Student Support Forum: 'Legendre expasion rapresentation' topicStudent Support Forum > General > Archives > "Legendre expasion rapresentation"

 Next Comment > Help | Reply To Topic
 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 URL: ,

 Subject (listing for 'Legendre expasion rapresentation') Author Date Posted Legendre expasion rapresentation Andrea 03/30/10 11:49am Re: Legendre expasion rapresentation Nasser M. Ab... 04/01/10 2:40pm
 Next Comment > Help | Reply To Topic