Determine the coefficient: first determine the coefficient of a quadratic equation, that is, the values of a, b and c ... calculate the discriminant: use the formula δ = b? -4ac calculation discriminant. Judging the type of root: according to the value of discriminant, judging the type of equation root. If δ > 0, the equation has two unequal real roots. If δ = 0, the equation has two equal real roots. If δ

Calculate δ >: if δ >; 0, calculate two unequal real roots with the formula x 1 = (-b+sqrt (δ))/(2a) and x2 = (-b-sqrt (δ))/(2a). If δ = 0, calculate two equal real roots with the formula x=-b/(2a).

If δ

Discriminant and discriminant function

Discriminant is a function to classify or cluster a set of data. This is a function that maps an input data set to an output label or category. The output result of discriminant indicates the category or specific attribute of input data. Discriminant is often used in classification problems in machine learning, pattern recognition, data mining and other fields.

Discriminant function means that after the discriminant region of each category is determined, some functions can be used to express and identify which category a feature vector belongs to. These functions are called discriminant functions. These functions are not mathematical descriptions of cluster shapes in feature space, but describe the situation that a position vector belongs to a certain category, such as the conditional probability of belonging to a certain category. Generally speaking, different categories have different discriminant functions.