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FreeMat
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Section: Array Generation and Manipulations
Converts an array into its string representation. The general syntax for this function is
s = num2str(X)
where s is a string (or string matrix) and X is an array. By default, the num2str function uses 4 digits of precision and an exponent if required. If you want more digits of precision, you can specify the precition via the form
s = num2str(X, precision)
where precision is the number of digits to include in the string representation. For more control over the format of the output, you can also specify a format specifier (see printf for more details).
s = num2str(X, format)
where format is the specifier string.