How to plot loop items on legend

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Joshua Tshuma
Joshua Tshuma 2022-4-4
评论： Voss 2022-4-5
Hi,
I've got a loop that uses values in a list (fRat) in each iteration. The output of the code is as expected, but I want to make sure the legend shows me which curve corresponed to which iteration value in the list. So far it's only giving me the last list item value i.e., 0.3.
I've attached the code.
Also, if i move the %plotting block from where it is now, it'll again only output one curve - the last one.
I look forward to your advice and/or feedback.
Thanks.
%range
x = 50:1000;
TL = zeros(length(x), 1); % memory pre-allocation
for fRat = [0.1, 0.15, 0.3] %list
for j = 1:length(x)
%code
%TL - desired output function
end
%plotting
y = real(TL);
semilogx(x, y)
hold on
legend(strcat('p=', num2str(fRat)))
xlabel("Frequency (Hz)")
ylabel("Transmission loss (dB)")
end

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采纳的回答

Voss
Voss 2022-4-4
Ran in:
%range
x = 50:1000;
TL = zeros(length(x), 1); % memory pre-allocation
fRat_all = [0.1, 0.15, 0.3];
% pre-allocate line handles:
h_line = zeros(1,numel(fRat_all));
for ii = 1:numel(fRat_all) %list
fRat = fRat_all(ii);
for j = 1:length(x)
%code
%TL - desired output function
TL(j) = ii+0.25; % some different TL values, so the lines are different
end
%plotting
y = real(TL);
% store this line as h_line(ii):
h_line(ii) = semilogx(x, y);
hold on
end
legend(h_line,sprintfc('p=%.2f',fRat_all)); % use all lines and all fRat values in legend
xlabel("Frequency (Hz)")
ylabel("Transmission loss (dB)")

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