Get rid of the lines that set t equal to linspace() inside the function and make the t be your vector. Assign it however you want, there are lots of ways and I don't know how you wanted to load up t. For example, you could assign linspace to t before you call the function, or read it in from a file, or get it from an Excel workbook, or get it from a uitable on the GUI, or however you want to do it. Then make sample_uniform_temperature_decrease() be a function that takes t as an argument:
function sample_uniform_temperature_decrease(t)
