Programming |

**Converting from String to Numeric**

The functions listed in this table provide a number of ways to convert character strings to numeric data.

Function |
Description |
Example |

`uintN` (e.g., `uint8)` |
Convert a character to an integer code that represents that character. |
`'Hi'` `72 105` |

`str2num` |
Convert a character type to a numeric type. |
`'72 105'` `[72 105]` |

`str2double` |
Similar to `str2num` , but offers better performance and works with cell arrays of strings. |
`{'72' '105'}` ` [72 105]` |

`hex2num` |
Convert a numeric type to a character type of specified precision, returning a string that MATLAB can evaluate. |
`'A'` `'-1.4917e-154'` |

`hex2dec` |
Convert a character type of hexadecimal base to a positive integer. |
`'A'` `10` |

`bin2dec` |
Convert a positive integer to a character type of binary base. |
`'1010'` `10` |

`base2dec` |
Convert a positive integer to a character type of any base from 2 through 36. |
`'12'` `10` (if `base` == `8` ) |

**Converting from a Character Equivalent**

Character arrays store each character as a 16-bit numeric value. Use one of the integer conversion functions (e.g., `uint8`

) or the `double`

function to convert strings to their numeric values, and `char`

to revert to character representation:

name = 'Thomas R. Lee'; name = double(name) name = 84 104 111 109 97 115 32 82 46 32 76 101 101 name = char(name) name = Thomas R. Lee

**Converting from a Numeric String**

Use `str2num`

to convert a character array to the numeric value represented by that string:

The `str2double`

function converts a cell array of strings to the double-precision values represented by the strings:

c = {'37.294e-1'; '-58.375'; '13.796'}; d = str2double(c) d = 3.7294 -58.3750 13.7960 whos Name Size Bytes Class c 3x1 224 cell array d 3x1 24 double array

**Converting from a Specific Radix**

To convert from a character representation of a nondecimal number to the value of that number, use one of these functions: `hex2num`

, `hex2dec`

, `bin2dec`

, or `base2dec`

.

The `hex2num`

and `hex2dec`

functions both take hexadecimal (base 16) inputs, but `hex2num`

returns the IEEE double-precision floating-point number it represents while `hex2dec`

converts to a decimal integer.

Converting from Numeric to String | Function Summary |

© 1994-2005 The MathWorks, Inc.