I am using the ilaplace command from matlab and it keeps spitting out the dirac delta function. I typed the exact command in the matlab help section and it still gives me this. for example I type in this... ilaplace(1/(s-1)) and I get this... 1 - dirac(t) below is a copy of matlab help file that has this exact command with the result I'm after. Examples: syms s t w x y ilaplace(1/(s-1)) returns exp(t) Any help would be great. I'm thinking it is some format command or something beforehand.