When employing a computational method to solve an Ordinary Differential Equation (ODE), the choice of a smaller time step will result in

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Framing the question in terms of numerical methods for ODEs, the impact of reducing the time step is generally clearer: smaller steps yield a better approximation to the true solution, hence higher accuracy, but require more iterations and function evaluations, increasing computational cost.
Option 1: 'Decreasd accuracy, and decreased coputational cost' is inconsistent with the standard behavior of explicit/implicit time integration schemes, where reducing the step size typically improves accuracy rather than degrades it, and cost does not decrease when you perform more steps.
Option 2: 'Increasd accuracy, and increased coputational cost' aligns with the usual trade-off: better local truncation error per step leads to a more accurate solution, but you perform more steps overall, raising the total work and runtime. The misspellings aside, this captures the correct relationship between step size, accuracy, and cost.
Option 3: 'Increasd accuracy, and reduced coputational cost' suggests that accuracy improves without any extra work or even with less work, which is generally not true for standard time-stepping methods; to gain more accuracy you typically incur more computations, not fewer.
Option 4: 'Decreasd accuracy, and increased coputational cost' implies that taking smaller steps worsens accuracy, which contradicts the fundamental error analysis of most integrators, where smaller steps reduce error but increase cost.
In summary, evaluating the trade-offs, the only option that matches the expected behavior of decreasing the time step is that accuracy increases while computational cost also increases, due to more steps needing to be computed.

BN5206 Week 7 online quiz

When employing a computational method to solve an Ordinary Differential Equation (ODE), the choice of a smaller time step will result in

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