(help)matlab最佳化powell method

[jaosn1005]

请问如何用此法解下面这最佳化问题:
两圆锥中间夹著一圆柱,圆锥高L2圆柱高L1,圆柱和圆锥直径皆为D

求当容积1M^3时L1,L2,D分别是多少

[jaosn1005]

原題目如下,望高手能指點
The symmetrical pod is to be fabricated from three sections of metal sheet material and will consist of a cylindrical center with conical ends.
The three pieces, once fabricated, will be welded together. The design specifications for this pod call for a volume of 1.0 m^3. It is desired to minimize the amount of material used in the design for reasons of weight and cost.
What dimensions L1,L2 and D would you recommend for this design?