My understanding is that in one of the plots you wish to have errorbars and in the other, you want to have some markers at the end points of an errorbar. You can use the "errorbar" function for the former and for the latter, you can create two additional vectors, "y+sigma" and "y-sigma", and plot them simultaneously. To ensure that just the markers show up, set the 'LineStyle' property to 'none'. You can experiment with marker styles. For the example code below, I am using the asterisk symbol as marker.
x = 0:pi/10:pi;
y = sin(x);
e = std(y)*ones(size(x));
figure
% errorbar(x,y,e)
plot(x,y)
y2 = y+e;
y3 = y-e;
hold on
plot(x,y2,'*','LineStyle','none')
plot(x,y3,'*','LineStyle','none')
I hope it helps!
