| 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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