## maxima-lang-fr — French-language discussion of the Maxima computer algebra system

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Showing 3 results of 3

 Re: [Maxima-lang-fr] find_root From: Robert Dodier - 2007-12-22 00:16:43 ```On Dec 20, 2007 4:13 AM, wrote: > f(x):= float(x+x^2)\$ > B(x):=x+1\$ > N(x):=romberg(f(u),u,-10,B(x))\$ > wxplot2d( '[N(x)], [x, 0.3,0.4] )\$ > find_root(N-285,x,0.3,0.4); > > En reponse, Maxima me donne le graphe de la fonction comme je lui ai > demande et m'ecrit aussi > > > (%o6) find_root(N-285,x,0.3,0.4)(See attached file: Maxima_graph.png) > > J'ai demande a Maxima la solution de l'equation N(x)=285 mais je n'arrive > pas a lui faire sortir la solution approchee. Comment faire pour avoir un > nombre en retour et pas > (%o6) find_root(N-285,x,0.3,0.4) ? Cyril, I think you meant to write find_root (N(x) - 285, x, 0.3, 0.4); for which I get 0.32935576297938 in response. (Maxima doesn't try to automatically construct a function when it sees the N - 285. Perhaps it could do so, but that is beyond the scope of solving this particular problem.) Hope this helps, Robert Dodier ```
 Re: [Maxima-lang-fr] Encore un probleme (fonction reciproque) ! From: Robert Dodier - 2007-12-22 00:12:53 ```On Dec 20, 2007 9:07 AM, wrote: > f(x):=x\$ > g(A):=romberg(f(q),q,0,A)\$ > phi(u):=g(u)-0.2\$ > find_root(phi,u,0,4); > f(x):=x\$ > g(A):=romberg(f(q),q,0,A)\$ > find_root((g(u)-0.2),u,0,4); > f(x):=x\$ > g(A):=romberg(f(q),q,0,A)\$ > phi(u,v):=g(u)-v\$ > psi(v):=find_root(phi(u,v),u,0,4); > psi(0.2); Cyril, I apologize for writing English here. I believe these examples all yield the expected result with the most recent version of Maxima (namely, the Maxima 5.14.0 release candidate, which you can obtain from Sourceforge). The evaluation of the romberg function was modified after Maxima 5.13.0. Hope this helps, Robert Dodier PS. Here is what I see: (%i1) build_info (); Maxima version: 5.13.99rc1 Maxima build date: 21:32 12/4/2007 host type: i686-pc-mingw32 lisp-implementation-type: GNU Common Lisp (GCL) lisp-implementation-version: GCL 2.6.8 (%o1) (%i2) f(x):=x\$ (%i3) g(A):=romberg(f(q),q,0,A)\$ (%i4) phi(u):=g(u)-0.2\$ (%i5) find_root(phi,u,0,4); (%o5) 0.63245553203368 (%i6) find_root((g(u)-0.2),u,0,4); (%o6) 0.63245553203368 (%i7) phi(u,v):=g(u)-v\$ (%i8) psi(v):=find_root(phi(u,v),u,0,4); (%o8) psi(v) := find_root(phi(u, v), u, 0, 4) (%i9) psi(0.2); (%o9) 0.63245553203368 ```
 Re: [Maxima-lang-fr] =?iso-8859-1?q?=E9crire_du_latex_dans_un_fichier?= =?iso-8859-1?q?_=E0_partir_de_maxima?= From: Robert Dodier - 2007-12-22 00:04:32 ```Hello Phillippe, I will try to help, but I cannot write the French language (despite my name). On Dec 20, 2007 1:33 PM, philippe wrote: > path:"C:/Documents\ and\ Settings/philippe/Mes\ > documents/informatique/maxima/essai_with_stdout/essai.tex"; > tex("une int=E9grale en \\latex :",path)\$ > > mais =E7a ne marche pas (path est ignor=E9 rien n'est envoy=E9 =E0 la fin= du > fichier. I tried exactly this. (%i1) path:"k:/temp/tmp.tex"; (%o1) k:/temp/tmp.tex (%i2) tex(x + y, path); (%o2) false (%i3) printfile(path); \$\$y+x\$\$ (%o3) k:/temp/tmp.tex So it seems to work OK. I am using Maxima 5.13.0 on Windows XP. > -Ensuite je ne peux pas envoyer du texte (=3Dpas une formule math=E9matiq= ue) > de cette mani=E8re l=E0. Par exemple : > > tex("une int=E9grale en \\latex :","C:/.../essai.tex")\$ > > envoie dans le fichier tex : > > \$\$\mbox{{}une int=E9grale en \latex :{}}\$\$ tex(...) always puts ... in a math formula environment. If you want plain text, just write print(...). E.g. with_stdout ("C:/.../essai.tex", print ("une int=E9grale en \\latex :"), tex ('integrate (sin(x), x))); Hope this helps! Robert Dodier ```

Showing 3 results of 3