Programming and Data Types

Categorizing Characters Within a String

There are two functions for categorizing characters inside a string:

• isletter determines if a character is a letter
• isspace determines if a character is whitespace (blank, tab, or new line)

For example, create a string named mystring.

• mystring = 'Room 401'; 
  

isletter examines each character in the string, producing an output vector of the same length as mystring.

• A = isletter(mystring)
  A = 
      1   1   1   1   0   0   0   0
  

The first four elements in A are 1 (true) because the first four characters of mystring are letters.

Comparing for Equality Using Operators

Searching and Replacing