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Convert string to double-precision value


X = str2double('str')
X = str2double(C)


X = str2double('str') converts the string str, which should be an ASCII character representation of a real or complex scalar value, to the MATLAB® double-precision representation. The string can contain digits, a comma (thousands separator), a decimal point, a leading + or - sign, an e preceding a power of 10 scale factor, and an i for a complex unit.

If str does not represent a valid scalar value, str2double returns NaN.

X = str2double(C) converts the strings in the cell array of strings C to double precision. The matrix X returned will be the same size as C.


Here are some valid str2double conversions, for numbers and cell arrays.

str2double('123 + 45i')
str2double('2.7i - 3.14')
str2double({'2.71' '3.1415'})

See Also

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Introduced before R2006a

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