How to store data in double for-loop?

I have created a double for-loop. The outer one is for 5 subjects. The inner loop is for 3 measurements.

for welke_pp = 1 : aantal_pp
  switch welke_pp
    case 1
    case 2
    case 3
    case 4
    case 5
      
  end
  for i_testen = 1 : length(data_stair_rise)
    % to calculate 'Heup_hoek', 'Heup_hoek_afg' and 'Gemiddelde_gewrichtshoek'
    Heup_hoek = data_sts(welke_pp,i_testen).VideoSignals(:, strcmp('RHipAngles', data_sts(welke_pp,i_testen).VideoSignals_headers));
    Heup_hoek_afg{i_testen} = Heup_hoek(1:Afg_c_RASI(2,1));
    % I can store 'Gemiddelde_gewrichtshoek' for 3 measurements (=i_testen).
    Gemiddelde_gewrichtshoek.Heuphoek.meting(i_testen) = mean(Heup_hoek_afg{1, (i_testen)});
  end
end

How can I store the 3 measurements for EACH subject, and not for only 1 subject?

Answer 1

[Image Analyst]

Use two indices:

Gemiddelde_gewrichtshoek.Heuphoek.meting(i_testen, welke_pp) = ...