| [613] | 1 | YSESLOG ;SLC/DCM-UTILITY ROUTINE TO CALCULATE LOGARITHMS TO BASE e OR BASE 10 ; 10/18/88 16:54 ;
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| 2 | ;;5.01;MENTAL HEALTH;;Dec 30, 1994
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| 3 | ;DECISION EXPERT SYSTEM (VERSION 1.0) FOR MENTAL HEALTH PACKAGE - DWIGHT MCDANIEL / REGION 5 ISC, SLC
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| 4 | ;PASS NUMBER TO A5AESLOG IN VARIABLE ESLN; LOGARIGHM OF NUMBER RETURNED AS ESY
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| 5 | ;DECIMAL ACCURACY IS 8 DECIMAL DIGITS
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| 6 | CALC S ESLU=ESL1-.707106781187/(ESL1+.70710681187),ESLV=ESLU*ESLU
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| 7 | S ESLU=.434259751292*ESLV+.576584342056*ESLV+.961800762286*ESLV+2.885390072738*ESLU
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| 8 | Q
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| 9 | EXIT S ESLS=0 S:ESY<0 ESLS=1,ESY=-ESY S ESY=$E(ESY+.000000005,1,ESY["."+8),ESY=$E("-",ESLS)_ESY D CONV:ESE S:$E(ESY,$L(ESY))["0" ESY=$E(ESY,1,$L(ESY)-1)
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| 10 | EXIT1 K ESLI,ESL1,ESLS,ESLU,ESLV,ESLZ Q
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| 11 | CONV I ESY>10 F ESLI=0:1 Q:ESY<10 S ESY=ESY/10
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| 12 | I ESY<1 F ESLI=0:-1 Q:ESY>1 S ESY=ESY*10
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| 13 | S ESY=$E("-",ESLS)_ESY_"E"_ESLI Q
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| 14 | ;
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| 15 | LOG ; Called by routine YSEUT
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| 16 | D TEST G EXIT1:ESAB I ESLN=1 S (ESY,ESAB)=0 G EXIT1
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| 17 | D SCALE,CALC S ESY=ESY+ESLU/3.321928096+ESLZ G EXIT
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| 18 | ;
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| 19 | LN ; Called by routine YSEUT
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| 20 | D TEST G EXIT1:ESAB I ESLN=1 S (ESY,ESAB)=0 G EXIT1
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| 21 | D SCALE,CALC S ESY=ESLZ*3.321928094887+ESY+ESLU/1.442695040889 G EXIT ;1.442695040889=1/Ln(2) 3.32192809489=Ln(10)/Ln(2)
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| 22 | TEST S ESAB=1 Q:'$D(ESLN) S:'$D(ESE) ESE=0 Q:'(ESLN?1N.N!(ESLN?1N.N1"."1N.N)!(ESLN?1"."1N.N))
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| 23 | Q:ESLN>1E24!(ESLN=0) S ESAB=0 Q
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| 24 | SCALE S ESLI=ESLN\1,ESL1=$E(ESLN#1,2,40) ;LI=INT,L1=FRACT PARTS OF LN
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| 25 | S:ESLI=0 ESLI="" S ESLZ=$L(ESLI) S:ESL1=0 ESL1="" S ESL1=ESLI_ESL1
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| 26 | F ESY=1:1 Q:$E(ESL1)>0 S ESLZ=ESLZ-1,ESL1=$E(ESL1,2,40)
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| 27 | F ESY=0:1:3 Q:$E(ESL1)>4 S ESL1=ESL1*2
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| 28 | S ESL1="."_ESL1,ESY=-.5-ESY
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| 29 | Q
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