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robert5722
robert5722

Reputation: 11

I Do Not Know Why One of These Two Plots Requires the /. Replacement Operator

Why does the first Plot require the '/.' replacement operator, but the second Plot does not? Both use InterpolatingFunctions.

In the first block of code, 'sol' is an InterpolatingFunction. In the second block of code, iFun is an InterpolatingFunction.

I'm still new to Mathematica.

ode1 = {y''[x] + Sin[y[x]] == 0, y[0] == 2, y'[0] == 1};
sol = NDSolve[ode1, y, {x, -10, 10}]
Plot[y[x] /. sol, {x, -10, 10}]

points = {{0, 0}, {1, 1} {2, 3}, {3, 4}, {4, 3}, {5, 0}};
ifun = Interpolation[points]
Plot[ifun[x], {x, 0, 5}]

I've tried various syntactic choices without success. I believe I am missing some key conceptual piece of information about how these features work.

Thank you.

Upvotes: 0

Views: 28

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