Use lambdify in sample_iter instead of subs.
Use lambdify in sample_iter instead of subs.

This results in a 10x speed increase and may aid future numpization

sahilshekhawat/sympy,jbbskinny/sympy,jaimahajan1997/sympy,sahilshekhawat/sympy,farhaanbukhsh/sympy,postvakje/sympy,Davidjohnwilson/sympy,lindsayad/sympy,Davidjohnwilson/sympy,Shaswat27/sympy,rahuldan/sympy,VaibhavAgarwalVA/sympy,mafiya69/sympy,MechCoder/sympy,Shaswat27/sympy,sahmed95/sympy,drufat/sympy,atreyv/sympy,iamutkarshtiwari/sympy,mcdaniel67/sympy,MridulS/sympy,ahhda/sympy,beni55/sympy,jamesblunt/sympy,Gadal/sympy,kaichogami/sympy,drufat/sympy,AkademieOlympia/sympy,wanglongqi/sympy,sampadsaha5/sympy,iamutkarshtiwari/sympy,Arafatk/sympy,cccfran/sympy,kmacinnis/sympy,atsao72/sympy,postvakje/sympy,skidzo/sympy,sahilshekhawat/sympy,aktech/sympy,jamesblunt/sympy,jbbskinny/sympy,shipci/sympy,emon10005/sympy,oliverlee/sympy,Sumith1896/sympy,sunny94/temp,drufat/sympy,vipulroxx/sympy,cswiercz/sympy,pandeyadarsh/sympy,dqnykamp/sympy,souravsingh/sympy,Davidjohnwilson/sympy,wanglongqi/sympy,yashsharan/sympy,jerli/sympy,yashsharan/sympy,moble/sympy,postvakje/sympy,asm666/sympy,saurabhjn76/sympy,Mitchkoens/sympy,AkademieOlympia/sympy,toolforger/sympy,moble/sympy,rahuldan/sympy,ahhda/sympy,meghana1995/sympy,mafiya69/sympy,Curious72/sympy,MridulS/sympy,sunny94/temp,asm666/sympy,madan96/sympy,pandeyadarsh/sympy,asm666/sympy,shipci/sympy,cccfran/sympy,yukoba/sympy,kmacinnis/sympy,kumarkrishna/sympy,kaushik94/sympy,VaibhavAgarwalVA/sympy,kaichogami/sympy,hrashk/sympy,Mitchkoens/sympy,toolforger/sympy,mafiya69/sympy,AunShiLord/sympy,kaushik94/sympy,sahmed95/sympy,aktech/sympy,Curious72/sympy,Vishluck/sympy,Designist/sympy,shikil/sympy,sampadsaha5/sympy,Titan-C/sympy,diofant/diofant,madan96/sympy,srjoglekar246/sympy,meghana1995/sympy,ChristinaZografou/sympy,flacjacket/sympy,oliverlee/sympy,MridulS/sympy,hargup/sympy,abhiii5459/sympy,skirpichev/omg,yashsharan/sympy,debugger22/sympy,pbrady/sympy,Titan-C/sympy,cccfran/sympy,souravsingh/sympy,debugger22/sympy,AunShiLord/sympy,lidavidm/sympy,madan96/sympy,abhiii5459/sympy,skidzo/sympy,ga7g08/sympy,cswiercz/sympy,Designist/sympy,hrashk/sympy,lindsayad/sympy,shikil/sympy,jerli/sympy,kmacinnis/sympy,garvitr/sympy,pbrady/sympy,Arafatk/sympy,wyom/sympy,maniteja123/sympy,emon10005/sympy,ahhda/sympy,shikil/sympy,farhaanbukhsh/sympy,sunny94/temp,yukoba/sympy,VaibhavAgarwalVA/sympy,chaffra/sympy,oliverlee/sympy,moble/sympy,Shaswat27/sympy,grevutiu-gabriel/sympy,sahmed95/sympy,saurabhjn76/sympy,liangjiaxing/sympy,beni55/sympy,wanglongqi/sympy,jerli/sympy,skidzo/sympy,vipulroxx/sympy,Arafatk/sympy,lidavidm/sympy,bukzor/sympy,kevalds51/sympy,Sumith1896/sympy,pbrady/sympy,atsao72/sympy,cswiercz/sympy,lidavidm/sympy,MechCoder/sympy,Designist/sympy,jamesblunt/sympy,ga7g08/sympy,farhaanbukhsh/sympy,jbbskinny/sympy,Gadal/sympy,Mitchkoens/sympy,kaichogami/sympy,rahuldan/sympy,chaffra/sympy,amitjamadagni/sympy,kevalds51/sympy,Vishluck/sympy,abloomston/sympy,ChristinaZografou/sympy,emon10005/sympy,atsao72/sympy,ga7g08/sympy,ChristinaZografou/sympy,debugger22/sympy,maniteja123/sympy,iamutkarshtiwari/sympy,garvitr/sympy,jaimahajan1997/sympy,lindsayad/sympy,hrashk/sympy,AkademieOlympia/sympy,atreyv/sympy,dqnykamp/sympy,Titan-C/sympy,yukoba/sympy,meghana1995/sympy,Curious72/sympy,kumarkrishna/sympy,MechCoder/sympy,aktech/sympy,kaushik94/sympy,abhiii5459/sympy,liangjiaxing/sympy,saurabhjn76/sympy,sampadsaha5/sympy,liangjiaxing/sympy,souravsingh/sympy,abloomston/sympy,amitjamadagni/sympy,beni55/sympy,wyom/sympy,Vishluck/sympy,chaffra/sympy,mcdaniel67/sympy,Gadal/sympy,hargup/sympy,grevutiu-gabriel/sympy,pandeyadarsh/sympy,jaimahajan1997/sympy,wyom/sympy,kumarkrishna/sympy,bukzor/sympy,garvitr/sympy,toolforger/sympy,abloomston/sympy,AunShiLord/sympy,shipci/sympy,bukzor/sympy,vipulroxx/sympy,maniteja123/sympy,Sumith1896/sympy,atreyv/sympy,dqnykamp/sympy,mcdaniel67/sympy,grevutiu-gabriel/sympy,hargup/sympy,kevalds51/sympy