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liming9398金蟲 (正式寫手)
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[求助]
numerical recipes in fortan 代碼的疑惑 已有1人參與
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SUBROUTINE flmoon(n,nph,jd,frac) INTEGER jd,n,nph REAL frac,RAD PARAMETER (RAD=3.14159265/180.) INTEGER i REAL am,as,c,t,t2,xtra c=n+nph/4. t=c/1236.85 t2=t**2 as=359.2242+29.105356*c am=306.0253+385.816918*c+0.010730*t2 jd=2415020+28*n+7*nph xtra=0.75933+1.53058868*c+(1.178e-4-1.55e-7*t)*t2 if(nph.eq.0.or.nph.eq.2)then xtra=xtra+(0.1734-3.93e-4*t)*sin(RAD*as)-0.4068*sin(RAD*am) else if(nph.eq.1.or.nph.eq.3)then xtra=xtra+(0.1721-4.e-4*t)*sin(RAD*as)-0.6280*sin(RAD*am) else pause 'nph is unknown in flmoon' endif if(xtra.ge.0.)then i=int(xtra) else i=int(xtra-1.) endif jd=jd+i frac=xtra-i return END fotran77b標準謝的,為什么要用八位或者九位的常數(shù)給real數(shù)據(jù)RAD,as,am賦值?單精度不是最多七位嗎,多了有意義嗎? |
金蟲 (正式寫手)



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