simple numerical calculation with variables -need help-

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simple numerical calculation with variables -need help-

Techniker
Hello to everyone.

First, I`m glad that I found this forum. Since a few days i try to make some simple numerical calculations with variables.

For example:

store 10 x
store 5 y
store eval    storedVars['x']-storedVars['y']     Z
echo ${Z}

then, I recieve a error in the log: NaN.

Could anybody give me an example for a numerical calculation please.

Best wishes fom the northern part of germany.

Techniker