no defined variables and redefing them?

[AM_11312647]

Hello,
i am currently making a calculation with Mathcad Prime 9.0, where i got 3 different load cases and i want them all in 1  sheet.

i made a few formulas at the beginning, and will later calculate my loadcases with them. For that i wanted some variables to be empty, so that they will just shown as their variable name, so i can later change this variable in every load case to a different number.

1. When i just use a non defined variable, the whole formula cant used further
2. When i give the variable a value and change it later, it will not recalculate the formula with the updated variable.

Is there a Solution for this? Or is this just how Mathcad works?

[ttokoro]

Attach your worksheet. Usually, it is no problem.

[LucMeekes · Accepted solution]

Instead of mere 'formulas', you should use functions.

So instead of

which requires m and a to be numerically defined, before F can be calculated, (hence the red error mark)

use:

Where you can fill in the numbers for m and a once you're ready to calculate the corresponding value of F.

And you can calculate the results for a set of scenarios:

Success!
Luc