MATLAB: Store only numbers from user input

arrayinputMATLABnumbers

Hi guys

Is there a way to store only the numbers from lets say an input of the type S^2+67*s+98

Best Answer

numstrs = regexp(TheString, '-?\d+', 'match');

then convert each of the cell strings returned in numstrs to numeric form. The -? part is to recognize an optional negative sign.

If you want to be able to accept floating point numbers, or if you want to recognize fractions as being numbers, or if you want to recognize pi as being a number, then the task gets more difficult.

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MATLAB: Edit user input

numstrs = regexp(TheString, '-?\d+(?=\s*s)', 'match');

and convert the resulting cells strings in to numeric forms.

The (?=\s*s) part is regexp-ese for "the expression after the '=' until the ')' must be matched in the input right after whatever was matched before this, but do not return this part as part of the match". Another way of phrasing this is that it "looks ahead" for the pattern but does not include it as part of what is matched.

\s*s stands for "any number of whitespace characters (including none), followed by the letter 's')

MATLAB: Regexp qwestion

TheString = 'gftr dsrew mkjghfdfsde'
out = regexprep(TheString,'s','1')

Best Answer

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MATLAB: Edit user input

MATLAB: Regexp qwestion

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