1, there is no difference. " "*" and "*" in the operation between numbers both represent ordinary multiplication operation. For example: m = 2, n = 3, m*n = 6, m * n = 6.

2. The meaning of ". * "and" * "are different when calculating between matrices. Suppose that a and b represent two matrices, a*b represents matrix multiplication of matrix A and matrix B, and a.*b represents the elements in matrix A and matrix B are multiplied in sequence by position, and the obtained results will be taken as elements in the same position in the new matrix.

3. A special symbol is used in 3.MATLAB to distinguish matrix operation from array operation. When it is necessary to distinguish between the two, put the dot in front of the symbol to indicate that this is an array operation (for example. *). Line and surface give some common array and matrix operations. Array addition: A+B. Array addition is the same as matrix addition.

Array subtraction: A- B, array subtraction is the same matrix subtraction.

Array multiplication: A.*B, the elements of A and B are multiplied one by one, and the two arrays must have the same shape, or one of them is a scalar.

Matrix multiplication: matrix multiplication of A*B, a and b, the number of columns of a must be the same as the number of rows of b.

Right division of array: A./B, elements of a and b are divided one by one; The two arrays A(i, j)/B(i, j) must have the same shape, or one of them is a scalar.

Array left division: A.\B, elements of a and b are divided one by one; The two arrays B(i, j)/A(i, j) must have the same shape, or one of them is a scalar.

Extended data:

Banana optimization exhibition-style banana optimization.

S show filter DEM: filter effect demonstration filter effect demonstration.

Show filter DEM 2: filter design demonstration.

Cztdemo :FFT and CZT (two different types of Z transform algorithms).

Telephone: Demonstrate the relationship between the time and frequency of telephone conversation.

Sigdemo 1: Time-frequency diagram of discrete signals, which can be set with the mouse.

Sigdemo2: Time-frequency diagram of continuous signal, which can be set with the mouse.

Filtdemo: interactive design of low-pass filter.

Modulation of sound signal.

Sosdemo: digital filter slice.

Nerve: Neural network module group.

FIRdemo: two-dimensional fir filter.

Nonlinear filter.

Dctdemo :DCT demonstration.

Mlpdm 1: Using multilayer perceptron neural network to fit curve animation.

Mlpdm2: Using multilayer perceptron neural network to perform XOR operation.

Invkine: inverse problem of motion.

Juggler: The trick of jumping.

fcmdemo :FCM .

Slcp: Similar to inverted pendulum animation.

Slcp 1: Handcart and pole changer similar to inverted pendulum animation.

Slcpp 1: Similar to inverted pendulum animation, there are two pendulums, one of which can be changed.

Sltbu: truck support.

Slbb: It's like a seesaw.

Baidu encyclopedia -MATLAB