I have plotted y(t) vs x(t) in Mathcad prime. I added three functions on y, and on x. All functions of t. t is a new variable that has not been defined. The plot looked great. Then after making additional edits I notice one of the curves grayed out and Mathcad states that t on the x axis for that curve, is not defined. All the others are. To "fix" this I have to delete the eq and reenter it. Then the line is redrawn, exactly as before and in the color specified.
Can someone explain what I am doing wrong? I'm spending a lot of time going back and fixing stuff that once worked.
