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
>>
>>
>>
