I don't know what is wrong with my code when recreating a table

There's this table I need to create, in which, depending on the time(t), the value of Clo and Met changes. My code is:

t = 0:0.5:24;

for i = 0:0.5:24
    if t(i)>=0 && t(i)<8
        Clo = 3;
        Met = 0.4;
    end
    if t(i)>=8 && t(i)<12
        Clo = 1;
        Met = 1;
    elseif t(i)>=12 && t(i)<17
        Clo = 0.5;
        Met = 1.6;
    elseif t(i)>=17 && t(i)<22
        Clo = 1;
        Met = 0.9;
    elseif t(i)>=22 && t(i)<24
        Clo = 2.5;
        Met = 0.4;
    else
        plot(t,Clo,'g');
        xlabel ('Time (hours)');
        ylabel ('Clo');
    end
end

Answer 1

[Subhadeep Koley]

loop indices must be positive integers or logical values. In your code, you're trying to use fraction values as index. Also, your plot command is inside an else branch. The below modifications might help.

t = 0:0.5:24;
Clo = zeros(size(t));
Met = zeros(size(t));
for idx = 1:numel(t)
    if t(idx)>=0 && t(idx)<8
        Clo(idx) = 3;
        Met(idx) = 0.4;
    elseif t(idx)>=8 && t(idx)<12
        Clo(idx) = 1;
        Met(idx) = 1;
    elseif t(idx)>=12 && t(idx)<17
        Clo(idx) = 0.5;
        Met(idx) = 1.6;
    elseif t(idx)>=17 && t(idx)<22
        Clo(idx) = 1;
        Met(idx) = 0.9;
    elseif t(idx)>=22 && t(idx)<=24
        Clo(idx) = 2.5;
        Met(idx) = 0.4;
    end
end
plot(t, Clo,'g')
xlabel ('Time (hours)')
ylabel ('Clo')

figure
plot(t, Met,'r')
xlabel ('Time (hours)')
ylabel ('Met')

[Sarah Kneer]

Okay thank you very much. I appreciate it a lot.

[Sarah Kneer]

I don't know why but the plots are completely empty which I wasn't expecting.

[Subhadeep Koley]

@Sarah Kneer Are you executing the exact script as mentioned in the answer? I'm getting output in my end (refer the attached image) with that script.

[Stephen23]

Works for me, copied verbatim:

t = 0:0.5:24;
Clo = zeros(size(t));
Met = zeros(size(t));
for idx = 1:numel(t)
    if t(idx)>=0 && t(idx)<8
        Clo(idx) = 3;
        Met(idx) = 0.4;
    elseif t(idx)>=8 && t(idx)<12
        Clo(idx) = 1;
        Met(idx) = 1;
    elseif t(idx)>=12 && t(idx)<17
        Clo(idx) = 0.5;
        Met(idx) = 1.6;
    elseif t(idx)>=17 && t(idx)<22
        Clo(idx) = 1;
        Met(idx) = 0.9;
    elseif t(idx)>=22 && t(idx)<=24
        Clo(idx) = 2.5;
        Met(idx) = 0.4;
    end
end
plot(t, Clo,'g')
xlabel ('Time (hours)')
ylabel ('Clo')

figure
plot(t, Met,'r')
xlabel ('Time (hours)')
ylabel ('Met')

[Sarah Kneer]

I got it know, I missed the (i) after Clo and Met. Thanks.

[Peter Perkins]

It's also worth noting that the loop in this code is unnecessary:

t = 0:0.5:24;
Clo = zeros(size(t));
Met = zeros(size(t));
i = t>=0 & t<8
Clo(i) = 3;
Met(i) = 0.4;
i = t>=8 && t<12
Clo(i) = 1;
Met(i) = 1;
i = t>=12 && t<17
Clo(i) = 0.5;
Met(i) = 1.6;
i = t>=17 && t<22
Clo(i) = 1;
Met(i) = 0.9;
i = t>=22 && t<=24
Clo(i) = 2.5;
Met(i) = 0.4;