# Two Stem Plots with Different Base Values on the Same Graph

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Chien-Cheng Chiu on 18 Sep 2020
Answered: Dan on 5 Nov 2020
I want to plot two stem plots on the same graph so that "stem1" has a base value at 0 and "stem2" has a base value at -y_shift = 1. However, when I run the code, "stem1" would start on a base value at 0 for some time before its base value at 0 changes to the same base value as "stem2" and stays at the base value of -1. Is there any way to prevent that from happening?
for k = 1:10:m % for faster animations i.e. skip frame
z0 = u_approx_dirac(k,:);
z1 = dirac(k,:);
clf
hold on
plot(x, zeta(x), 'r');
plot(x_dirac , z0 , 'k');
stem1 = stem(x (z1 ~= 0), z1 (z1 ~= 0), 'filled', 'k');
set(stem1, 'LineWidth', 2, 'BaseValue', 0, 'ShowBaseLine', 'off');
time = t(1:2:k);
ref = reflectedwave(y(1:2:k));
dirac_ref = dirac_reflectedwave(y(2:2:k));
plot(time, ref - y_shift, 'b');
stem2 = stem(time (dirac_ref ~= 0), dirac_ref (dirac_ref ~= 0) - y_shift, 'filled', 'b');
set(stem2, 'BaseValue', -y_shift, 'ShowBaseLine', 'off');
legend(sprintf('t = %.6f', t(k)));
grid on
xlim([c d]);
xlabel('x');
ylim([-2 5]);
pause(0.00001);
hold off
frame = getframe(gcf);
writeVideo(v, frame);
end
close(v);

Dan on 5 Nov 2020
It seems that all the stem plots on the same axes are beholden to a common basevalue. This is step back from earlier versions of MATLAB ... to show two basevalues on the same axes, you can lay two axes on top of one another:
figure;
x = axes;
ylim([0,21])
xlim([0,11])
hold on
a=stem(1:10,'basevalue',10);
hold on
y = axes('position',x.Position);
ylim([0,21])
xlim([0,11])
set(y,'Color', 'none')
hold on
b=stem(11:20,'basevalue',20);
To get this plot: R2020b

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