Dena - I suspect the error is due to the use of exp where you are not providing any inputs to this function. The code should probably be written as
x =inline('sin(2*pi*1*t).*(2*exp(-.1*t))','t');
instead (note the change of the brackets and the replacing of '.' with '.*' between the two expressions - is this correct?). But do you need to use an inline function? Could the recommended anonymous function be used as an alternative?
>> f = @(t)sin(2*pi*1*t).*(2*exp(-.1*t));
>> t = 1:10;
>> result = f(t);
