Plots a given dataset in 2D axes with logarithmic scales for y axis.


h = semilogy(y)

h = semilogy(x, y)

h = semilogy(x, y, x, y, …)

h = semilogy(x, y, fmt)

h = semilogy(…, property, value, …)

h = semilogy(hAxes, …)


x, y
Range of the x and y axes..
Type: double | integer
Dimension: scalar | vector | matrix
Formatting string for the curve. It can be any combination for the following strings:
  1. line style: '-', '-.', ':', '--".
  2. line color: 'r', 'g', 'b', 'c', 'y', 'm', 'w', 'b'.
  3. marker style: 's', 'o', 'd', 'x', 'v', '^', '+', '*', '.'.
Type: string
Dimension: scalar
Properties that control the appearance or behavior of the graphics object .
Type: string
Dimension: scalar
Value of properties.
Type: double | integer | string
Dimension: scalar | vector
Axis handle. .
Type: double
Dimension: scalar


Handle of the line graphics object.


Simple semilogy example.

semilogy(rand(1, 10));


If x is omitted, the index of y is used as data to associate with x axis. semilogy takes the optional arguments to control the line style. It can be either a format string or property/value pair(s), or both. The form is:
h = semilogy([x,] y [, fmt] [, property, value] …)
semilogy takes more arguments to create multiple lines in one axes:
h = semilogy(x, y, x, y, …)
h = semilogy([x,] y [, fmt] [, property, value], [x,] y [, fmt] [, property, value] …) 
If the first argument of semilogy() is an axes handle, lines will be created in that axes:
h = semilogy(hAxes, …)