Source de ode08.tex
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\psset{xunit=.7}
    \begin{pspicture}(0,-4)(26,6)\psgrid
      \psplot[plotpoints=200, linewidth=4\pslinewidth, linecolor=gray]{0}{26}{2.71828182846 x -8 div exp
        x 127 sqrt 8 div mul 180 mul 3.1415926535 div dup cos 5 mul exch sin 127 sqrt div 5
        mul add mul}
      \psplotequadiff[linecolor=red, plotpoints=500]{0}{26}{5 0}
      {dup 3 1 roll -4 div exch 2 mul sub}
      \psplotequadiff[linecolor=blue, method=rk4, plotpoints=50]{0}{26}{5 0}
      {dup 3 1 roll -4 div exch 2 mul sub}
    \end{pspicture}

 

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