Description Usage Arguments Details Value Author(s)
A kernel of order 4.
1 | kernel4(x)
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x |
A real number. |
A kernel L is a kernel of order 4 if it integrates 1, the integrals of u^j L(u) are 0 for 1 <= j < 4 (j integer) and the integral of u^4 L(u) is different from 0.
0 if abs(x) > 1 and ( 15/32 ) * ( 1 - x^2 ) * ( 3 - 7 * x^2 ) otherwise.
Alejandra Martinez, Matias Salibian-Barrera
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