RosettaCodeData/Task/Numerical-integration/J/numerical-integration-2.j

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Ir=: rectangle integrate
It=: trapezium integrate
Is=: simpson integrate
^&3 Ir 0 1 100
0.249987
^&3 It 0 1 100
0.250025
^&3 Is 0 1 100
0.25
% Ir 1 100 1000
4.60476
% It 1 100 1000
4.60599
% Is 1 100 1000
4.60517
] Ir 0 5000 5e6
1.25e7
] It 0 5000 5e6
1.25e7
] Is 0 5000 5e6
1.25e7
] Ir 0 6000 6e6
1.8e7
] It 0 6000 6e6
1.8e7
] Is 0 6000 6e6
1.8e7