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matlab数值积分工具箱自己加入到工具箱就能够使用了

 Numerical Integration Toolbox

 MATLAB Toolbox for 1-D, 2-D, and n-D Numerical Integration

 The original 1-D routines were obtained from NETLIB and were 
 written by
          Howard Wilson
          Department of Engineering Mechanics
          University of Alabama
          Box 870278
          Tuscaloosa, Alabama 35487-0278
          Phone [phone]
          Email address: HWILSON @ UA1VM.UA.EDU
 
 The rest of the routines were written by
          Bryce Gardner
          Ray W. Herrick Laboratories
          Purdue University
          West Lafayette, IN 47906
          Phone: [phone]
          Fax:  [phone]
          Email:  [e-mail]

 These are the general purpose integration routines: 

        quadg.m      -- High accuracy replacement for QUAD and QUAD8 (1-D)
        quad2dg.m    -- 2-D integration over a rectangular region
        quad2dggen.m -- 2-D integration over a general region
        quadndg.m    -- n-D integration over a n-D hyper-rectangular region

 Use the other routines if you want a specific integration quadrature or
 specific order of integration quadrature.  It is faster if you know that
 you need a 10th order integration quadrature to use it directly.  If you
 use the above routines, the integration will be done with quadratures of 
 several different orders until the results converge.