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  1. !! +var+ +exec+ +string+
  2. tit:recursion
  3. type:$type_both
  4. syntax:!recursion `fn' for `v'=`v1' to `v2' [step `st'], or <br/>\
  5. $ !recursion `fn' for `v' in `v1,v2,v3,...'
  6. mean:Computes the outcome of a recursion using the function `fn' in which the\
  7.  variable `v' is replaced successively by values `v1', ..., `v2'. <p>\
  8.   In the second syntax, the values are given with respect to each item in\
  9.   the list `v1,v2,...'. <p>\
  10.  The function `fn' should use the variable `last' to indicate the value of the previous \
  11.  recursion step. And the starting value can be put into the WIMS variable\
  12.  <span class="tt">$$recursion_start</span>. </p>
  13.