WSJT-X/lib/pctile.f

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subroutine pctile(x,tmp,nmax,npct,xpct)
real x(nmax),tmp(nmax)
do i=1,nmax
tmp(i)=x(i)
enddo
call sort(nmax,tmp)
j=nint(nmax*0.01*npct)
if(j.lt.1) j=1
xpct=tmp(j)
return
end