Constraint

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Description

Solves implicit equations by providing free output and forcing input to be zero. This is an implicit block (beta testing stage).

Dialog Box

Set Constraint block parameters
Set number of constraints	1

• Set number of constraints: indicate the number of constraints

Default properties

• always active: yes
• direct-feedthrough: no
• zero-crossing: no
• mode: no
• number/sizes of inputs: 1 / 1
• number/sizes of outputs: 1 / 1
• number/sizes of activation inputs: 0 /
• number/sizes of activation outputs: 0 /
• continuous-time state: yes
• discrete-time state: no
• name of computational function: constraint

Interfacing function

scilab/macros/scicos_blocks/misc/CONSTRAINT_f.sci

Computational function (type 10001)

      subroutine constraint(flag,nevprt,t,res,xd,x,nx,z,nz,tvec,ntvec,
     &     rpar,nrpar,ipar,nipar,u,nu,y,ny)
c     Copyright INRIA

c     Scicos block simulator
c
      double precision t,xd(*),x(*),z(*),res(*),tvec(*),rpar(*)
      double precision u(*),y(*)
      integer flag,nevprt,nx,nz,ntvec,nrpar,ipar(*)
      integer nipar,nu,ny

c
      common /dbcos/ idb
c     
      if (flag.eq.0) then
         do 12 i=1,nu
            res(i)=xd(i)-u(i)
            res(i+nu)=xd(i)
 12      continue
      elseif(flag.eq.1) then
         do 14 i=1,ny
            y(i)=xd(i+nu)
 14      continue
c      elseif(flag.eq.6.or.flag.eq.7) then
c         do 12 i=1,nu
c 12      continue
      endif
      end