DOC: Add an example plot to iirfilter docstring, add notes about frequency transformations
DOC: Add an example plot to iirfilter docstring,
add notes about frequency transformations

andim/scipy,surhudm/scipy,ilayn/scipy,rmcgibbo/scipy,cpaulik/scipy,jsilter/scipy,mortada/scipy,gfyoung/scipy,richardotis/scipy,anntzer/scipy,mortonjt/scipy,mortada/scipy,zaxliu/scipy,gertingold/scipy,matthew-brett/scipy,Srisai85/scipy,Kamp9/scipy,futurulus/scipy,anielsen001/scipy,nvoron23/scipy,aarchiba/scipy,mtrbean/scipy,andim/scipy,ortylp/scipy,zaxliu/scipy,argriffing/scipy,scipy/scipy,e-q/scipy,trankmichael/scipy,dch312/scipy,futurulus/scipy,zxsted/scipy,grlee77/scipy,ales-erjavec/scipy,pschella/scipy,larsmans/scipy,apbard/scipy,bkendzior/scipy,sonnyhu/scipy,person142/scipy,zxsted/scipy,aman-iitj/scipy,pbrod/scipy,kleskjr/scipy,ortylp/scipy,perimosocordiae/scipy,Srisai85/scipy,kalvdans/scipy,ndchorley/scipy,sauliusl/scipy,pizzathief/scipy,ChanderG/scipy,felipebetancur/scipy,haudren/scipy,pyramania/scipy,njwilson23/scipy,vberaudi/scipy,sriki18/scipy,behzadnouri/scipy,larsmans/scipy,kalvdans/scipy,sauliusl/scipy,gfyoung/scipy,giorgiop/scipy,dominicelse/scipy,trankmichael/scipy,vanpact/scipy,hainm/scipy,WarrenWeckesser/scipy,vhaasteren/scipy,Dapid/scipy,gdooper/scipy,efiring/scipy,woodscn/scipy,WillieMaddox/scipy,scipy/scipy,mhogg/scipy,cpaulik/scipy,jsilter/scipy,arokem/scipy,Newman101/scipy,newemailjdm/scipy,sonnyhu/scipy,Dapid/scipy,nvoron23/scipy,perimosocordiae/scipy,sriki18/scipy,pbrod/scipy,andim/scipy,minhlongdo/scipy,vberaudi/scipy,mtrbean/scipy,Dapid/scipy,person142/scipy,raoulbq/scipy,nvoron23/scipy,mortada/scipy,woodscn/scipy,raoulbq/scipy,Eric89GXL/scipy,pnedunuri/scipy,FRidh/scipy,aarchiba/scipy,dch312/scipy,woodscn/scipy,mdhaber/scipy,bkendzior/scipy,trankmichael/scipy,FRidh/scipy,ilayn/scipy,piyush0609/scipy,vigna/scipy,giorgiop/scipy,cpaulik/scipy,maciejkula/scipy,nonhermitian/scipy,zxsted/scipy,jsilter/scipy,FRidh/scipy,Kamp9/scipy,gdooper/scipy,piyush0609/scipy,larsmans/scipy,mikebenfield/scipy,pnedunuri/scipy,dominicelse/scipy,niknow/scipy,kleskjr/scipy,Gillu13/scipy,haudren/scipy,Dapid/scipy,raoulbq/scipy,argriffing/scipy,sonnyhu/scipy,nvoron23/scipy,witcxc/scipy,matthew-brett/scipy,andyfaff/scipy,jamestwebber/scipy,fredrikw/scipy,mdhaber/scipy,josephcslater/scipy,dominicelse/scipy,aman-iitj/scipy,ilayn/scipy,ales-erjavec/scipy,njwilson23/scipy,rgommers/scipy,fredrikw/scipy,cpaulik/scipy,mingwpy/scipy,zerothi/scipy,zerothi/scipy,vhaasteren/scipy,scipy/scipy,gef756/scipy,befelix/scipy,Gillu13/scipy,andyfaff/scipy,sonnyhu/scipy,pyramania/scipy,Eric89GXL/scipy,anntzer/scipy,Gillu13/scipy,ChanderG/scipy,felipebetancur/scipy,hainm/scipy,tylerjereddy/scipy,vanpact/scipy,pbrod/scipy,WillieMaddox/scipy,mingwpy/scipy,mtrbean/scipy,dch312/scipy,vanpact/scipy,sauliusl/scipy,pyramania/scipy,lhilt/scipy,ChanderG/scipy,niknow/scipy,pizzathief/scipy,jonycgn/scipy,Stefan-Endres/scipy,ndchorley/scipy,ogrisel/scipy,aman-iitj/scipy,aman-iitj/scipy,person142/scipy,jakevdp/scipy,sonnyhu/scipy,WarrenWeckesser/scipy,vigna/scipy,ogrisel/scipy,jor-/scipy,niknow/scipy,grlee77/scipy,woodscn/scipy,grlee77/scipy,sriki18/scipy,vigna/scipy,vhaasteren/scipy,lhilt/scipy,sonnyhu/scipy,cpaulik/scipy,behzadnouri/scipy,vberaudi/scipy,raoulbq/scipy,WarrenWeckesser/scipy,ilayn/scipy,nonhermitian/scipy,felipebetancur/scipy,jseabold/scipy,tylerjereddy/scipy,maniteja123/scipy,pbrod/scipy,aman-iitj/scipy,andim/scipy,lhilt/scipy,surhudm/scipy,fredrikw/scipy,scipy/scipy,sriki18/scipy,vberaudi/scipy,perimosocordiae/scipy,futurulus/scipy,chatcannon/scipy,Shaswat27/scipy,mikebenfield/scipy,ndchorley/scipy,josephcslater/scipy,surhudm/scipy,rgommers/scipy,efiring/scipy,surhudm/scipy,jonycgn/scipy,andim/scipy,zerothi/scipy,lhilt/scipy,endolith/scipy,mikebenfield/scipy,vanpact/scipy,ChanderG/scipy,gdooper/scipy,Kamp9/scipy,pschella/scipy,kalvdans/scipy,jjhelmus/scipy,pbrod/scipy,sauliusl/scipy,jseabold/scipy,efiring/scipy,jor-/scipy,ogrisel/scipy,petebachant/scipy,mgaitan/scipy,surhudm/scipy,mhogg/scipy,ales-erjavec/scipy,woodscn/scipy,aarchiba/scipy,endolith/scipy,ilayn/scipy,Shaswat27/scipy,maciejkula/scipy,gdooper/scipy,anielsen001/scipy,e-q/scipy,jsilter/scipy,woodscn/scipy,Gillu13/scipy,jsilter/scipy,pyramania/scipy,jonycgn/scipy,Stefan-Endres/scipy,jonycgn/scipy,chatcannon/scipy,felipebetancur/scipy,anielsen001/scipy,trankmichael/scipy,Gillu13/scipy,matthewalbani/scipy,befelix/scipy,fredrikw/scipy,pschella/scipy,pnedunuri/scipy,gfyoung/scipy,piyush0609/scipy,ndchorley/scipy,rmcgibbo/scipy,pschella/scipy,lukauskas/scipy,zerothi/scipy,perimosocordiae/scipy,fernand/scipy,newemailjdm/scipy,minhlongdo/scipy,apbard/scipy,jamestwebber/scipy,ChanderG/scipy,jonycgn/scipy,vhaasteren/scipy,rgommers/scipy,mgaitan/scipy,Shaswat27/scipy,maciejkula/scipy,Stefan-Endres/scipy,sauliusl/scipy,niknow/scipy,aeklant/scipy,Stefan-Endres/scipy,haudren/scipy,newemailjdm/scipy,gfyoung/scipy,WarrenWeckesser/scipy,nmayorov/scipy,mingwpy/scipy,behzadnouri/scipy,aeklant/scipy,newemailjdm/scipy,vhaasteren/scipy,jseabold/scipy,felipebetancur/scipy,jakevdp/scipy,minhlongdo/scipy,rmcgibbo/scipy,ales-erjavec/scipy,WillieMaddox/scipy,bkendzior/scipy,trankmichael/scipy,jjhelmus/scipy,anntzer/scipy,WarrenWeckesser/scipy,mgaitan/scipy,mdhaber/scipy,argriffing/scipy,niknow/scipy,fernand/scipy,nonhermitian/scipy,cpaulik/scipy,piyush0609/scipy,vanpact/scipy,newemailjdm/scipy,matthew-brett/scipy,vigna/scipy,mortonjt/scipy,kalvdans/scipy,futurulus/scipy,pnedunuri/scipy,futurulus/scipy,mortonjt/scipy,chatcannon/scipy,njwilson23/scipy,zerothi/scipy,person142/scipy,apbard/scipy,maniteja123/scipy,jor-/scipy,petebachant/scipy,fernand/scipy,Kamp9/scipy,Eric89GXL/scipy,lukauskas/scipy,befelix/scipy,haudren/scipy,efiring/scipy,gef756/scipy,mtrbean/scipy,larsmans/scipy,ogrisel/scipy,giorgiop/scipy,endolith/scipy,matthewalbani/scipy,Newman101/scipy,perimosocordiae/scipy,mingwpy/scipy,jakevdp/scipy,sriki18/scipy,hainm/scipy,fernand/scipy,mtrbean/scipy,aman-iitj/scipy,Gillu13/scipy,ortylp/scipy,anielsen001/scipy,mtrbean/scipy,pizzathief/scipy,FRidh/scipy,pizzathief/scipy,njwilson23/scipy,e-q/scipy,pyramania/scipy,mikebenfield/scipy,ChanderG/scipy,jor-/scipy,petebachant/scipy,bkendzior/scipy,lukauskas/scipy,mhogg/scipy,piyush0609/scipy,josephcslater/scipy,zaxliu/scipy,richardotis/scipy,anntzer/scipy,argriffing/scipy,jamestwebber/scipy,mortonjt/scipy,niknow/scipy,mortonjt/scipy,kleskjr/scipy,mgaitan/scipy,nvoron23/scipy,minhlongdo/scipy,vberaudi/scipy,pschella/scipy,Stefan-Endres/scipy,gertingold/scipy,andim/scipy,gfyoung/scipy,piyush0609/scipy,Srisai85/scipy,maniteja123/scipy,mdhaber/scipy,e-q/scipy,felipebetancur/scipy,tylerjereddy/scipy,e-q/scipy,arokem/scipy,jor-/scipy,dominicelse/scipy,Srisai85/scipy,ortylp/scipy,dominicelse/scipy,Newman101/scipy,Stefan-Endres/scipy,ales-erjavec/scipy,jjhelmus/scipy,gertingold/scipy,Newman101/scipy,aeklant/scipy,rmcgibbo/scipy,mgaitan/scipy,grlee77/scipy,person142/scipy,mingwpy/scipy,WarrenWeckesser/scipy,dch312/scipy,Dapid/scipy,chatcannon/scipy,raoulbq/scipy,pnedunuri/scipy,tylerjereddy/scipy,gertingold/scipy,zaxliu/scipy,lukauskas/scipy,tylerjereddy/scipy,WillieMaddox/scipy,WillieMaddox/scipy,matthew-brett/scipy,aarchiba/scipy,mingwpy/scipy,josephcslater/scipy,minhlongdo/scipy,hainm/scipy,maniteja123/scipy,maciejkula/scipy,witcxc/scipy,ortylp/scipy,Eric89GXL/scipy,arokem/scipy,fredrikw/scipy,Shaswat27/scipy,rgommers/scipy,giorgiop/scipy,nmayorov/scipy,zxsted/scipy,zxsted/scipy,petebachant/scipy,anntzer/scipy,matthewalbani/scipy,aeklant/scipy,bkendzior/scipy,behzadnouri/scipy,argriffing/scipy,lhilt/scipy,grlee77/scipy,Shaswat27/scipy,josephcslater/scipy,nmayorov/scipy,futurulus/scipy,zaxliu/scipy,ales-erjavec/scipy,matthewalbani/scipy,zerothi/scipy,nonhermitian/scipy,njwilson23/scipy,kleskjr/scipy,petebachant/scipy,endolith/scipy,ilayn/scipy,mikebenfield/scipy,Newman101/scipy,richardotis/scipy,mdhaber/scipy,haudren/scipy,petebachant/scipy,gdooper/scipy,sauliusl/scipy,maniteja123/scipy,chatcannon/scipy,fredrikw/scipy,witcxc/scipy,jjhelmus/scipy,rgommers/scipy,behzadnouri/scipy,endolith/scipy,larsmans/scipy,witcxc/scipy,nmayorov/scipy,WillieMaddox/scipy,ogrisel/scipy,jakevdp/scipy,efiring/scipy,hainm/scipy,giorgiop/scipy,aeklant/scipy,anielsen001/scipy,Eric89GXL/scipy,Newman101/scipy,arokem/scipy,pizzathief/scipy,befelix/scipy,giorgiop/scipy,FRidh/scipy,maciejkula/scipy,mgaitan/scipy,mdhaber/scipy,kalvdans/scipy,mortada/scipy,scipy/scipy,mhogg/scipy,larsmans/scipy,andyfaff/scipy,efiring/scipy,zxsted/scipy,ndchorley/scipy,gef756/scipy,pbrod/scipy,matthew-brett/scipy,befelix/scipy,lukauskas/scipy,Kamp9/scipy,ortylp/scipy,endolith/scipy,pnedunuri/scipy,Kamp9/scipy,ndchorley/scipy,apbard/scipy,richardotis/scipy,jonycgn/scipy,vanpact/scipy,andyfaff/scipy,nmayorov/scipy,jamestwebber/scipy,jseabold/scipy,nvoron23/scipy,Dapid/scipy,newemailjdm/scipy,apbard/scipy,andyfaff/scipy,mortada/scipy,fernand/scipy,trankmichael/scipy,vhaasteren/scipy,gef756/scipy,anntzer/scipy,arokem/scipy,fernand/scipy,rmcgibbo/scipy,zaxliu/scipy,Srisai85/scipy,kleskjr/scipy,lukauskas/scipy,behzadnouri/scipy,mhogg/scipy,minhlongdo/scipy,jjhelmus/scipy,rmcgibbo/scipy,matthewalbani/scipy,mortada/scipy,mhogg/scipy,gef756/scipy,anielsen001/scipy,raoulbq/scipy,perimosocordiae/scipy,maniteja123/scipy,Shaswat27/scipy,Eric89GXL/scipy,Srisai85/scipy,mortonjt/scipy,richardotis/scipy,richardotis/scipy,vigna/scipy,hainm/scipy,gertingold/scipy,kleskjr/scipy,surhudm/scipy,chatcannon/scipy,vberaudi/scipy,nonhermitian/scipy,haudren/scipy,aarchiba/scipy,dch312/scipy,andyfaff/scipy,witcxc/scipy,njwilson23/scipy,FRidh/scipy,jamestwebber/scipy,jseabold/scipy,gef756/scipy,argriffing/scipy,jakevdp/scipy,jseabold/scipy,scipy/scipy,sriki18/scipy