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Question: compute integral

Question:compute integral

taras 10
integral undefined float
May 07 2017
2

Can someone answer why i get Float(undefined) while computing integral

Here is my example

NULL

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restart
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with(plots):
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NULL
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alpha0 := .3;

.3

 (1)
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R := .1;

.1

 (2)
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sigma := 636;

636

 (3)
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Kfc := 101;

101

 (4)
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Ksc := 9;

9

 (5)
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E := 2*10^5;

200000

 (6)
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`δth` := 2*10^(-7);

1/5000000

 (7)
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`δc` := 0.8e-1*10^(-3);

0.8000000000e-4

 (8)
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p := 400;

400

 (9)
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`lδz` := 12.1*10^(-3);

0.1210000000e-1

 (10)
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lKz := 20.3*10^(-3);

0.2030000000e-1

 (11)
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eta := 10^(-5);

1/100000

 (12)
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l0 := 0;

0

 (13)
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xi := p/sigma;

100/159

 (14)
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KImax := evalf(p*sqrt(Pi*l));

708.9815404*l^(1/2)

 (15)
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``
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`Nδ` := evalf(E*sigma*(int((-xi^2+1)*(-KImax^2+Kfc^2)/((KImax^2-Ksc^2)*((-R^4+1)*(KImax^2+Ksc^2)+eta*E*sigma)), l = l0 .. `lδz`))/alpha0);

Float(undefined)

 (16)
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``
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NULL
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NULL
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NULL

NULL

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NULL

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Thanks in advance
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