Pow

Library

Non_linear

Description

This block realizes $y(i)=u(i)^a$. The input and output port sizes are determined by the compiler according to the connected blocks port sizes.

Dialog Box

Set uâ block parameters
to the power of	1.5

• to the power of:real scalar

Default properties

• always active: no
• direct-feedthrough: yes
• 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: no
• discrete-time state: no
• name of computational function: powblk

Interfacing function

scilab/macros/scicos_blocks/nonlinear/POWBLK_f.sci

Computational function (type 0)

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

c     Scicos block simulator
c     rpar(1) is power
c
      double precision t,xd(*),x(*),z(*),tvec(*),rpar(*),u(*),y(*)
      integer flag,nevprt,nx,nz,ntvec,nrpar,ipar(*)
      integer nipar,nu,ny

c
c     
      if (nrpar.eq.1) then
         do 15 i=1,nu
            if(u(i).lt.0.d0) then
               if (flag.ge.4) return
               flag=-2
               return
            elseif(u(i).eq.0.d0.and.rpar(1).le.0) then
               if (flag.ge.4) return
               flag=-2
               return
            endif
            y(i)=u(i)**rpar(1)
 15      continue
      else
         do 25 i=1,nu
            if(ipar(1).le.0.and.u(i).eq.0.0d0) then
               if (flag.ge.4) return  
               flag=-2
               return
            endif
            y(i)=u(i)**ipar(1)
 25      continue
      endif
      
      end