例1.15.txt

《MATLAB在控制系统中的应用》实例程序

 例1.15   help+函数（类）名。
>> help elfun					% help+函数类名。
Elementary math functions.
Trigonometric.
sin         - Sine.
sinh        - Hyperbolic sine.
asin        - Inverse sine.
asinh       - Inverse hyperbolic sine.
cos         - Cosine.
cosh        - Hyperbolic cosine.
acos        - Inverse cosine.
acosh       - Inverse hyperbolic cosine.
  …
	Exponential.
exp         - Exponential.
log         - Natural logarithm.
log10       - Common (base 10) logarithm.
  …
   Complex.
abs         - Absolute value.
angle       - Phase angle.
complex     - Construct complex data from real and imaginary parts.
conj        - Complex conjugate.
imag        - Complex imaginary part.
real        - Complex real part.
…
>> help inv                  % help+函数名。
 INV    Matrix inverse.
INV(X) is the inverse of the square matrix X.
A warning message is printed if X is badly scaled or
nearly singular.
 See also SLASH, PINV, COND, CONDEST, LSQNONNEG, LSCOV.
Overloaded methods
  help gf/inv.m
  help zpk/inv.m
  help tf/inv.m
  help ss/inv.m
  help lti/inv.m
  help frd/inv.m
  help sym/inv.m
  help idmodel/inv.m
  …