Add testing script

demos/newamplitudes/easyinterface.py

+import nifty5 as ift
+
+sspace = ift.RGSpace((128, 128), (0.2, 0.2))
+hspace = sspace.get_default_codomain()
+target = ift.PowerSpace(hspace)
+
+vol = hspace.scalar_dvol**-0.5
+ft = ift.HartleyOperator(hspace, sspace).scale(vol)
+
+A = ift.NormalizedAmplitude(target, 16, 1, 1, -3, 1, 0, 1, 0, 1)
+
+avgA = ift.full(A.target, 0.)
+n = 1000
+for _ in range(n):
+    avgA = avgA + A(ift.from_random('normal', A.domain))
+avgA = avgA/n
+
+corfldfixA = ift.CorrelatedField(sspace, avgA)
+corfld = ift.CorrelatedField(sspace, A)
+
+p = ift.Plot()
+p1 = ift.Plot()
+lst, lst1 = [avgA**2], []
+for _ in range(8):
+    pos = ift.from_random('normal', corfld.domain)
+
+    skyfixA = corfldfixA.force(pos)
+    p.add(skyfixA)
+    lst.append(ift.power_analyze(ft.inverse(skyfixA)))
+
+    sky = corfld(pos)
+    p1.add(sky)
+    lst1.append(A.force(pos))
+p.add(lst)
+p1.add(lst1)
+p.output(name='mean_power_spectrum.png', xsize=15, ysize=15)
+p1.output(name='full.png', xsize=15, ysize=15)