# lookfor

## Purpose

Keyword search through all help entries.

## Synopsis

    lookfor topic

## Description

The command

     lookfor xyz

looks for the string `xyz` in the first comment line (the H1 line) of the help text in all M-files found on MATLAB's search path. For all files in which a match occurs, `lookfor` displays the H1 line.

## Examples

For example

    lookfor inverse

finds at least a dozen matches, including H1 lines containing "inverse hyperbolic cosine", "two-dimensional inverse FFT", and "pseudoinverse." Contrast this with

    which inverse

or

    what inverse

These commands run more quickly, but probably fail to find anything because MATLAB does not ordinarily have a function `inverse`.

In summary, `what` lists the functions in a given directory, `which` finds the directory containing a given function, and `lookfor` finds all functions in all directories that might have something to do with a given keyword.

## See Also

    dir, help, what, which, who

(c) Copyright 1994 by The MathWorks, Inc.