how to find the molecular weight of an object in matlab

main.m
% Define the chemical formula of the compound
formula = 'H2O';

% Define the atomic weights of each element
atomicWeights = [1.0079, 15.999];

% Split the formula into its elemental components
elements = regexp(formula, '([A-Z][a-z]?\d*)', 'match');

% Calculate the molecular weight
molecularWeight = 0;
for i = 1:length(elements)
    % Extract the element symbol and the number of atoms
    [element, numAtoms] = regexp(elements{i}, '([A-Z][a-z]?)(\d*)', 'tokens');
    element = element{1}{1};
    if isempty(numAtoms{1}{2})
        numAtoms = 1;
    else
        numAtoms = str2double(numAtoms{1}{2});
    end
    % Find the atomic weight of the element
    atomicWeight = atomicWeights(strncmpi(element, {'H', 'C', 'N', 'O'}, 1));
    % Add the contribution to the molecular weight
    molecularWeight = molecularWeight + numAtoms*atomicWeight;
end

disp(['The molecular weight of ' formula ' is ' num2str(molecularWeight) ' g/mol.'])
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