How to generate a Halfsine pulse?

Hi everyone, I would like to generate a halfsine pulse using this formula (f(t)=Fo sin(pit/T1), 0≤t≤T1; f(t)=0, T1<t. Can anyone help me? See page 3 on this link: http://scholar.lib.vt.edu/ejournals/MODAL/ijaema_v7n2/trethewey/trethewey.pdf. Urgent need please

t=0:0.001:4
T1=0.02
if t>=0 && t<=T1
    f(t)=sin(pi/Tc*t) 
else
    f(t)=0
end
F = f(t)

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/29922-why-your-question-is-not-urgent-or-an-emergency