def foods_for_nutrient(self, nutrient_name, scale_by=1.0):
# a helper function that computes the scaled sum of all food variables
# for a given nutrient
relevant_foods = []
for row in self.food_table:
var = self.variable_dict[row['description']]
nutrient_amount = row[nutrient_name]
if nutrient_amount > 0:
relevant_foods.append(scale_by * nutrient_amount * var)
if len(relevant_foods) == 0:
print('Warning! Nutrient %s has no relevant foods!'.format(nutrient_name))
return
return SumArray(relevant_foods)
def Sum(self, expr_array):
result = SumArray(expr_array)
return result