Greetings. I'm new to COMSOL and am in the stage where I know what I want done, but I just can't get the software to do it. Suppose I model out a metal spring, and fix one end of it in place. I want to pull on the other end, and then plot some value relevant to the deformation of the spring. Right now, I can input one value as a constraint in the boundary settings, and that works fine. I get my deformation value, but it's slow and tedious to plug in one value at a time, and wait for the solution. What I want to do is have COMSOL do this for a range of values, and then plot the resulting values. I know it's possible to put in an expression containing variables in the constraint box, but I can't get it to work. I hope this is an easy question to answer, thanks for helping a newbie out.