Activity for gk-v
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gk-v posted a comment on discussion Help
Use ytick(Label(align=W),(0,4),W);
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Just copied an example NURBSsurface.asy to http://asymptote.ualberta.ca and get an error message: triple[][] P=scale3(20)*octant1.P; ^ workspace_1.asy: 63.32: no matching variable 'octant1.P'
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This could be done in many ways, here is one: import Lsystem; size(10cm,0); Lsystem SierpinskiCurve1= Lsystem("YF", new string[][]{{"X","YF+XF+Y"},{"Y","XF-YF-X"}}, La=60, Lai=0); Lsystem SierpinskiCurve2= Lsystem("YF", new string[][]{{"X","YF+XF+Y"},{"Y","XF-YF-X"}}, La=60, Lai=0); Lsystem SierpinskiCurve3= Lsystem("YF", new string[][]{{"X","YF+XF+Y"},{"Y","XF-YF-X"}}, La=60, Lai=0); SierpinskiCurve1.iterate(1); path g=SierpinskiCurve1.paths()[0]; SierpinskiCurve2.iterate(2); path h=SierpinskiCurve2.paths()[0];...
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The png image above was produced with the standard options for such 3D surfaces asy -f png -render=4 Also, you can get a vector pdf file with just the curves of intersection: settings.outformat="pdf"; settings.prc=false; import graph3; size(200); currentprojection=orthographic((0.5,0.5,1)); real f(real x, real y, real z) {return y^2 + (z - 2)^2 - 4;} real g(real x, real y, real z) {return (x^2 + y^2 + z^2 + 8)^2 - 36*(x^2 + y^2);} arrowbar arr=Arrow(HookHead,size=2); draw(project(O--X),red+0.7bp,arr);...
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Luckily, in this case we can find the intersection of the two surfaces in parametric form, expressing $x$ and $y$ coordinates of the intersection curve(s) in terms of $z$ and using $z$ as a parameter, varying from $0$ to $1$. The intersection curve is then a piece-wise parametric curve. Here is the code: import graph3; import smoothcontour3; size(200); currentprojection=orthographic((0.5,0.5,1)); real f(real x, real y, real z) {return y^2 + (z - 2)^2 - 4;} real g(real x, real y, real z) {return (x^2...
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Cyclic array is a convenient feature, as well as the in-place anonymous array. Question: Is there any standard way to set a cyclic flag for a new anonymous array used, say, as an argument of a function? For example, let's assume that function f accepts an array argument a and either fill the closed area or just draw the outline, depending on the .cyclic flag of that array: import graph; void f(pair[] a, pen p=currentpen){ guide g=graph(a); if(a.cyclic){ g=g..cycle; fill(g,p); } else draw(g,p); }...
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Try var mypen=rgb(.6,.6,1)+opacity(.7); // or // var mypen=emissive(white+opacity(.6)); //
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You can also check out a couple of related examples at TeX.SE: filling-in the closed parts of a typeface glyph and can-i-visualize-the-bezier-control-points-of-a-letter-in-tex.
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Something similar: settings.outformat="pdf"; size(9cm); path[] Lpath=texpath(Label("testing")); pair ll=min(Lpath); pair ur=max(Lpath); pair ul=(ll.x,ur.y); pair lr=(ur.x,ll.y); filldraw(Lpath,deepblue); draw(box(ll,ur),orange+0.2bp); dot("ll",ll,plain.SW,UnFill); dot("ur",ur,plain.NE,UnFill); dot("ul",ul,plain.NW,UnFill); dot("lr",lr,plain.SE,UnFill);
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Hmmm... Are you going to check if the surface is one-sided, like a Mobius strip?
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As a user of the Asymptote, I agree that it is also a great tool for leaning and doing programming. For your students I would suggest to use a TeXLive distribution, which includes ready-to-use Asymptote. Well yes, it's quite big, but it contains all dependencies and as far as I know, the installation needs minimal user efforts. For such math-intensive subject your students will benefit in using LaTeX anyway, so the earlier they start to use it, the better.
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Try, for example, draw(Labels[i],cont[i][j],p[i],arrow=ArcArrow(HookHead,size=3,position=Relative(i/cont.length))); The argument of Relative is a real number from 0 (the beginning of the path to 1 (the end of it). To reverse direction of the arrow use BeginArcArrow with the same parameters instead. If it's possible to calculate somehow a direction/position of all arrows from the index, like in this example, use this function. Otherwise you can always prepare an array of manually specified arrows...
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Something like this? import contour; size(200); real f(real x, real y) {return x^2-y^2;} int n=10; real[] c=new real[n]; for(int i=0; i < n; ++i) c[i]=(i-n/2)/n; pen[] p=sequence(new pen(int i) { return ( (c[i] >= 0 ? solid : dashed)+fontsize(6pt)); },c.length); Label[] Labels=sequence(new Label(int i) { return Label(c[i] != 0 ? (string) c[i] : "" ,Relative(unitrand()),(0,0),UnFill(1bp)); },c.length); guide[][] cont=contour(f,(-1,-1),(1,1),c); for(int i=0;i<cont.length;++i){ for(int j=0;j<cont[i].length;++j){...
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Obviously, you've spotted a typo in the docs. The function arcpoint is defined in ../base/plain_paths.asy as // return the point on path p at arclength L pair arcpoint(path p, real L) { return point(p,arctime(p,L)); } Also, the interactive mode shows this definition: $ asy Welcome to Asymptote version 2.61 (to view the manual, type help) > arcpoint <pair arcpoint(path p, real L)> >
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Try to play with fuzz, for example, real[][] A = intersections(p,kn,fuzz=1e-12);
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Are you asking about pen invisible; This special pen writes in invisible ink, but adjusts the bounding box as if something had been drawn (like the \phantom command in TEX).
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One way to fix this is to use $intersectionpoints$ instead: dot("$N$",intersectionpoints(reverse(dca),M--A)[0],plain.NE); since there are naturally two intersection points. OK, let's see what we can find in the docs (asymptote.pdf). pair[] intersectionpoints(path p, path q, real fuzz=-1); returns an array containing all intersection points of the paths p and q. That's exactly what one would need when the two paths clearly have more than one intersection point. On the other hand, pair intersectionpoint(path...
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One way to fix this is to use $intersectionpoints$ instead: dot("$N$",intersectionpoints(reverse(dca),M--A)[0],plain.NE); since there are naturally two intersection points. OK, let's see what we can find in the docs (asymptote.pdf). pair[] intersectionpoints(path p, path q, real fuzz=-1); returns an array containing all intersection points of the paths p and q. That's exactly what one would need when the two paths clearly have more than one intersection point. On the other hand, pair intersectionpoint(path...
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One way to fix this is to use intersectionpoints instead: dot("$N$",intersectionpoints(reverse(dca),M--A)[0],plain.NE); since there are naturally two intersection points in this case .
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As suggested, added a copy of an issue Unexpected four points of Circle/Circle intersection.
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I've checked several previous versions, and it looks like some changes were introduced (fuzz usage?) in version 2.48: the same code results in: // asymptote-2.47~~~ // // 0: (-0.560237885523118,0.828331764225293) // 1: (-0.560237885562501,-0.828331764198656) // // 0: (-0.560042915644411,0.828463597653214) // 1: (-0.560042915682286,-0.828463597627611) // // asymptote-2.48 // 0: (-0.560224859385282,0.828340574236673) // 1: (-0.560253448908069,-0.82832123779764) // // 0: (-0.560021536906841,0.82847804931724)...
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// Asymptote version 2.61 [(C) 2004 Andy Hammerlindl, John C. Bowman, Tom Prince] // // ENABLED OPTIONS: // WebGL 3D HTML rendering // OpenGL 3D OpenGL rendering // GSL GNU Scientific Library (special functions) // FFTW3 Fast Fourier transforms // XDR external data representation (portable binary file format) // Readline interactive history and editing // Sigsegv distinguish stack overflows from segmentation faults // GC Boehm garbage collector // // DISABLED OPTIONS: // import graph; size(6cm);...
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Try earthVelUnit=dir(earthOrbit, 3.6);
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And this is completely valid position. But the question, however, is: why the archive is named asymptote-2.42.i386.tgz? This is confusing. The user sees i386 in a name, downloads it, and is surprised that asy is not working. P.S. I've found this by chance, it's not that I need this 32bit file, just want to point out that such inconsistency can be a source of unnecessary frustration, which can be easily avoided.
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Is the executable found in asymptote-2.42.i386.tgz supposed to be 64-bit? /2.42/usr/local/bin$ file asy asy: ELF 64-bit LSB executable, x86-64, version 1 (GNU/Linux), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 3.2.0, BuildID[sha1]=da40173797555098b397e0881ea3cc7d676a8fe2, not stripped
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Try surface s=surface(f,(0,0),(1,pi),100,Spline);
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Great thanks for the update. Testing v.2.33: when compiling 3d-scenes, for example,...
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Great thanks for the update. Testing v.2.33: when compiling 3d-scenes, for example,...
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Use separate brackets instead: write(A[0][0][0]);
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Check out this thread: http://sourceforge.net/p/asymptote/discussion/409349/thread/7261ab22/?limit=25#2a89...
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