Documentation

lookfor

Search for keyword in all help entries

Syntax

``lookfor keyword``
``lookfor keyword -all``

Description

example

````lookfor keyword` searches for the specified keyword in the first comment line (the H1 line) of the help text in all MATLAB® program files found on the search path. For all files in which a match occurs, `lookfor` displays the H1 line.`lookfor` is useful if you are searching for a function and you do not know its name. To find a function whose name you already know, use the `what` and `which` functions, which run much faster.```

example

````lookfor keyword -all` searches the entire first comment block of a MATLAB program file.```

Examples

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Search for the word `literal` in the H1 line of the help text for all MATLAB program files.

`lookfor inverse`
```invhilb - Inverse Hilbert matrix. ipermute - Inverse permute array dimensions. dramadah - Matrix of zeros and ones with large determinant or inverse. invhess - Inverse of an upper Hessenberg matrix. betaincinv - Inverse incomplete beta function. ...```

Search for the word `literal` in all of the help text for all MATLAB program files.

`lookfor inverse -all`
```bsxfun: @atan2 Four-quadrant inverse tangent; result in radians bsxfun: @atan2d Four-quadrant inverse tangent; result in dgrees gallery: dramadah Matrix of ones and zeroes whose inverse has large integer entries. gallery: invhess Inverse of an upper Hessenberg matrix. hilb: calculates the exact inverse. invhilb: Inverse Hilbert matrix. invhilb: IH = INVHILB(N) is the inverse of the N-by-N matrix with elements ipermute: Inverse permute array dimensions. ipermute: A = IPERMUTE(B,ORDER) is the inverse of permute. IPERMUTE rearranges ...```

Input Arguments

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Keyword to search for, specified as a character vector or string scalar.

Alternative Functionality

As an alternative to the `lookfor` command, use the find features in the Current Folder browser. For example, you can look for all occurrences of a specified word in all the MATLAB program files in the current folder and its subfolders. For more information, see Find Files and Folders.

To search the documentation, including third-party and custom documentation, use the `docsearch` function.