After lengthy calculations I sometimes wish to show the variables that affect my numbers. I attached a small example. Besides showing the power P numerically, I would like to display P=a^2mt. How do I achieve this?

Thank you, while this works in this short example it is not feasible in real world calculations:

1. Engineering calculations usually start with the inputs (constraints), output is at the end. In an extended calculation that is several pages long you can't define all the calculations at the beginning and then just fill the variables.
   
2. This example does not work if you have any loops or if statements in between.
   

Are there other means to optimize symbolically without putting figures?

This is a step towards the right direction. Again, however :-)

1. Your file does not work for me. If I choose sym, I get "a not defined" in the last line P:= I am using the portable version and everything seems to be up to date.
   
2. The usage of a function drastically decreases the readibility of the sheet.
   
3. It is not efficient. I have to put every variable definition in the ugly function just to display one line symbolically.
   
4. You probably didn't mean g_e but g
   

I do not think a global switch is the thing an average engineering user wants. The purpose is to show the dependibility. So only for a selected number of results I want the numerical result and the symbolical result just close to each other. If you define 20 variables and make long calculations you would like to know which variables affect the numerical result and which ones don't.