About Plotting in Mathcad Prime 9

In Prime you can plot one vector over another, but Prime only understands a vector to be a column vector, not a row vector.

Your function "calculate" returns five row vectors.

So I would suggest to use the transpose operator already at the end of function "calculate" so it returns column vectors and you also may assign the result of this function to a 1x5 matrix of meaningful variable (names) so you don't have to manipulate the result variable "plott" to access the individual vectors for plotting.

Prime 9 sheet attached

BTW, one of the strengths of Prime is that you can use units in a natural way so I would suggest that you add units to your calculations right from the start.

EDIT: I overlooked that in case 1 and 2 you only return two vectors and not five.

One way to cope with that could be a small program which replaces the non-existent vectors by zeros. That way they only show as a tiny dot at the left of the plot. We could replace the zero by a NaN, but this would result in a nasty red error in case 1 & 2.

Of course you could also already modify your function "calculate" so that it returns a 5x1 nested matrix in all cases.

Modified Prime 9 sheet attached