How to call n numbers from a Matrix

Question

Rose Vogt 2020-11-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/663003-how-to-call-n-numbers-from-a-matrix

回答： KSSV 2020-11-26

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?

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Answer 1

KSSV 2020-11-26

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/663003-how-to-call-n-numbers-from-a-matrix#answer_556468

在 MATLAB Online 中打开

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)');