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Sep 20th, 2018
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  1. documentclass{article}
  2. usepackage[utf8]{inputenc}
  3. usepackage{tikz}
  4. usepackage{pgfplots}
  5. usepackage{amsmath}
  6. pgfplotsset{compat=1.12}
  7.  
  8. begin{document}
  9. begin{figure}[ht]
  10. centering
  11. begin{tikzpicture}
  12. begin{axis}[
  13. width=0.6textwidth,
  14. view={0}{90},
  15. domain=0:2*pi+0.5,
  16. y domain=0:2*pi+0.5,
  17. xmax=2*pi+1, ymax=2*pi+1,
  18. samples=15,
  19. axis equal image,
  20. axis lines = center,
  21. xtick = {0,3.14,6.28},
  22. ytick = {0,3.14,6.28},
  23. xticklabels = {0,$pi$,$2pi$},
  24. yticklabels = {0,$pi$,$2pi$}
  25. ]
  26. addplot3 [blue, quiver={u={1}, v={sin(deg(x))^2}, scale arrows=0.3, every arrow/.append style={-latex}}] (x,y,0);
  27. addplot [thick, red] {2-sin(deg(x))*cos(deg(x))/2+x/2};
  28. end{axis}
  29. end{tikzpicture}
  30. caption{Retningsfelt (blå) for $dfrac{d x}{d t}=sin^2(t)$, med løsningskurve (rød) gennem $x(0)=2$.}
  31. label{fig:bvp1}
  32. end{figure}
  33. end{document}
  34.  
  35. documentclass{article}
  36. usepackage[utf8]{inputenc}
  37. usepackage{tikz}
  38. usepackage{pgfplots}
  39. usepackage{amsmath}
  40. pgfplotsset{compat=1.12}
  41.  
  42. begin{document}
  43.  
  44. Original code
  45. begin{tikzpicture}
  46. begin{axis}[
  47. width=0.6textwidth,
  48. view={0}{90},
  49. domain=0:2*pi+0.5,
  50. y domain=0:2*pi+0.5,
  51. xmax=2*pi+1, ymax=2*pi+1,
  52. samples=15,
  53. axis equal image,
  54. axis lines = center,
  55. xtick = {0,3.14,6.28},
  56. ytick = {0,3.14,6.28},
  57. xticklabels = {0,$pi$,$2pi$},
  58. yticklabels = {0,$pi$,$2pi$}
  59. ]
  60. addplot3 [blue, quiver={u={1}, v={sin(deg(x))^2}, scale arrows=0.3, every arrow/.append style={-latex}}] (x,y,0);
  61. addplot [thick, red] {2-sin(deg(x))*cos(deg(x))/2+x/2};
  62. end{axis}
  63. end{tikzpicture}
  64.  
  65. Modified code
  66. begin{tikzpicture}
  67. begin{axis}[
  68. width=0.6textwidth,
  69. view={0}{90},
  70. domain=0:2*pi+0.5,
  71. y domain=0:2*pi+0.5,
  72. xmax=2*pi+1, ymax=2*pi+1,
  73. samples=15,
  74. axis equal image,
  75. axis lines = center,
  76. xtick = {0,3.14,6.28},
  77. ytick = {0,3.14,6.28},
  78. xticklabels = {0,$pi$,$2pi$},
  79. yticklabels = {0,$pi$,$2pi$}
  80. ]
  81. addplot3 [blue, quiver={u={1}, v={sin(deg(x))^2}, scale arrows=0.3, every arrow/.append style={-latex}}] {x};
  82. addplot [thick, red] {2-sin(deg(x))*cos(deg(x))/2+x/2};
  83. end{axis}
  84. end{tikzpicture}
  85.  
  86.  
  87. end{document}
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