Common functions of MATLAB

1. Basic mathematical functions commonly used in MATLAB

ABS (x): absolute value of a pure volume or the length of a vector

Angle (z): Phase Angle)

SQRT (x): Square

Real (z): real part of the Plural Z

Imag (z): Virtual Part Of The Plural Z

Conj (z): the combination of the complex Z.

Round (x): returns the nearest integer.

Fix (x): whether positive or negative, remove the decimal point to the nearest integer.

Floor (x): floor function, that is, place a positive decimal number to the nearest integer.

Ceil (x): ceiling function, that is, adding a positive decimal to the nearest integer

Rat (x): converts a real number X into a score representation.

Rats (x): converts a real number X into multiple scores.

Sign (x): SIGNUM function ).

When x <0, sign (x) =-1;

When x = 0, sign (x) = 0;

When x> 0, sign (x) = 1.

REM (x, y): returns the remainder of X divided by Y.

Gcd (x, y): The maximum public factor of integer x and y

LCM (x, y): Minimum Public multiple of integer x and y

Exp (x): Natural Index

Pow2 (x): 2 Index

Log (x): The base-e logarithm, that is, the natural logarithm or

Log2 (x): base 2 logarithm

Log10 (x): Base-10 logarithm

Ii. trigonometric functions commonly used in MATLAB

Sin (x): sine function

Cos (x): returns the remainder function.

Tan (x): tangent function

Asin (x): arcsin Function

ACOs (x): returns the returns string function.

Atan (x): returns the arc tangent function.

Atan2 (x, y): arctangent function of four quadrants

Sinh (x): returns the sine of a number.

Cosh (x): returns a function that surpasses the remainder.

Tanh (x): returns the tangent of a given number.

Asinh (x): returns the arcwise sine function.

Acossh (x): returns an exclusive Chord function.

Atanh (x): returns the inverse tangent of a given number.

3. Common functions applicable to vectors include:

Min (x): minimum value of the element of vector x

Max (x): the maximum value of the element of vector x

Mean (x): average value of elements in vector x

Median (x): Median of elements in vector x

STD (x): Standard deviation of elements in vector x

Diff (x): The difference between adjacent elements of vector x

Sort (x): sorts elements of vector X)

Length (x): number of elements in vector x

Norm (x): euclidean (Euclidean) Length of vector x

Sum (x): Sum of elements in vector x

Prod (x): the total product of elements in vector x

Cumsum (x): Sum of the cumulative elements of vector x

Cumprod (x): the total product of cumulative elements of vector x

DOT (x, y): Inner Product of vector x and y

Cross (x, y): the outer product of the vectors x and y

Iv. Permanent constants of MATLAB

I or J: basic virtual number unit (I .e)

EPS: floating-point precision of the system

INF: infinite, such as 1/0

Nan or NAN: non-value (not a number), such as 0/0

Pi: circumference rate P (= 1415926 ...)

Realmax: the maximum value that the system can represent.

Realmin: Minimum value that the system can represent

Nargin: Number of input arguments of the Function

Nargin: Number of output arguments of a function

5. Basic plot functions of MATLAB

Plot: the X and Y axes are linear scales (linear scale)

Loglog: logarithmic scale)

Semilogx: the X axis is a logarithm scale, and the Y axis is a linear scale.

Semilogy: the X axis is a linear scale, and the Y axis is a logarithm scale.

Vi. Parameter Values of the plot Function

Character Color character line type

Y yellow. Dot

K black o circle

W white X

B blue ++

G green **

R red-solid line

C bright blue: dot line

M manganese purple-. dotted line

-- Dotted line

VII. Annotations

Xlabel ('input value'); % x axis Annotation

Ylabel ('function value'); % Y axis Annotation

Title ('two trigonometric Functions '); % graphic title

Legend ('y = sin (x) ', 'y = cos (x)'); % graphical Annotation

Grid on; % display grid lines

VIII. Two-Dimensional drawing functions

Bar Chart

Errorbar image plus error range

Fplot more precise function graphics

Polar polar coordinate chart

Hist accumulative Graph

Rose polar coordinate accumulative chart

Stairs step chart

Stem needle chart

Fill solid graph

Feather chart

Compass compass chart

Quiver Vector Field