Log-log scale plot


h = loglog(...)


loglog(Y) plots the columns of Y versus their index if Y contains real numbers. If Y contains complex numbers, loglog(Y) and loglog(real(Y),imag(Y)) are equivalent. loglog ignores the imaginary component in all other uses of this function.

loglog(X1,Y1,...) plots all Yn versus Xn pairs. If only one of Xn or Yn is a matrix, loglog plots the vector argument versus the rows or columns of the matrix, along the dimension of the matrix whose length matches the length of the vector. If the matrix is square, its columns plot against the vector if their lengths match.

loglog(X1,Y1,LineSpec,...) plots all lines defined by the Xn,Yn,LineSpec triples, where LineSpec determines line type, marker symbol, and color of the plotted lines. You can mix Xn,Yn,LineSpec triples with Xn,Yn pairs, for example,


loglog(...,'PropertyName',PropertyValue,...) sets line property values for all the charting lines created. For a list of properties, see Line Properties.

loglog(ax,...) creates the line in the axes specified by ax instead of in the current axes (gca). The option ax can precede any of the input argument combinations in the previous syntaxes.

h = loglog(...) returns a column vector of chart line objects.

If you do not specify a color when plotting more than one line, loglog automatically cycles through the colors and line styles in the order specified by the current axes.

If you attempt to add a loglog, semilogx, or semilogy plot to a linear axis mode graph with hold on, the axis mode remains as it is and the new data plots as linear.


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Create a plot using a logarithmic scale for both the x-axis and the y-axis. Use a line with square markers. Display the grid.

x = logspace(-1,2);
y = exp(x);
grid on

Extended Capabilities

See Also



Introduced before R2006a