matrix dimensions incompatible problem.

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Hey, basic new guy question here, that I feel stupid even asking but I can't seem to find the answer or get my code to work. All I'm trying to do is define a time domain and then have matlab return an x value for each time increment in the time domain, according to a given formula:

t=linspace(0,3);

dampedx =(0.1*cos(10*t)+0.00025*sin(10*t))*exp(-0.0025*t);

The trig function part works, but it is the "exp(-0.0025*t)" term it seems to have an issue with. I tried using "t." instead of "t" because I'm trying to tell it for each value of t, calculate a corresponding value of x, but I think it is trying to do something funky with the entire array of values in t, because it keeps giving me some error about matrix dimensions.