t 1 BesselJ 1, n 2 nfig.if.usp.br/~marchett/fismat1/fourier_identidade-semi... · 2016-03-11 ·...

1
PlotTableSum2 (- 1) n+1 n Sin[n θ], {n, 1, k}, {k, 1, 5}, θ, {θ, - π, π} -3 -2 -1 1 2 3 -3 -2 -1 1 2 3 PlotTableSum2 (- 1) n+1 n Sin[n θ], {n, 1, k}, {k, 1, 5}, θ, {θ, - 2 π,2 π} -6 -4 -2 2 4 6 -6 -4 -2 2 4 6 PlotTableSum2 (- 1) n+1 n Sin[n θ], {n, 1, k}, {k, 10, 15}, θ, {θ, - 2 π,2 π} -6 -4 -2 2 4 6 -6 -4 -2 2 4 6 PlotTableSum2 (- 1) n+1 n Sin[n θ], {n, 1, k}, {k, 30, 35}, θ, {θ, - π, π} -3 -2 -1 1 2 3 -3 -2 -1 1 2 3 PlotTableSum2 (- 1) n+1 n Sin[n θ], {n, 1, k}, {k, 1, 35}, θ, {θ, - π, π} -3 -2 -1 1 2 3 -3 -2 -1 1 2 3 f = 1 -(t / π) 2 1 - t 2 π 2 FourierCoefficient[f, t, n] BesselJ[1, n π] 2n ListPlotTableLogAbs BesselJ[1, Exp[n] π] 2 Exp[n] , {n, 1, 100} 20 40 60 80 100 -140 -120 -100 -80 -60 -40 -20 Plot[Evaluate[{Table[FourierSeries[f, t, n], {n, 5, 9}], f}], {t, - π, π}] -3 -2 -1 1 2 3 0.2 0.4 0.6 0.8 1.0 Plot[Evaluate[Table[FourierSeries[f, t, n], {n, 5, 9}]], {t, - 2 π,2 π}, AspectRatio 1 / 4] -6 -4 -2 2 4 6 0.4 0.6 0.8 1.0 Plot[Evaluate[Table[FourierSeries[f, t, n], {n, 10, 15}]], {t, - 2 π,2 π}, AspectRatio 1 / 3] -6 -4 -2 2 4 6 0.4 0.6 0.8 1.0 Plot[Evaluate[{Table[FourierSeries[f, t, n], {n, 10, 15}], f}], {t, - π, π}, AspectRatio 1 / 2] -3 -2 -1 1 2 3 0.2 0.4 0.6 0.8 1.0 g =(1 - t / π)/ 2 1 2 1 - t π FourierSinCoefficient[g, t, n] 1 n π gg = If[t < 0, (- 1 - t / π)/ 2, (1 - t / π)/ 2] Ift < 0, 1 2 - 1 - t π , 1 2 1 - t π Plot[gg, {t, - π, π}] -3 -2 -1 1 2 3 -0.4 -0.2 0.2 0.4 F[t_, n_] := FourierSinSeries[g, t, n] sigma[t_, n_] := 1 n i=1 n FourierSinSeries[g, t , i] Plot[Evaluate[Table[F[t, n], {n, 10, 15}]], {t, - π, π}] -3 -2 -1 1 2 3 -0.4 -0.2 0.2 0.4 Plot[Evaluate[Table[F[t, n], {n, 25, 30}]], {t, - π, π}] -3 -2 -1 1 2 3 -0.4 -0.2 0.2 0.4 Plot[Evaluate[Table[sigma[t, n], {n, 10, 15}]], {t, - π, π}] -3 -2 -1 1 2 3 -0.4 -0.2 0.2 0.4 Plot[Evaluate[Table[sigma[t, n], {n, 15, 30}]], {t, - π, π}] -3 -2 -1 1 2 3 -0.4 -0.2 0.2 0.4 Plot[Evaluate[{gg, F[t, 30], sigma[t, 30]}], {t, - π, π}, PlotStyle {Thick, Thick, Thick}] -3 -2 -1 1 2 3 -0.4 -0.2 0.2 0.4 Di[n_] := 1 2 π Sin[(n + 1 / 2) x] Sin[x / 2] Plot[Di[10], {x, 0, 2 π}, PlotRange All] 1 2 3 4 5 6 1 2 3 Plot[Di[20], {x, 0, 2 π}, PlotRange All] 1 2 3 4 5 6 2 4 6 Plotx Di[10], x 1 2 π Sin[x / 2] , {x, 0, π}, PlotRange All 0.5 1.0 1.5 2.0 2.5 3.0 -0.4 -0.2 0.2 0.4

Transcript of t 1 BesselJ 1, n 2 nfig.if.usp.br/~marchett/fismat1/fourier_identidade-semi... · 2016-03-11 ·...

Page 1: t 1 BesselJ 1, n 2 nfig.if.usp.br/~marchett/fismat1/fourier_identidade-semi... · 2016-03-11 · Plot Table Sum 2 (-1)n+1 n Sin[nθ], {n, 1, k} , {k, 1, 5} , θ , {θ, -π,π} -3

PlotTableSum2(-1)n+1

nSin[n θ], {n, 1, k}, {k, 1, 5}, θ, {θ, -π, π}

-3 -2 -1 1 2 3

-3

-2

-1

1

2

3

PlotTableSum2(-1)n+1

nSin[n θ], {n, 1, k}, {k, 1, 5}, θ, {θ, -2 π, 2 π}

-6 -4 -2 2 4 6

-6

-4

-2

2

4

6

PlotTableSum2(-1)n+1

nSin[n θ], {n, 1, k}, {k, 10, 15}, θ, {θ, -2 π, 2 π}

-6 -4 -2 2 4 6

-6

-4

-2

2

4

6

PlotTableSum2(-1)n+1

nSin[n θ], {n, 1, k}, {k, 30, 35}, θ, {θ, -π, π}

-3 -2 -1 1 2 3

-3

-2

-1

1

2

3

PlotTableSum2(-1)n+1

nSin[n θ], {n, 1, k}, {k, 1, 35}, θ, {θ, -π, π}

-3 -2 -1 1 2 3

-3

-2

-1

1

2

3

f = 1 - (t/π)2

1 -t2

π2

FourierCoefficient[f, t, n]

BesselJ[1, n π]

2 n

ListPlotTableLogAbsBesselJ[1, Exp[n] π]

2 Exp[n], {n, 1, 100}

20 40 60 80 100

-140

-120

-100

-80

-60

-40

-20

Plot[Evaluate[{Table[FourierSeries[f, t, n], {n, 5, 9}], f}], {t, -π, π}]

-3 -2 -1 1 2 3

0.2

0.4

0.6

0.8

1.0

Plot[Evaluate[Table[FourierSeries[f, t, n], {n, 5, 9}]], {t, -2 π, 2 π}, AspectRatio → 1/4]

-6 -4 -2 2 4 6

0.4

0.6

0.8

1.0

Plot[Evaluate[Table[FourierSeries[f, t, n], {n, 10, 15}]], {t, -2 π, 2 π}, AspectRatio → 1/3]

-6 -4 -2 2 4 6

0.4

0.6

0.8

1.0

Plot[Evaluate[{Table[FourierSeries[f, t, n], {n, 10, 15}], f}], {t, -π, π}, AspectRatio → 1/2]

-3 -2 -1 1 2 3

0.2

0.4

0.6

0.8

1.0

g = (1 - t/π)/2

1

21 -

t

π

FourierSinCoefficient[g, t, n]

1

n π

gg = If[t < 0, (-1 - t/π)/2, (1 - t/π)/2]

Ift < 0,1

2-1 -

t

π,

1

21 -

t

π

Plot[gg, {t, -π, π}]

-3 -2 -1 1 2 3

-0.4

-0.2

0.2

0.4

F[t_, n_] := FourierSinSeries[g, t, n]

sigma[t_, n_] :=1

n

i=1

n

FourierSinSeries[g, t , i]

Plot[Evaluate[Table[F[t, n], {n, 10, 15}]], {t, -π, π}]

-3 -2 -1 1 2 3

-0.4

-0.2

0.2

0.4

Plot[Evaluate[Table[F[t, n], {n, 25, 30}]], {t, -π, π}]

-3 -2 -1 1 2 3

-0.4

-0.2

0.2

0.4

Plot[Evaluate[Table[sigma[t, n], {n, 10, 15}]], {t, -π, π}]

-3 -2 -1 1 2 3

-0.4

-0.2

0.2

0.4

Plot[Evaluate[Table[sigma[t, n], {n, 15, 30}]], {t, -π, π}]

-3 -2 -1 1 2 3

-0.4

-0.2

0.2

0.4

Plot[Evaluate[{gg, F[t, 30], sigma[t, 30]}], {t, -π, π}, PlotStyle → {Thick, Thick, Thick}]

-3 -2 -1 1 2 3

-0.4

-0.2

0.2

0.4

Di[n_] :=1

2 π

Sin[(n + 1/2) x]

Sin[x/2]

Plot[Di[10], {x, 0, 2 π}, PlotRange → All]

1 2 3 4 5 6

1

2

3

Plot[Di[20], {x, 0, 2 π}, PlotRange → All]

1 2 3 4 5 6

2

4

6

Plotx Di[10], x1

2 π Sin[x/2], {x, 0, π}, PlotRange → All

0.5 1.0 1.5 2.0 2.5 3.0

-0.4

-0.2

0.2

0.4