| Author |
Comment/Response |
Andrea
|
 03/30/10 11:49am
I'm doing some exercises on Legendre polynomial expansion to approximate a step function (in this simple case)
The algebra is working.
This is the formula for calculating the function that I need
Sum[(2 n + 1)/
2 Integrate[
If[x > 0.9, 10, 0] LegendreP[n, x], {x, -1, 1}] LegendreP[n,
x], {n, 0, 30}]
I'd like to represent the result which is a polynomial, a function in x.
If I use plot in front of this expression
Plot[Sum[(2 n + 1)/
2 Integrate[
If[x > 0.9, 10, 0] LegendreP[n, x], {x, -1, 1}] LegendreP[n,
x], {n, 0, 30}], {x, -1, 1}]
I get an error.
Where is my mistake?? Thank you
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