Hello,
I understand that you are trying to collect coefficients of a symbolic expression in MATLAB and order them by a specific variable, in this case, "K". You can achieve this by combining the "collect" and "coeffs" functions and then manually sorting the coefficients.
You can refer to the example below:
% extract coefficients of K
[coeffs_K, terms] = coeffs(D_collected, K);
% initialize a cell array to store coefficients sorted by the power of K
powers = arrayfun(@(term) double(feval(symengine, 'degree', term, K)), terms);
% extract the power of K from each term and sort the coefficients by the power of K
[~, sorted_indices] = sort(powers, 'descend');
sorted_coeffs = cell(1, length(terms));
% store the sorted coefficients
for i = 1:length(sorted_indices)
sorted_coeffs{i} = coeffs_K(sorted_indices(i));
end
The above code will give you a cell array "sorted_coeffs" where the coefficients are sorted by the power of "K".
You can refer to the below documentation to learn more about MATLAB's Symbolic Toolbox. Also, please refer to the documentations for the "collect", "coeff", "arrayfun" and the "feval" functions in MATLAB.
