I have something like:


and inside a \foreach I'm trying to define a new value for \radius to be half the size of the previous but using


isn't working...

Any sugestions on how to define a value recursively?


  • I assume you have to expand the old value first, but without seeing any code... – user31729 Sep 7 '16 at 13:04
  • A complete example of what you're doing would be nice, there might well be some other way of solving it. – Torbjørn T. Sep 7 '16 at 13:04
  • The \foreach macro supports the key remember which can be handy in this case; an example would be very useful. – egreg Sep 7 '16 at 13:32

Inside a foreach the code is scoped which means when one spin is completed the value returns to its original value. You can basically do a global let


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