| 1 | import math |
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| 2 | # arrays to fill |
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| 3 | resx=numpy.zeros(200) |
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| 4 | resy=numpy.zeros(200) |
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| 5 | rese=numpy.zeros(200) |
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| 6 | resChi=numpy.zeros(200) |
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| 7 | res0=numpy.zeros(200) |
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| 8 | resNZ=numpy.zeros(200) |
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| 9 | NB=10000 # number of bins |
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| 10 | x12arr=numpy.zeros(NB) |
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| 11 | y12arr=numpy.zeros(NB) |
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| 12 | e12arr=numpy.zeros(NB) |
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| 13 | ws=CreateWorkspace(x12arr,y12arr,e12arr,1,OutputWorkspace="Hello") |
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| 14 | for x in range(200): |
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| 15 | lam=math.exp((x-75.0)/10.0) # expected rate (log scale to show detail) |
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| 16 | Xarr=range(NB) # "time" bins |
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| 17 | Yarr=numpy.random.poisson(lam,NB) # actual counts |
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| 18 | Earr=numpy.sqrt(Yarr) # and the errors |
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| 19 | ws.dataX(0)[:]=Xarr |
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| 20 | ws.dataY(0)[:]=Yarr |
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| 21 | ws.dataE(0)[:]=Earr |
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| 22 | (stat,chisq,Covar,params,curves)=Fit(Function="name=FlatBackground,A0=1.0",InputWorkspace="Hello",Output="Hello") |
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| 23 | print lam," -> ",params.column(1)[0]," +- ",params.column(2)[0]," chisq=",chisq," st=",stat |
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| 24 | resx[x]=lam |
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| 25 | resy[x]=params.column(1)[0] |
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| 26 | rese[x]=params.column(2)[0] |
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| 27 | resNZ[x]=(len(Yarr)-numpy.count_nonzero(Yarr))/(len(Yarr)+0.0) |
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| 28 | resChi[x]=chisq |
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| 29 | |
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| 30 | DeleteWorkspace("Hello") |
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| 31 | CreateWorkspace(resx,resy,rese,1,OutputWorkspace="Summary") # what the fit thought the count rate was |
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| 32 | CreateWorkspace(resx,resx,res0,1,OutputWorkspace="Ideal") # the intended count rate to plot alongside |
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| 33 | CreateWorkspace(resx,resNZ,res0,1,OutputWorkspace="FractionOfZeros") |
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| 34 | CreateWorkspace(resx,resChi,res0,1,OutputWorkspace="ChiSquared") |
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| 35 | |
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| 36 | Minus(LHSWorkspace='Summary',RHSWorkspace='Ideal',OutputWorkspace='FitDifference') |
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| 37 | Divide(LHSWorkspace='Summary',RHSWorkspace='Ideal',OutputWorkspace='FitRatio') |
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| 38 | |
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| 39 | p=plotSpectrum("FitDifference",0,True) |
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| 40 | l=p.activeLayer() |
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| 41 | l.setAxisScale(Layer.Bottom,0.001,1000000.0,Layer.Log10) |
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| 42 | |
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| 43 | p2=plotSpectrum("FitRatio",0,True) |
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| 44 | l2=p2.activeLayer() |
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| 45 | l2.setAxisScale(Layer.Bottom,0.001,1000000.0,Layer.Log10) |
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