MATLAB 函数Semilogy()

它使用x的线性标度和y的对数标度来生成x和y值的图。

句法

semilogy(Y) //	It generates a plot using a base 10 logarithmic scales for the y-axis and linear scales for the x-axis. It plots the column of Y versus their index.
semilogy(X1, Y1, ...)//	     It plots all Yn versus Xn pairs.
semilogy(X1, Y1, LineSpec, ...)// It plots all the lines described by the Xn, Yn, LineSpec triples. LineSpec determine line style, marker symbol, and color of the plotted lines.
semilogy(..., 'PropertyName', PropertyValue, ...)//  It sets property values for all the charting lines created by semilogy. 
semilogy(ax, ...)//     It generates the line in the axes specified by ax instead of in the current axes (gca). The option ax precedes any of the input argument combinations in the previous syntaxes.
h = semilogy(...)//   It returns a vector of chart line objects.

例子

创建一个图, y轴为对数刻度, x轴为线性刻度。

x=t, y=e^t, 0≤t≤2π
t=linspace (0, 2*pi, 200);
semilogy(t, exp(t))
grid

输出