Fixed a bug that tried to fit VST tests containing non-finite data

RSTpicking/RST_Func.py

@@ -396,9 +396,19 @@ def fitfric(x, a, b):
 # %%=====================VELOCITY STEPPING ANALYSIS============================
 def vst_analysis(data):
     mu_app = data['shearstress']/data['normalstress']  # Apparent friction
+    logvel = np.log10(data['velocity'])
+
+    # Remove nonfinite values for fitting
+    onlyfinite = np.isfinite(mu_app)
+    mu_app = mu_app[onlyfinite]
+    logvel = logvel[onlyfinite]
+    onlyfinite = np.isfinite(logvel)
+    mu_app = mu_app[onlyfinite]
+    logvel = logvel[onlyfinite]
+
     pfit, pcov = curve_fit(
         fitfric,
-        np.log10(data['velocity']),
+        logvel,
         mu_app
     )
     perr = 2*np.sqrt(np.diag(pcov))