MATLAB: How to find first non repeated (unique) character in a string

first non repeatednon repeated charactersuniqueunique characters

I have already tried to find a Matlab function for this but doesnt seem to be one apart from 'unique' which only eliminates duplicates. Any ideas for code on how to do this?

For example, an input of 'hello' would return h or an input of 'radar' would return d.

The unique characters in 'hello' are h,e and o with h being the first in line

The unique character in 'radar' is only d and so this would also be the first

Any help would be appreciated

Best Answer

u=unique(s,'stable'); % where s is your input
Z=arrayfun(@(x)nnz(s==u(x)),1:numel(u));
Result=u(find(Z==1,1,'first'))

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MATLAB: How modifying the input of a function : from (unique) vector to matrix

You can always add a recursive call in case of a matrix input. Also, to keep your code understandable you should write a short block that describes the goal of the function and it's inputs and outputs. The rest of your function should have explanatory comments, so other people can understand it as well (future you is another person as well). As final remarks: don't ignore m-lint warnings (they are very useful), avoid lower-case L as a variable name (as it is easily confused with numeric 1 when reading), and very importantly: don't use your function name as the name of your output variable.

function shapley_output=shapley(player_weight, limit)
if size(player_weight,1)>1
    shapley_output=shapley(player_weight(1,:), limit);
    for n=2:size(player_weight,1)
        shapley_output(:,n)=shapley(player_weight(n,:), limit);
    end
    return
end
n = numel(player_weight);
C = generate_all_coalitions(n);
s = C*player_weight';
shapley_output = zeros(n,1);
for party = 1:n
    for k = 1:length(s)
        row = C(k,:);
        modrow = row;
        modrow(party) = 0;
        if row(party)
            if (row*player_weight' > limit && modrow*player_weight' <= limit)
                sizeT = sum(row);
                shapley_output(party) = shapley_output(party) + ...
                    factorial(sizeT - 1)*factorial(n-sizeT)/factorial(n);
            end
        end
    end
end
end
function [c] = generate_all_coalitions(n)
c = zeros(1,n);
for k = 1:(2^n-1)
    c(k+1,:) = convert_to_binary(k,n);
end
end
function [x] = convert_to_binary(n,max)
x = zeros(1,max);
for k = max-1:-1:0
    if n - 2^k >= 0
        n = n - 2^k;
        x(k+1) = 1;
    else
        x(k+1) = 0;
    end
end
end

MATLAB: Sort without duplicate

doc unique

The unique function find unique elements of vector

Best Answer

Related Solutions

MATLAB: How modifying the input of a function : from (unique) vector to matrix

MATLAB: Sort without duplicate

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