switch from .at to .loc to update parameters dataframe (issue pandas-dev/pandas#46036)

Author: pierremillard

multinmrfit/base/spectrum.py

@@ -94,7 +94,7 @@ def set_params(self, signals):
                     #logger.debug("update parameter {} - {} to {}".format(par, k, v))
                     self.models[id].set_params(par, (k, v))
                     # update self.params
-                    self.params.at[(self.params["signal_id"] == id) & (self.params["par"] == par), k] = v  
+                    self.params.loc[(self.params["signal_id"] == id) & (self.params["par"] == par), k] = v  
 
 
     def set_offset(self, offset):

multinmrfit/models/base_model.py

@@ -18,7 +18,7 @@ def get_params(self):
 
     def set_params(self, name: str, val: tuple):
         try:
-            self._params.at[self._params["par"] == name, val[0]] = val[1]
+            self._params.loc[self._params["par"] == name, val[0]] = val[1]
         except:
             if name not in self._params["par"].values:
                 raise ValueError("parameter '{}' not found".format(name))