Plot issues

Hello

I have a following simple code with two sine waves

t=[0:0.001:0.03];
x=10*sin(2*pi*50*t+10);
y=5*cos(2*pi*50*t-30);
plot(t,x,'bk-',t,y,'b.-')

I have two questions regardng the plot

1. Is there a way to print an index (1,2,3...) of a datapoint on the plot?
2. Is there a way on how to make the lines Bold or to increase thickness?
Plot help instruction do not work (or I am using it wrong). Any examples fro
both would be much appreciated.

Thanks



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