2D semilogarithmic plot
semilogx // demo semilogx(y) semilogx(x, y) semilogx(x, fun) semilogx(x, list(fun, param)) semilogx(.., LineSpec) semilogx(.., LineSpec, GlobalProperty) semilogx(x1, y1, LineSpec1, x2,y2,LineSpec2,...xN, yN, LineSpecN, GlobalProperty1,.. GlobalPropertyM) semilogx(x1,fun1,LineSpec1, x2,y2,LineSpec2,...xN,funN,LineSpecN, GlobalProperty1, ..GlobalPropertyM) semilogx(axes_handle,...)
vector or matrix of strictly positive real numbers or integers. If omitted, it is assumed
to be the vector 1:n
where n
is the
number of curve points given by the y
parameter.
vector or matrix of real numbers or of integers.
handle of a function, as in semilogx(x, sin)
.
If the function to plot needs some parameters as input arguments, the
function and its parameters can be specified through a list, as in
semilogx(x, list(delip, -0.4))
This optional argument must be a string that will be used as a
shortcut to specify a way of drawing a line. We can have one
LineSpec
per y
or {x,y}
previously entered. LineSpec
options deals with
LineStyle, Marker and Color specifiers (see LineSpec).
Those specifiers determine the line style, mark style and color of
the plotted lines.
This optional argument represents a sequence of couple
statements {PropertyName,PropertyValue}
that defines
global objects' properties applied to all the curves created by this
plot. For a complete view of the available properties (see
GlobalProperty).
This optional argument forces the plot to appear inside the
selected axes given by axes_handle
rather than the
current axes (see gca).
semilogx
plots data using a base 10 logarithmic scale for the x-axis and a normal (linear) scale for the y-axis. The possible syntaxes and arguments are the same as the plot function besides the condition that the abscisae values in x argument be strictly positive.
If the current axes is not empty and the the x-axis has a negative lower bound then its scale will remain linear after the plot.
Enter the command semilogx
to see a demo.
w=logspace(-2,2,1000); s=%i*w; g=1../(s.^2+s+1); clf("reset") semilogx(w,abs(g)); title("$\LARGE \left|1/(s^2+s+1)\right|\mbox{ for }s=i\omega$") xlabel("$\LARGE \omega$") | ![]() | ![]() |
Version | Description |
6.1.1 | Function semilogx added. |