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# definition variable name containing variables

## definition variable name containing variables

(OP)
Anyone know of a workaround so a definition name can contain undefined variables? I'm attempting to have a user input a ratio and have the variable name appear as the ratio of the two previously undefined variables (i.e. Mn/Op := ___ , Mn and Op undefined). Mathcad gives the error that Mn and Z aren't defined, as expected. Any insights are appreciated.

### RE: definition variable name containing variables

(OP)
Should read "... Mn and Op aren't defined ..."

### RE: definition variable name containing variables

so, make it a function of Mn and Op.

### RE: definition variable name containing variables

Don't try to fool mother nature.  I tried to define roughness over diameter as E/D and never got it to work.  I ended up with E_D and wondered why I tried to fight that battle.

There are a lot of valid ways to do it:

Ratiomn_Op
MN_OP
MNdividedByOP

Any of them would work good enough.

David

### RE: definition variable name containing variables

Oh, for that, you want:
Mn<CTRL><SHFT>k/<CTRL><SHFT>kOp, which will give you a variable name "Mn/Op" but, you'll need to do the same sequence each time, unless you just copy/paste the original entry.

Note, however, if Mn and Op are actually undefined, then you'll still get an error, since Mathcad will not allow you to define a non-function calculation with undefined variables in it.

### RE: definition variable name containing variables

(OP)
Well sounds like I'm SOL in this instance. zdas04, any of those would work well enough, but I needed the variable to visually appear like the table headers from which the ratio would be input. IRstuff, thank's for the <ctrl><shft>k trick. Too bad it can't override the undefined variables in the name. Thanks to both for the input.

### RE: definition variable name containing variables

Again, if you aren't adverse to defining
Mn/Op(Mn,Op):= function(Mn,Op) that would deal with the undefined variables.

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