The following example code uses the V1 peak finder which can be found here to obtain an array of peaks.
from ImgAlgos.PyAlgos import PyAlgos
from psana import *
ds = DataSource('exp=xcs06016:run=37:smd')
det = Detector('epix_2')
alg = PyAlgos()
alg.set_peak_selection_pars(npix_min=1, npix_max=4, amax_thr=0, atot_thr=35, son_min=0)
centroids = []
for nevent, evt in enumerate(ds.events()):
if nevent == 25:
break
nda = det.calib(evt)
peaks = alg.peak_finder_v1(nda, thr_low=10, thr_high=30, radius=1, dr=0)
for p in peaks:
centroids.append([p[6], p[7]])
print '%d total peaks.' % len(centroids)
centroids = np.array(centroids)
calib = CentroidSmootherCalib()
calib.add(centroids)
calib.save(ds, det, 0)
cs = CentroidSmoother(ds, det, evt.run())
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