| [807] | 1 | # $Id: dpsManip.py,v 1.2 2003/06/16 17:06:44 dressel Exp $
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| 2 | # -------------------------------------------------------------------
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| 3 | # GEANT4 tag $Name: $
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| 4 | # -------------------------------------------------------------------
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| 5 | #
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| 6 | import math
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| 7 |
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| 8 | # functions to manipulate a DPS (data point set)
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| 9 |
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| 10 | def getScaledDPS(hSrc, scale, df, name):
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| 11 | "Create a scaled DPS from a histogramm."
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| 12 | hSrc.scale(scale)
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| 13 | dp = df.create(name, hSrc)
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| 14 | setDPSErrorsToZero(dp, 0)
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| 15 | hSrc.scale(1./scale)
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| 16 |
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| 17 | return dp
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| 18 |
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| 19 |
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| 20 | def setDPSErrorsToZero(dps, coNum):
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| 21 | "Set errors of a DPS to zero."
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| 22 | for i in range(dps.size()):
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| 23 | p = dps.point(i)
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| 24 | co = p.coordinate(coNum)
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| 25 | co.setErrorMinus(coNum)
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| 26 | co.setErrorPlus(coNum)
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| 27 |
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| 28 | def copyDPS(dSrc, df, name):
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| 29 | "Make a copy of a DPS using the data point set factory df."
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| 30 | dp = df.create(name, dSrc.dimension ())
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| 31 | for i in range( dSrc.size() ):
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| 32 | dp.addPoint()
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| 33 | pNew = dp.point(i)
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| 34 | pOld = dSrc.point(i)
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| 35 | for d in range(dSrc.dimension ()):
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| 36 | cOld = pOld.coordinate(d)
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| 37 | cNew = pNew.coordinate(d)
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| 38 | cNew.setValue(cOld.value())
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| 39 | em = cOld.errorMinus()
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| 40 | ep = cOld.errorPlus()
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| 41 | cNew.setErrorMinus(em)
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| 42 | cNew.setErrorPlus(ep)
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| 43 | return dp
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| 44 |
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| 45 | def dLogWeightDPS(dSrc, df, name, binEdges):
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| 46 | """Create a dps with the coordinate 1 scaled by 1/dlog(coordinate 0).
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| 47 | """
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| 48 | dp = copyDPS(dSrc, df, name)
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| 49 | for i in range(len(binEdges) - 1):
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| 50 | s = math.log(binEdges[i+1]) - math.log(binEdges[i])
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| 51 | c = dp.point(i).coordinate (1)
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| 52 | value = dSrc.point(i).coordinate(1).value()
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| 53 | errorMinus = dSrc.point(i).coordinate(1).errorMinus()
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| 54 | errorPlus = dSrc.point(i).coordinate(1).errorPlus()
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| 55 | c.setValue(value / s)
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| 56 | c.setErrorMinus(errorMinus / s)
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| 57 | c.setErrorPlus(errorPlus / s)
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| 58 | return dp
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| 59 |
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| 60 |
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| 61 | def createScaledDPS(coNum, pDataO, df, name, scale):
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| 62 | """Create a scaled DPS from a DPS.
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| 63 |
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| 64 | The coordinate \'coNum\' of the source DPS \'pDataO\' is scaled by
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| 65 | \'scale\'. The result is returned in the DPS created by the given
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| 66 | data point set factory \'df\' named \'name\'.
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| 67 | """
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| 68 | dp = copyDPS(pDataO, df, name)
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| 69 | for i in range( dp.size() ):
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| 70 | p = dp.point(i)
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| 71 | co = p.coordinate(coNum)
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| 72 | co.setValue(co.value()*scale)
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| 73 | co.setErrorMinus(co.errorMinus()*scale)
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| 74 | co.setErrorPlus(co.errorPlus()*scale)
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| 75 | return dp
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| 76 |
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| 77 |
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| 78 |
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| 79 | def getBinEdges(h):
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| 80 | "Get bin edges of a histogramm."
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| 81 | binEdges = []
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| 82 | a = h.axis ()
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| 83 | for i in range(a.bins ()):
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| 84 | binEdges.append(a.binLowerEdge(i))
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| 85 | binEdges.append(a.binUpperEdge(a.bins () - 1))
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| 86 | return binEdges
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| 87 |
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| 88 |
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| 89 |
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| 90 |
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