I have been trying to use Manipulate in the following expression :
Manipulate[
Plot[
Evaluate[
FourierSeries[
Piecewise[{
{0, x < 0}, {1, (0 <= x <= 1)},
{0, 1 < x }
}], x, y
]
], {x, -2, +3}
],
{y, 1, 15}
]
When I press "evaluate notebook" it gives the y=1 plot, but moving the slider creates a blank plot.
Any help would be greatly appreciated.