    
    \left\{
     \begin{array}{lclr}
       f(x) & = & \sin(x^{2}) & (1) \\
       h(x) & = & \sin\left(x^{\frac{1}{2}}\right) & (2) \\
       i(x) & = & \sin(2x) & (3) \\
       j(x) & = & \sin(3\cdot x) & (4) \\
       k(x) & = & \sin(\sqrt{x}) & (5) 
     \end{array}
    \right.
    

    hope this helps…
    Joke

    • Cette réponse a été modifiée le il y a 8 années et 2 mois par jm.evers.
    en réponse à : mathml input et tableau de variation #3860
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    all userdraw objects (points,arrows,segments…etc) including inputfields | drag&drop | onclick stuff, can be read with the next js-code (see directexec module)

    <script type="text/javascript">
    //<![CDATA[
    "use strict";
     <!-- will return all 'userdraw' or 'userinput' data from all canvas javascript includes -->
     <!-- will return all 'drag&drop' or 'onclick' data from all canvas javascript includes -->
     function read_canvas(){
      if( typeof popup !== 'undefined' ){
       var fun = popup['read_canvas'+canvas_scripts[0]];
       return fun();
      }
      else
      {
       var script_len = canvas_scripts.length;var draw_reply = "";var found_result = false;for(var p = 0 ; p < script_len ; p++){var fun = eval("read_canvas"+canvas_scripts[p]);if( typeof fun === 'function'){var result = fun();if( result  && result.length != 0){if(script_len == 1 ){ return result;};found_result = true;draw_reply = draw_reply + "["+p+"]="+ result + "\n";};};};if( found_result ){return draw_reply;}else{return null;}
      };
     };
     function read_dragdrop(){
      if( typeof popup !== 'undefined' ){
       var fun = popup['read_dragdrop'+canvas_scripts[0]];
       return fun();
      }else{
       var script_len = canvas_scripts.length;var dragdrop_reply = "";var found_result = false; for(var p = 0 ; p < script_len ; p++){var fun = eval("read_dragdrop"+canvas_scripts[p]); if(typeof fun === 'function'){var result = fun();if( result && result.length != 0 ){if(script_len == 1 ){ return result;};found_result = true;dragdrop_reply = dragdrop_reply + "["+p+"]=" + result +"\n";};};};if( found_result ){return dragdrop_reply;}else{return null;}
      };
     };
    

    canvasdraw info

    note: as for the real answer checking, the sky is the limit…
    Joke

    • Cette réponse a été modifiée le il y a 8 années et 2 mois par jm.evers.
    en réponse à : mathml input et tableau de variation #3847
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    well, using html5&canvas , in createxo something like
    this could be produced
    (of course things in createxo are more complex than directly written in ‘wims phtml’)

    \text{fun=wims(mathmlmath \frac{1}{x^{2}})}
    \text{math_x  = wims(mathmlmath x)}
    \text{plus_infty = wims(mathmlmath +\infty)}
    \text{min_infty = wims(mathmlmath -\infty)}
    
    \text{f = wims(replace internal " by ' in \fun)}
    \text{x = wims(replace internal " by ' in \math_x)}
    \text{infp =  wims(replace internal " by ' in \plus_infty)}
    \text{infm =  wims(replace internal " by ' in \min_infty)}
    
    \text{src=size 400,200
    xrange -5,5
    yrange -1,5
    linewidth 1
    segment -4,3,4,3,red
    segment -3,4,-3,-4,red
    segment 3,4,3,-4,red
    fontfamily Italic 18px Ariel
    centerstring black,3.5,0
    input -1,0,8,1,?
    mathml -4,3.5,0,0,\x
    mathml 3.5,3.5,5,0,\x
    mathml -4,2,0,0,\f
    mathml 3.5,2,5,0,\f
    arrow -3,2,-0.5,0.1,8,blue
    arrow 3,2,0.5,0.1,8,blue
    mathml-3,3.5,0,0,\infm
    mathml 2,3.5,5,0,\infp
    mathml -3,2.3,0,0,\infp
    mathml 2,2.3,5,0,\infm
    
    }
    \text{img=wims(exec canvasdraw \src )}
    
    \statement{
    
    img = \img
    <input type="button" value="click" onclick='javascript:var fun=eval("read_canvas"+canvas_scripts[0]);alert(fun());' />
    }

    instead of calling wims_mathml and replace stuff… (needed for createxo), you could use unicode
    string color,x,y,\unicode

    kind regards,
    joke

    • Cette réponse a été modifiée le il y a 8 années et 2 mois par jm.evers.
    • Cette réponse a été modifiée le il y a 8 années et 2 mois par jm.evers.
    en réponse à : mathml input et tableau de variation #3842
    jm.evers
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    Hi,
    I’m not sure what your problem is, but I guess it’s the \hline…this is not implemented in wims_mathml (item2mml).
    see changelog:

    
    added extra (non LaTeX) option to \begin{array}{} commmand.
    now a single  "-" will produce on all rows a "\hline"
    now "-.-.-" will produce a hline under row1,row3,row5 
    (the MathML code attribute is:  rowlines="solid none solid none solid")
    The options do not adversely interfere with normal latex (for gif)
    
    example:  
    
    \begin{array}{c|c:|c-.-.-.} 
    1 & 2 & 3 \\ 
    1 & 2 & 3 \\ 
    1 & 2 & 3 \\ 
    1 & 2 & 3 \\ 
    1 & 2 & 3 \\ 
    1 & 2 & 3 
    \end{array}                                                                                                
    

    Or in your example:

    \special{mathmlinput [
    \begin{array}{-c|lcccr|}
    x   & -\infty &          & 0     &           & +\infty \\ 
        & +\infty &          &       &           & +\infty \\
    x^2 &         & \searrow &       & \nearrow  &         \\
        &         &          &reply1 &           &         \\ 
    \end{array}],6
    reply1,3}
    • Cette réponse a été modifiée le il y a 8 années et 2 mois par jm.evers.
    • Cette réponse a été modifiée le il y a 8 années et 2 mois par jm.evers.
    • Cette réponse a été modifiée le il y a 8 années et 2 mois par jm.evers. Raison: typos
    en réponse à : navigateur et mathml #3805
    jm.evers
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    Sorry , for my comment…Olivier Bado has said it all

    en réponse à : navigateur et mathml #3802
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    Hi Paul,

    If you use a recent version of wims.cgi
    you should have MathmML support via MathJaX on every browser…except Firefox/Gecko browser family or simply all browsers calling themselves: (navigator.userAgent)
    « gecko », »khtml », »trident » and have native/built-in MathML support (which is much faster than MathJax, of course…)

    Of course you must allow javascript to make use of MathJaX (loading of this library is shown at the ‘bottom’ bar of your browsers)

    hope this helps?
    Joke

    • Cette réponse a été modifiée le il y a 8 années et 3 mois par jm.evers. Raison: typo
    • Cette réponse a été modifiée le il y a 8 années et 3 mois par jm.evers.
    en réponse à : serveur WIMS + OpenBSD -release/-stable #3707
    jm.evers
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    Hi,

    I’ve tested -a few years ago- an install of wims on openbsd using the jailed http-server.
    I did not succeed to get this running properly
    (I’ve forgotten the details…)

    Besides my operating system of choice has always been FreeBSD ,using Apache22|24 and make use of the native chroot system call integrated (as of 2004) in wims.cgi
    All ‘dangerous’ programs are in a chroot-directory

    So while this is not as secure as a complete *BSD jailed httpd server, it will run out of the box.

    However be aware that a few admin-modules within wims use some non posix versions of the programs date|tac|stat and maybe others…so some stuff will not work without tweaking

    kinf regards,
    joke

    • Cette réponse a été modifiée le il y a 8 années et 5 mois par jm.evers.
    en réponse à : Probleme utilisation maxima #3533
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    Hi,
    when you want to use the latest stable wims version there are -in my opinion- two sensible(*) options:

    1) install a newer version of linux along with the
    « latest » stable software for wims (maxima/pari/octave etc). This would take a few hours

    2) only install the latest software needed by wims
    via a chroot. In that way you can keep your linux installation. This method would take you 50 seconds…

    But it’s not my call to make 🙂

    kind regards,
    Joke Evers
    (*)
    to avoid bugs&flaws in both modules and aux software

    en réponse à : Probleme utilisation maxima #3508
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    Hi,
    You may want to save yourself a lot of trouble and try using maxima (and the rest) from a chroot system. (only 64bit linux)
    http://wims.unice.fr/download/wims/chroot/wims-4.12.chroot64.linux.tar.bz2

    After install, just run as root
    /home/wims/bin/setchroot

    Joke

    en réponse à : Un vecteur peut il est attendu comme réponse ? #3443
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    Hi,

    I guess adding extra coordinates to the correct answer should do, something like

    
    \answer{}{[\dessin];arrows,0,0,5,5,0,0,-5,-5,0,0,-2,4}{type=draw}

    However I´m not sure if the scoring system will count a ´half´ correct answer…
    If you want pupils to use calculated coordinates ( instead of trying to draw very precise…) use command userinput_xy
    Read the docs from
    canvasdraw.html to adjust to your liking.

    Joke

    • Cette réponse a été modifiée le il y a 9 années par jm.evers. Raison: typos
    en réponse à : Un vecteur peut il est attendu comme réponse ? #3437
    jm.evers
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    Hi,
    Regarding ‘canvasdraw’ :
    some documentation on the implemented command syntax may be found in the wims-distribution : ~/src/Misc/canvasdraw/canvasdraw.html)
    or here : canvasdraw.html

    note: the basic syntax for draw primitives are more or less the same as for ‘draw / flydraw’

    kind regards,
    Joke

    • Cette réponse a été modifiée le il y a 9 années par jm.evers. Raison: typo
    en réponse à : texmath #3354
    jm.evers
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    Oh,
    just try:

    \integer{d=-2}
    \text{A = wims( rawmath (x-\d)(x+\d) )}
    \text{D=texmath(\A)}
    \statement{A=\A <br/> D = \D <br/> D= \( \D \)}

    • Cette réponse a été modifiée le il y a 9 années et 2 mois par jm.evers.
20 sujets de 61 à 80 (sur un total de 149)