Inital comit.

Basic transfer function and tank impedance plotting

pySmithPlot/smithplot/smithhelper.py

@@ -0,0 +1,60 @@
+# -*- coding: utf-8 -*-
+# last edit: 11.04.2018
+
+from collections import Iterable
+
+import numpy as np
+
+INF = 1e9
+EPSILON = 1e-7
+TWO_PI = 2 * np.pi
+
+
+def xy_to_z(*xy):
+    if len(xy) == 1:
+        z = xy[0]
+        if isinstance(z, Iterable):
+            z = np.array(z)
+            if len(z.shape) == 2:
+                z = z[0] + 1j * z[1]
+            elif len(z.shape) > 2:
+                raise ValueError("Something went wrong!")
+    elif len(xy) == 2:
+        x, y = xy
+        if isinstance(x, Iterable):
+            if isinstance(y, Iterable) and len(x) == len(y):
+                z = np.array(x) + 1j * np.array(y)
+            else:
+                raise ValueError("x and y vectors dont match in type and/or size")
+        else:
+            z = x + 1j * y
+    else:
+        raise ValueError("Arguments are not valid - specify either complex number/vector z or real and imaginary number/vector x, y")
+
+    return z
+
+
+def z_to_xy(z):
+    return z.real, z.imag
+
+
+def moebius_z(*args, norm):
+    z = xy_to_z(*args)
+    return 1 - 2 * norm / (z + norm)
+
+
+def moebius_inv_z(*args, norm):
+    z = xy_to_z(*args)
+    return norm * (1 + z) / (1 - z)
+
+
+def ang_to_c(ang, radius=1):
+    return radius * (np.cos(ang) + np.sin(ang) * 1j)
+
+
+def lambda_to_rad(lmb):
+    return lmb * 4 * np.pi
+
+
+def rad_to_lambda(rad):
+    return rad * 0.25 / np.pi