how to add to matrix in a loop rather than replace

I like to use the following codes to put members in groups. But as you can see Alkanes are replaced not added up.

species{1}=[0.86 1.27 1.23]; species{2}=[1.4]; species{3}=[4.32 3.49 1.33 1.02 0.83]; species{4}=[8.87 6.89 6.78 6.74 6.72 3.73];

type{1}=['aliohatic' 'aliphatic' 'aliphatic']; type{2}=['cycloalkene']; type{3}=['aliphaticOH' 'alcoholethyl' 'aliphatic' 'aliphatic' 'aliphatic']; %13=aliphaticOH %14=alcoholethyl type{4}=['ArOH' 'aromaticH' 'aromaticH' 'aromaticH' 'aromaticH' 'ArOCH3'] %15=ArOH %16=aromaticH %17=ArOCH3

for iC=1:4 if ismember('ArOH', type{iC}) parent{iC}='Phenols' Phenols=species{iC}

        elseif ismember('aliphaticOH', type{iC})
        parent{iC}='Alcohols'
        Alcohols=species{iC} 

        elseif ismember('cycloalkene', type{iC}) 
            parent{iC}='Alkanes'

        elseif ismember('aliphatic', type{iC}) 
            parent{iC}='Alkanes'
            Alkanes=species{iC}

        else
            parent{iC}='unknown'         
        end
end

Answer 1

[BhaTTa]

Hey @Jaber Gharib, in the code you have provided each time when you see a match you are overrding previous value instead of appending it, below i have attached an similiar example where I will be appending the values

species{1} = [0.86 1.27 1.23];
species{2} = [1.4];
species{3} = [4.32 3.49 1.33 1.02 0.83];
species{4} = [8.87 6.89 6.78 6.74 6.72 3.73];
species{5} = [8.87 6.89 6.78 6.74 6.72 3.73];

type{1} = {'aliphatic', 'aliphatic', 'aliphatic'};
type{2} = {'cycloalkene'};
type{3} = {'aliphaticOH', 'alcoholethyl', 'aliphatic', 'aliphatic', 'aliphatic'};
type{4} = {'ArOH', 'aromaticH', 'aromaticH', 'aromaticH', 'aromaticH', 'ArOCH3'};
type{5} = {'ArOH', 'aromaticH', 'aromaticH', 'aromaticH', 'aromaticH', 'ArOCH3'};
% Initialize group variables
Phenols = [];
Alcohols = [];
Alkanes = [];

for iC = 1:5
    if ismember('ArOH', type{iC})
        parent{iC} = 'Phenols';
        Phenols = [Phenols, species{iC}];
    elseif ismember('aliphaticOH', type{iC})
        parent{iC} = 'Alcohols';
        Alcohols = [Alcohols, species{iC}];
    elseif ismember('cycloalkene', type{iC})
        parent{iC} = 'Alkanes';
        Alkanes = [Alkanes, species{iC}];
    elseif ismember('aliphatic', type{iC})
        parent{iC} = 'Alkanes';
        Alkanes = [Alkanes, species{iC}];
    else
        parent{iC} = 'unknown';
    end
end

% Display results
disp('Phenols:');
disp(Phenols);
disp('Alcohols:');
disp(Alcohols);
disp('Alkanes:');
disp(Alkanes);

Hope it helps.