Clear last check and last coefficient column on clear history.

mt5_correlation/correlation.py

@@ -10,6 +10,7 @@ from scipy.stats.stats import pearsonr
 import pickle
 import inspect
 import sys
+import numpy as np
 
 from mt5_correlation.mt5 import MT5
 
@@ -369,6 +370,10 @@ class Correlation:
         # Clear tick data
         self.__monitor_tick_data = {}
 
+        # Clear columns from coefficient data
+        self.coefficient_data['Last Check'] = np.NaN
+        self.coefficient_data['Last Coefficient'] = np.NaN
+
     def get_ticks(self, symbol, date_from=None, date_to=None, cache_time=0, cache_only=False):
         """
         Returns the ticks for the specified symbol. Get's from cache if available and not older than cache_timeframe.