We use three numbers to represent the three-dimensional position of an object in space, and a custom array to describe the characteristics of the object.

for instance

a=[4，8， 1]

b=[0， 1， 1，0， 1]

explain

The position of the object is in matrix A, where the coordinate x axis is equal to 4, the coordinate y axis is equal to 8, and the coordinate z axis is equal to 1.

The description of the corresponding number of object features is stored in matrix B. The first 0 can indicate that it is white, the second 1 can indicate that it is soft, the third 1 can indicate that it is edible, the fourth 0 can indicate that it has no fixed shape, and the last 1 can indicate that it is made of beans.

The general expression is the characteristics of tofu. We just give numbers external meaning, but they are still numbers inside.

When a variable is represented by both the direction matrix and the quantity matrix * * *, it is a vector with both magnitude and direction.