Meaning of “tmp$xxxx” in Mathematica output?

Your code probably has a variation of this problem: fx_ := Module{t}, Cost+Cosx at which point evaluating this: fy gives this: Cost$685 + Cosy Often, this means there is a problem with the code Either 't' was meant to be passed in as a parameter of 'f': fx_,t_ := Module{}, Cost+Cosx or 't' needed to be initialized in some fashion: fx_ := Module{t}, t=2x; Cost+Cosx It's perfectly ok to use these unique variables in your code, if you intend to do so. For example, this is one way to write an expression with with many unique variables: Plus @@ TableUniquex^i, {i, 100}.

Your code probably has a variation of this problem: fx_ := Module{t}, Cost+Cosx at which point evaluating this: fy gives this: Cost$685 + Cosy Often, this means there is a problem with the code. Either 't' was meant to be passed in as a parameter of 'f': fx_,t_ := Module{}, Cost+Cosx or 't' needed to be initialized in some fashion: fx_ := Module{t}, t=2x; Cost+Cosx It's perfectly ok to use these unique variables in your code, if you intend to do so. For example, this is one way to write an expression with with many unique variables: Plus @@ TableUniquex^i, {i, 100}.

You are most likely seeing localized symbols that result through scoping such as Module. Here is one example. Since the localized symbol x is used to define the global symbol y the temporary symbol x$152 escapes Module.

In1:= Module{x}, y = x; y Out2= x$152 There are other variations of this process. Suppose you set a unique context for the cell (Evaluation > Notebook's Default Context > Unique to Each Cell Group) and then make an assignment to an explicitly Global symbol: Global`b = a Now in another notebook: In1:= be Out1= Notebook$$33`a.

1 +1, for "escapes Module. " I hate it when variables chew through their restraints ... – rcollyer Nov 10 at 14:44.

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