# Documentation

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# loglog

Log-log scale plot

## Syntax

```loglog(Y) loglog(X1,Y1,...) loglog(X1,Y1,LineSpec,...) loglog(...,'PropertyName',PropertyValue,...) loglog(ax,...) h = loglog(...) ```

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

`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.

## Examples

collapse all

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); loglog(x,y,'-s') grid on```