# How to call n numbers from a Matrix

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Rose Vogt on 26 Nov 2020
Answered: KSSV on 26 Nov 2020
watlevel(n)=[1.8; 1.5; 1.2; 1.3; 1.4; 1.6; 1.7; 1.4; 1.1; 0.9; 0.2; 0.2]; %incoming water level
time(n)=[0; 3; 6; 9; 12; 15; 18; 21; 24; 27; 30; 45; 50]; %time
for i=1:100:3000
Time2=i;
Volume2=(watlevel(n).*B1.*B2.*(time(n+1)-time(n)))-(watlevel(1).*B1.*B2.*(time(n+1)-time(n)).*Time./(50.*60));
plot(Time2,Volume2,'ks','MarkerFaceColor','k');
xlabel('Time (sec)'); ylabel('Volume (m^3)');
end
I am trying to call the specific "n" values from my matrix to use in my for loop but I'm not sure how. Does anybody know how to make this work?

KSSV on 26 Nov 2020
watlevel=[1.8; 1.5; 1.2; 1.3; 1.4; 1.6; 1.7; 1.4; 1.1; 0.9; 0.2; 0.2]; %incoming water level
time=[0; 3; 6; 9; 12; 15; 18; 21; 24; 27; 30; 45; 50]; %time
Volume2 = zeros(1,length(time)-1) ;
for n=1:length(time)-1
Volume2(n)=(watlevel(n).*B1.*B2.*(time(n+1)-time(n)))-(watlevel(1).*B1.*B2.*(time(n+1)-time(n)).*Time./(50.*60));
end
plot(time(1:end-1),Volume2,'ks','MarkerFaceColor','k');
xlabel('Time (sec)'); ylabel('Volume (m^3)');