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13-May-2025 18:51:24

tough_ode_test():
  MATLAB/Octave version 9.11.0.2358333 (R2021b) Update 7
  Solve tough_ode().

  parameters:
    t0    = 0
    y0    = (1,1,1,1)
    tstop = 3

tough_ode23():
  Solve tough_ode() using ode23().
[Warning: Failure at t=2.002174e-01.  Unable to meet integration tolerances
without reducing the step size below the smallest value allowed (4.440892e-16)
at time t.] 
[> In ode23 (line 290)
In tough_ode23 (line 28)
In tough_ode_test (line 35)
In run (line 91)] 

  Number of variable steps = 71
  Graphics saved in "tough_ode23_y1.png"
  Graphics saved in "tough_ode23_y2.png"
  Graphics saved in "tough_ode23_y3.png"
  Graphics saved in "tough_ode23_y4.png"

tough_ode45():
  Test tough_ode() using ode45().

  Number of variable steps = 165
[Warning: Imaginary parts of complex X and/or Y arguments ignored.] 
[> In tough_ode45 (line 41)
In tough_ode_test (line 37)
In run (line 91)] 
  Graphics saved in "tough_ode45_y1.png"
[Warning: Imaginary parts of complex X and/or Y arguments ignored.] 
[> In tough_ode45 (line 56)
In tough_ode_test (line 37)
In run (line 91)] 
  Graphics saved in "tough_ode45_y2.png"
[Warning: Imaginary parts of complex X and/or Y arguments ignored.] 
[> In tough_ode45 (line 71)
In tough_ode_test (line 37)
In run (line 91)] 
  Graphics saved in "tough_ode45_y3.png"
[Warning: Imaginary parts of complex X and/or Y arguments ignored.] 
[> In tough_ode45 (line 86)
In tough_ode_test (line 37)
In run (line 91)] 
  Graphics saved in "tough_ode45_y4.png"

tough_midpoint():
  Solve tough_ode() using midpoint().

  Number of equal steps = 200000
  Graphics saved in "tough_midpoint_y1.png"
  Graphics saved in "tough_midpoint_y2.png"
  Graphics saved in "tough_midpoint_y3.png"
  Graphics saved in "tough_midpoint_y4.png"

tough_ode_test():
  Normal end of execution.

13-May-2025 18:52:49