Minimal example :
x=[1:1:10]; y=sin(x); z=cos(x);w=tan(x);v=1./sin(x);
xlabel('x');
subplot(2,2,1)
ylabel('y')
plot(x,y,'-@')
subplot(2,2,2)
ylabel('w')
plot(x,z,'-@')
subplot(2,2,3)
ylabel('w')
plot(x,w,'-@')
subplot(2,2,4)
ylabel('v')
plot(x,v,'-@')
As soon as a ylabel command is issued after each subplot, the previous plot is
replicated in the new location. This creates a mess.
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