absolute value extracting to a coordinate

[allenp]

I would like to have a variable which is negative by default so I can either choose to use it like that, or to use its absolute value when needed but I dont want to add another variable for its absolute value counterpart and i dont know how to do it without it.

for example If i got variable:
#100=-20.;

then I have to add another variable:
#101=ABS#100;

to have both values and then I can choose to use:
X#100 or X#101, but when I try to use

XABS#100
it doesnt work.
or
X[ABS#100]
doesnt work
or
X[ABS(#100)]
it doesnt work
or
X[ABS[#100]]
it doesnt work.

is there a way to do this?
thanks.

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[rcs60]

#100=-20.
#101=20.

XABS#100
it doesnt work.
or
X[ABS#100]
doesnt work
or
X[ABS(#100)]
it doesnt work
or
X[ABS[#100]]
it doesn't work.

all these are #101
X#101 would be the same if you are trying to do something we need more information

[allenp]

sorry it worked with
X[ABS#101]
I dont know how i missed it so the topic can be closed
thanks.