Finding lines that contain specified text. Here is a file containing some text. This returns a list of all the lines in the file containing the text is.

Mathematica has uniquely flexible capabilities for processing large volumes of textual data. Most often data represented as a string is converted to lists or other constructs ...

Even simple-looking limits are sometimes quite complicated to compute. Mathematica provides functionality to evaluate several kinds of limits.

FileNames[] lists all files in the current working directory. FileNames[form] lists all files in the current working directory whose names match the string pattern form. ...

File system directory hierarchy. Can contain files and subdirectories.

NameQ["string"] yields True if there are any symbols whose names match the string pattern given, and yields False otherwise.

MathLink connections between Mathematica sessions. This starts up a link on port number 8000. This connects to the link on port 8000.

Extensively used within the Mathematica system itself, MathLink is Mathematica's unique high-level symbolic interface standard for interprogram communication. With convenient ...

Pick[list, sel] picks out those elements of list for which the corresponding element of sel is True. Pick[list, sel, patt] picks out those elements of list for which the ...

Built into Mathematica are state-of-the-art constrained nonlinear fitting capabilities, conveniently accessed with models given directly in symbolic form. Mathematica also ...