| [613] | 1 | ONCOSCOM ;WASH ISC/SRR-COMPUTATIONAL SUBROUTINES ;4/16/92 18:25
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| 2 | ;;2.11;ONCOLOGY;;Mar 07, 1995
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| 3 | ;This module contains entry points for the following computations:
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| 4 | ; EXP - compute the exponential
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| 5 | ; LOG10 - compute log to base 10
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| 6 | ; LOG2 - compute log to base 2
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| 7 | ; SQ - compute the square root
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| 8 | ;
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| 9 | ;
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| 10 | EXP ;compute the exponential EXP(X)
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| 11 | ;in: X = argument must be less than 55.26
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| 12 | ;out: Y = EXP(X)
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| 13 | ; Z = 1 for any problem in evaluations, 0 otherwise
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| 14 | N F,I,LE,LZ,S
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| 15 | S LE=.434294482,LZ=X,X=LE*X
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| 16 | S Z=0,S=0 I X=0 S Y=1 G QEXP
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| 17 | I +X'=X S Z=1 G QEXP
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| 18 | I X<0 S S=1,X=-X
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| 19 | S F=X#1,I=X\1,I="1E"_$E("-",S&I)_I
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| 20 | S Y=.00093264267*F+0.00255491796*F+0.01742111988*F+0.07295173666*F+0.25439357484*F+0.66273088429*F+1.15129277603*F+1
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| 21 | S Y=Y*Y
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| 22 | QEXP S:S Y=1/Y S Y=+$J(Y+0.000000005,0,8),Y=Y*I,X=LZ
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| 23 | Q
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| 24 | ;
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| 25 | LOGE ;compute log to base E
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| 26 | ;arguments same as LOG10
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| 27 | D LOG2 I 'Z S Y=+$J(Y/1.44269504,0,8)
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| 28 | Q
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| 29 | ;
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| 30 | LOG10 ;compute log to base 10
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| 31 | ;in: X = argument
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| 32 | ;out: Y = LOG10(X)
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| 33 | ; Z = 1 if Y not evaluated, 0 otherwise
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| 34 | D LOG2 I 'Z S Y=+$J(Y/3.321928096,0,8)
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| 35 | Q
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| 36 | ;
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| 37 | LOG2 ;compute log to base 2
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| 38 | ;arguments are as above
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| 39 | N LU,LV,LZ
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| 40 | I X'>0!(+X'=X) S Z=1 Q
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| 41 | S LZ=$L($P(X,".",1))
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| 42 | I LZ S X="."_$E(X,1,LZ)_$E(X,LZ+2,255),X=+X
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| 43 | E F LZ=LZ:-1 Q:X'<.1 S X=X*10
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| 44 | F Y=0:1:3 Q:X'<.5 S X=X*2
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| 45 | S LU=X-.707106781/(X+.707106781),LV=LU*LU
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| 46 | S LU=.434259751292*LV+.576584342056*LV+.961800762286*LV+2.885390072738*LU
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| 47 | S Y=+$J(LZ*3.321928096+LU-Y-.5,0,8),Z=0
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| 48 | Q
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| 49 | ;
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| 50 | SQ ;compute square root
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| 51 | ;in: X = argument for square root
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| 52 | ;out: Y = sq root of X if X'<0, of -X if X<0
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| 53 | ; Z = 1 if X<0, 0 otherwise
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| 54 | S Z=(X<0) I X=0 S Y=0 Q
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| 55 | I Z S X=-X
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| 56 | I X>1 S Y=X\1
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| 57 | E S Y=1/X
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| 58 | S Y=$E(Y,1,$L(Y)+1\2)
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| 59 | E S Y=1/Y
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| 60 | F %=1:1:6 S Y=X/Y+Y*.5
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| 61 | Q
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| 62 | ;
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| 63 | TEST ;test LOGE & EXP
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| 64 | N I
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| 65 | F I=1:1:20 W !,I,?10 S X=I*1.33333 W X D LOGE W ?25,Y S X=Y D EXP W ?40,Y,?60,Z
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| 66 | Q
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