# strtod

convert string to double

## Calling Sequence

                d =  strtod(str [,decimalseparator])
                [d, endstr] = strtod(str [,decimalseparator])

## Arguments

str

  a character string or matrix of character strings.

decimalseparator

  the decimal separator chosen: "." (by default) or ",".

d

  a real or matrix of reals.

endstr

  a character string or matrix of character strings (next character in `str` after the numerical value).

## Description

`[d, endstr] = strtod(str)` parses strings `str` interpreting its content as a floating point number and returns its value as a real. If `str` does not contain any numerical value then `d` equals `Nan`.

## Remarks

- This function is based on the strtod C function which causes different behaviors on Windows and Linux. In fact, on Windows, it is possible to use d or D for exponents, but it is not possible to use hexadecimal numbers.

- Note that `strtod("%inf")` returns `Nan`.

## Examples

    strtod('123.556This is a sample real')
    strtod('123,556This is a sample real', ",")
    [d,endstr] = strtod('123.556This is a sample real')
    strtod(['123.556This is a sample real','888.666 here'])
    [d,endstr] =strtod(['123.556This is a sample real','888.666 here'])
    [d,endstr] =strtod(['123.556This is a sample real','888,666 here'], ",")

## History

5.5.0
New optional input: decimalseparator (SEP 97).
5.4.1
If `str` does not contain any numerical value then `d` equals `Nan` instead of `0` in previous versions.