MATLAB POLYSPACE 7 Guia de Instalação descarregar pdf (Página 276)

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5 Workspace, Search Path, and File Operations

action so that MATLAB runs the file you want—for more information, see

“How the Search Path Determines Which Function to Use” on page 5-24.

ThesearchpathisalsoreferredtoastheMATLAB path. Directories included

areconsideredtobeon the path. When you include a directory in the search

path, you add it to the path. Subdirectories must be explicitly added to the

path; they are not on the path just beca use their parent directories are.

Adding directories to the path is similar to performing an include or import

in some other applications.

For instructions to view the search path and add directories to it, see “Viewing

and Setting the Search Path” on page 5-26, including “Caution Against Saving

Files in matlabroot/toolbox” on page 5-31.

How the Search Path Determines Which Function to

Use

The order of directories on the path is relevant. M ATLAB looks for a named

element, for example,

foo, as described here. If you enter foo at the M ATLAB

prompt, MATLAB p erforms the following actio ns :

1 Looks f or foo as a variable.

2 Looks in the current directory for a file named foo.m.

3 Searches the directories on the MATLAB search path, in order, for foo as a

built-in function, followed by

foo.m which is not built-in.

If there is more than one function with the same name, the order of directories

on the p ath determines which of those functions MATLAB uses. When

MATLAB looks for that function, it uses the first one found in the search path:

• To use a function with the same name that is located in a directory further

down on the search path, called a shadowed function, make its location

the current directory. For M -file scripts, you can use

run with the full

pathname for the M-file. For example, use

run d:/mymfiles/foo.m to

ensure that version of

foo runs. Another option is to move the d irectory

containing the shadowed function to a position in the search path ahead of

the directory containing the file of the same name. For example, add it to

the top of the search path.

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