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Nov 15th, 2018
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  1. (*First ODE gives y as output*)
  2.  
  3. s = NDSolve[{y'[x] == 0, y[0] == 1}, y, {x, 0, 1}]
  4. yy[x_] := Evaluate[y[x] /. s]
  5. Plot[yy[x], {x, 0, 2}, PlotRange -> All]
  6.  
  7. (*Second ODE must use y as input*)
  8.  
  9. s2 = NDSolve[{z'[x] == yy[x], z[0] == 0}, z, {x, 0, 1}]
  10. zz[x_] := Evaluate[z[x] /. s2]
  11. Plot[zz[x], {x, 0, 2}, PlotRange -> All]
  12.  
  13. s = NDSolve[{y'[x] == 0, y[0] == 1}, y, {x, 0, 1}]
  14. yy[x_] := Evaluate[y[x] /. s] // First
  15. Plot[yy[x], {x, 0, 2}, PlotRange -> All]
  16.  
  17. s2 = NDSolve[{z'[x] == yy[x], z[0] == 0}, z, {x, 0, 1}]
  18. zz[x_] := Evaluate[z[x] /. s2]
  19. Plot[zz[x], {x, 0, 2}, PlotRange -> All]
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