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uxor :verified: · @uxor
209 followers · 905 posts · Server mastodon.xyz

: des ? c'est l'occasion de refaire une petite !

Je suis prof de que j'enseigne à de futurs ingénieurs, donc vous verrez dans ma TL , , , en particulier , programmation avec ou et parfois un peu de .

Je suis aussi passionné par , et aussi et

#introduction #nouveauici #presentationfr #mathematiques #maths #sciences #informatique #logiciellibre #scilab #gnuoctave #maxima #wxmaxima #moodle #astronomie #astrophotographie #trail #running #velo #bienvenus

Last updated 1 year ago
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uxor :verified: · @uxor
205 followers · 888 posts · Server mastodon.xyz
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I've found a lot of situations where and fail to compute indefinite limits
of functions involving trigonometric expressions as x tends to infinity.

f:(4*x^3+2*x^2*sin(x)+1)/(x+1)^2;
limit(f-x*4,x,inf); # should be ind

A work-around in Maxima is to force a ratsimp before the limit, but this doesn't work with SageMaths ...🤦‍♂️

I made a but they are a lot of similar cases already reported :

sourceforge.net/p/maxima/bugs/

#maxima #sagemaths #bugreport #mathematics #mathematiques #wxmaxima #sage

Last updated 1 year ago
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Khurram Wadee ✅ · @mkwadee
1354 followers · 12798 posts · Server mastodon.org.uk
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A simple model for it might be to assume it is a fluid offering resistance proportional to the velocity of the projectile, i.e. R = -k.v, where v is the velocity vector and k is a constant which dictates how viscous the fluid is.

Happily, this model has exact solutions so I didn’t need to do any numerical integration. Here are four different cases, including the ideal case k = 0. The others are k = 0.1, 1 and 10, with the k=1highlighted. Pt2...

#linear #viscous #mywork #ccbysa #maths #wxmaxima

Last updated 1 year ago
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AAA365 · @AAA365a
198 followers · 1380 posts · Server ohai.social

Khurram Wadee ✅ (@mkwadee)
Engineer interested in nonlinear mechanics and science & maths in general. Also, politics & humour.

The animation in my header is a demonstration of Kepler's Second Law of Planetary Motion (CC-BY-SA) -- see en.wikipedia.org/wiki/Kepler%2

You can check out others mathematical animations by me by searching for .

Also, you can find my photographs by searching for . But please note that of course neither of these hashtags is unique to me.

#wxmaxima #d7000

Last updated 1 year ago
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Khurram Wadee ✅ · @mkwadee
1312 followers · 12263 posts · Server mastodon.org.uk
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I was explaining to my wife how the of an idealized differ. She was having some problems understanding that only the component changes and that the component remains constant. In the end, I knocked up this little animation to tr and explain pictorially (the program in is actually interactive. so you can stop it, step through it or run it backwards).

#velocity #components #projectile #vertical #horizontal #wxmaxima #maths #mathematics #mechanics #constantacceleration #vectors #dynamics #ccbysa

Last updated 1 year ago
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Khurram Wadee ✅ · @mkwadee
1312 followers · 12263 posts · Server mastodon.org.uk

I was explaining to my wife how the of an idealized differ. She was having some problems understanding that only the component changes and that the component remains constant. In the end, I knocked up this little animation to tr and explain pictorially (the program in is actually interactive. so you can stop it, step through it or run it backwards).

#velocity #components #projectile #vertical #horizontal #wxmaxima #maths #mathematics #mechanics #constantacceleration #vectors #dynamics #ccbysa

Last updated 1 year ago
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uxor · @uxor
173 followers · 1860 posts · Server mastodon.xyz
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encore environ 200 questions de QCM créées en quelques jours pour les insérer dans mes modules d'enseignement sur . Des lots de questions avec feedbacks générés avec et sous forme de fichiers au format gift ou xml .

#vacancesdeprofs #moodle #scilab #wxmaxima #gnuoctave

Last updated 2 years ago
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Khurram Wadee ✅ · @mkwadee
1178 followers · 11540 posts · Server mastodon.org.uk

@ericsfraga @ademalsasa You check some of the plots and animations I've made by searching for on here.

#wxmaxima

Last updated 2 years ago
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uxor · @uxor
159 followers · 1726 posts · Server mastodon.xyz

@duke62 @framaka

j'ai appris tout récemment que l'équipe de a été rachetée par Dassault System ...😞 La syntaxe de est proche mais un peu différente de matlab sur certains points, parcontre il y a aussi dont la syntaxe est la même que matlab (le mainteneur J. Eaton était aussi chez ESI Group). Pour le calcul formel ne pas oublier (et ) et (qui utilise maxima au travers d'une console Ipython)

#scilab #gnuoctave #maxima #wxmaxima #sagemath

Last updated 2 years ago
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Khurram Wadee ✅ · @mkwadee
1032 followers · 10917 posts · Server mastodon.org.uk
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In , are used to depict the variation of quantity at a particular location as the location of a or is changed. In the shown, we can see the change in in a as a unit force moves from one end to the other. The and the influence line for bending moment at the centre of the left-hand span, B, are shown.

#structuralengineering #analysis #InfluenceLines #load #action #animation #BendingMoment #StaticallyDeterminate #beam #BendingMomentDiagram #mywork #ccbysa #wxmaxima #freesoftware #animatedgif

Last updated 2 years ago
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Khurram Wadee ✅ · @mkwadee
1034 followers · 10917 posts · Server mastodon.org.uk
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are found in many aspects of nature such as in the growth of and the form of . They have a lot of interesting properties and this highlights just one of them. It shows that the (here denoted as ⍺) is constant, being the angle that the of the spiral makes with the tangent of any circle centred at the origin.

#LogarithmicSpirals #snail #shells #spiral #galaxies #geometric #animation #PolarAngle #tangent #MathsForTheDay #mathematics #maths #geometry #wxmaxima #freesoftware

Last updated 2 years ago
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Khurram Wadee ✅ · @mkwadee
1034 followers · 10917 posts · Server mastodon.org.uk

These animations required me to learn the of and I had to find out what terms like , and are. It also requires the of one algebraic equation, which was fun to investigate. All the details are on the page for Kepler’s Laws here:
en.wikipedia.org/wiki/Kepler’s

#mathematics #CelestialMechanics #MeanAnomaly #EccentricAnomaly #TrueAnomaly #NumericalSolution #wikipedia #mywork #maxima #wxmaxima #freesoftware #physics #astronomy #animatedgif #animation #ccbysa

Last updated 2 years ago
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Khurram Wadee ✅ · @mkwadee
1034 followers · 10918 posts · Server mastodon.org.uk
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This little graphical demonstration shows one example of such a state. The was produced a routine written in . 2/2

#animatedgif #wxmaxima #mathematics #TheoryOfElasticity #mechanics #SolidMechanics #engineering #mywork #ccbysa #workinprogress #freesoftware

Last updated 3 years ago
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uxor · @uxor
159 followers · 1726 posts · Server mastodon.xyz

#wxmaxima #maxima #mathematics #maths

Last updated 4 years ago
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uxor · @uxor
159 followers · 1726 posts · Server mastodon.xyz

I made a on the simplify_sum bug I discovered 3 weeks ago. I don't know if the problem comes from the Zeilberger/Gosper algorithm or a lack of knowledge on some special functions ....

sourceforge.net/p/maxima/bugs/

#mathematics #maths #maxima #wxmaxima #bugreport

Last updated 5 years ago
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uxor · @uxor
159 followers · 1726 posts · Server mastodon.xyz

I've just learned today that finding a closed form for the limit of some series relies on Gosper's algorithm which was first implemented in (the kernel). The algorithm reduce the problem to finding some polynomial solving a system of linear equations ...❤️

en.wikipedia.org/wiki/Gosper%2

#mathematics #maths #macsyma #wxmaxima

Last updated 5 years ago
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Khurram Wadee ✅ · @mkwadee
1035 followers · 10918 posts · Server mastodon.org.uk

@uxor I use the which has an additional function called in which you can create an animation as a parameter is varied. It's a simple matter of exporting that as an .

#wxmaxima #frontend #with_slider #animated #gif

Last updated 5 years ago
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Khurram Wadee ✅ · @mkwadee
986 followers · 10873 posts · Server mastodon.org.uk
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I was explaining to my wife yesterday how gives us a way to find the of a at any point and to illustrate it I wrote a short routine in to draw the to any point on a graph of a function. Here we see the example for the and functions, x^2 and 1/x i.e. a and a respectively.

#DifferentialCalculus #gradient #function #maxima #tangent #Quadratic #reciprocal #parabola #hyperbola #mywork #gif #animatedgif #ccbysa #wxmaxima #mathematics #maths #calculus #differentiation

Last updated 5 years ago
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uxor · @uxor
159 followers · 1726 posts · Server mastodon.xyz
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there was a last way to check where does the problem comes from : compute the numerical value of closed form given by and using ... so there is a bug in simplify_sum used by and !

#mathematics #maths #wxmaxima #sage #wolframalpha #maxima

Last updated 5 years ago
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uxor · @uxor
159 followers · 1726 posts · Server mastodon.xyz
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for those who think that the problem comes from only you can check that do the same computations . But the question is why ? is the simplification false or is the numerical value of erf function at complex value i wrong?

#mathematics #maths #wxmaxima #sage

Last updated 5 years ago
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