Reading the rules from a file, how can I convert the strings to such
anonymous functions?
On Tuesday, April 26, 2016 at 6:48:21 PM UTC+2, Josh Langsfeld wrote:
>
> Maybe a better design would be to store the rules as anonymous functions
> rather than code strings? Something like:
>
> ```
> rules = [(x -> x[1] && x[2]), (x -> x[3] || x[4])] #parentheses not
> required
> result = [rule(boolList) for rule in rules]
> ```
>
> On Tuesday, April 26, 2016 at 12:09:33 PM UTC-4, Ali Rezaee wrote:
>>
>>
>> Thanks for your replies.
>> My objective is exactly what the code shows. I have a list of Boolean
>> expressions similar to the examples in the code, and I need to evaluate
>> them one by one based on x values.
>> So writing a macro would be the only solution.
>>
>> Best regards
>> On Tuesday, April 26, 2016 at 5:38:21 PM UTC+2, Ali Rezaee wrote:
>>
>>> Hi everyone,
>>>
>>> I am trying to run the code below. When I try the code outside of a
>>> function and in REPL, it runs successfully. However when I run it using a
>>> function it throw an error.
>>> Why do I get the error? and how can I solve this problem?
>>>
>>> Thanks in advance for your help.
>>>
>>> rules = ["(x[1] && x[2])", "(x[3] || x[4])"]; # a list of boolean
>>> expressions
>>> boolList = [false, true, false, true]; # a boolean vector for every x
>>> in rules
>>>
>>> function evaluate(rules, boolList)
>>> x = boolList
>>> result = Array{Bool}(length(rules))
>>> for (i, rule) in enumerate(rules)
>>> result[i] = eval(parse(rule))
>>> end
>>> return result
>>> end
>>>
>>> evaluate(rules, boolList)
>>> # ERROR: UndefVarError: x not defined
>>>
>>> # but This will work:
>>> x = boolList
>>> result = Array{Bool}(length(rules))
>>> for (i, rule) in enumerate(rules)
>>> result[i] = eval(parse(rule))
>>> end
>>>
>>> result
>>> # 2-element Array{Bool,1}: false true
>>>
>>>
>>>
