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## Compare two revisions of: RandadjustIf

 ... ... @@ -1,11 +1,13 @@ 1 1 {{TOC}} 2 2 3 3 Random variables can be adjusted to satisfy a specific constraint.
4 -For example we might adjust the variable x to be always greater than the variable y.
4 +For example we might adjust the variable x to be always greater than the variable y by using 5 +the command \randadjustIf{x,y}{x<=y}
5 6 6 7 The command \randadjustIf has the syntax \randadjustIf{[varlist]}{[relation]} . 7 8 * **varlist** comma separated list of variables to be adjusted 8 -* **relation** a relation that defines an avoidance condition under which the variables in varlist should be adjusted 9 +* **relation** a relation that defines an avoidance condition under which the variables 10 +in varlist should be adjusted. 9 11 10 12 LaTeX 11 13 \begin{question} ... ... @@ -22,6 +24,24 @@ The command \randadjustIf has the syntax \randadjustIf{[varlist]}{[relation]} 22 24 \end{question} 23 25  24 26 27 +The avoidance_relation has to be a logical (boolean) combination (use $$NOT$$, $$AND$$, $$OR$$) of simple comparison 28 +relations $$(=, !=, <, <=, >, >=)$$ between **expressions** in the variables. 29 + 30 +These expressions may include **random and non-random** variables defined in the same variable 31 +environment. 32 + 33 +See [Expressions And Relations](Expressions-And-Relations.md#relations-usable-in-randadjustif) 34 +for a more detailed description. 35 + 36 +*Hint*: 37 + 38 +* Make sure that the avoidance relation can be avoided at all for the random variables with the ranges given. 39 +The \randint commands jointly define a product set which has to have a non-empty intersection with the 40 +complement of the avoidance set. Otherwise you get a runtime error when the problem is run. 41 +* Even if the intersection is non-empty but has a equi-distribution probability being too small, 42 +a runtime error might be the result, though the algorithm tries its best to find an admissible point. 43 + 44 + 25 45
26 46 \randadjustIf on a variable defined by \drawFromSet only works for (the default) type _number_ 27 47
... ... @@ -71,4 +91,6 @@ You may use \randadjustIf` in the same 71 91 manner as explained above, also multiple times for disjoint sets of global variables. You should *NOT* adjust 72 92 global variables within a question, but only in the problem environment where they are defined. 73 93 74 -[Alternatively use a switch/case statement](Switch-Case-Statement) 94 +[Alternatively use a switch/case statement](Variables.md#switchcase-statements) 95 + 96 + 75 97