matlab常用函数（Matlab function）.docVIP

matlab常用函数（Matlab function） 1. Basic mathematical functions commonly used in MATLAB Abs (x) : the absolute value of the scalar or the length of the vector Angle (z) : Phase Angle of complex z SQRT (x) : square Real (z) : real part of complex z Imag (z) : imaginary part of complex z Conj (z) : complex conjugate of complex z Round (x) : rounded to the nearest integer Fix (x) : regardless of the positive and negative, the decimal to the nearest integer Floor (x) : the floor function, that is, to give away the positive decimal to the nearest integer Ceil (x) : the ceiling function, which is to add a positive decimal to the nearest integer Rat (x) : the real x is the fraction representation Rats (x) : transform real number x into multiple fractions Sign (x) : Signum function. When x is less than 0, sign (x) = -1; When x is 0, sign (x) = 0; When x 0, sign (x) = 1. Rem (x, y) : the remainder of x divided by y GCD (x, y) : the greatest common factor of integer x and y LCM (x, y) : the least common multiple of integer x and y Exp (x) : natural index Pow2 (x) : 2 Log of x: log base e, the natural log or Log 2 of x: log base two Log of 10 (x) : log base 10 2. MATLAB used trigonometric functions Sine of x is the sine function Cosine of x: cosine Tangent of x: tangent function Asin (x) : the inverse sine function Acos (x) : the inverse cosine function Atan (x) : inverse tangent function Atan2 (x, y) : the four-quadrant inverse tangent function Sinh (x) : beyond the sine function Cosh (x) : beyond the residual string function Tanh (x) : beyond the tangent function Asinh (x) : the inverse sine function Acosh (x) : invert the residual string function Atanh (x) : inverse tangent function 3. Common functions applicable to vectors are: Min (x) : the minimum value of the element of x Max (x) : the maximum value of the element x Mean (x) : the average of the elements of x Median (x) : the median of the elements of the vector x STD (x) : the standard deviation of the element of x Diff (