MATLAB Function Reference

loglog - Log-log scale plot

GUI Alternatives

To graph selected variables, use the Plot Selector in the Workspace Browser, or use the Figure Palette Plot Catalog. Manipulate graphs in plot edit mode with the Property Editor. For details, see Plotting Tools — Interactive Plotting in the MATLAB^® Graphics documentation and Creating Graphics from the Workspace Browser in the MATLAB Desktop Tools documentation.

Syntax

loglog(Y) loglog(X1,Y1,...) loglog(X1,Y1,LineSpec,...) loglog(...,'PropertyName',PropertyValue,...) h = loglog(...) hlines = loglog('v6',...)

Description

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 Xn versus Yn pairs. If only Xn or Yn is a matrix, loglog plots the vector argument versus the rows or columns of the matrix, depending on whether the vector's row or column dimension matches the matrix.

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(X1,Y1,X2,Y2,LineSpec,X3,Y3)

loglog(...,'PropertyName',PropertyValue,...) sets property values for all lineseries graphics objects created by loglog. See the line reference page for more information.

h = loglog(...) returns a column vector of handles to lineseries graphics objects, one handle per line.

Backward-Compatible Version

hlines = loglog('v6',...) returns the handles to line objects instead of lineseries objects.

Note The v6 option enables users of MATLAB Version 7.x to create FIG-files that previous versions can open. It is obsolete and will be removed in a future MATLAB version.

See Plot Objects and Backward Compatibility for more information.

Remarks

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 will remain as it is and the new data will plot as linear.

Examples

Create a simple loglog plot with square markers.

x = logspace(-1,2);
loglog(x,exp(x),'-s')
grid on