[R] R interactive input like C++

[Paul Hiemstra]

余舟 wrote:
> Huhu,
>
> Thank you for all you guys. readline works.
>
> I hope R can be more and more powerful to deal with strings.
>   
Strings and power come from regular expressions, check out ?regexpr.

cheers,
Paul
> Thank you so much;
> Zhou
>
> 2010/4/14 Erik Iverson <eriki at ccbr.umn.edu>
>
>   
>> David Scott wrote:
>>
>>     
>>> Erik Iverson wrote:
>>>
>>>       
>>>> ?? wrote:
>>>>
>>>>         
>>>>> Thank you for your reply.
>>>>>
>>>>> My objective is simple. Assume  I have a constant vector, say Vector. in
>>>>> C++ code, I want to do:
>>>>>
>>>>>
>>>>> int index;
>>>>> cout<<"Please enter the index of the element you want to look at Vector
>>>>> :";
>>>>> cin>>index
>>>>> cout<<Vector[index]
>>>>>
>>>>>
>>>>> I want every user to be able to do this.
>>>>>
>>>>> As I understand, scan can only read data from a fixed file. Can I just
>>>>> get the input from the shell directly?
>>>>>
>>>>>
>>>>>           
>>>> Isn't that what the file argument of ?scan says?  I think?
>>>>
>>>>     file: the name of a file to read data values from.  If the
>>>>           specified file is ‘""’, then input is taken from the keyboard
>>>>           (or whatever ‘stdin()’ reads if input is redirected or R is
>>>>           embedded).
>>>>
>>>>
>>>>         
>>> I think the required function is readline which prompts for user input.
>>>
>>> ?readline
>>>
>>>
>>>       
>> Great, didn't know that one.  The example in ?readline is hilarious.
>>
>>     
>
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>
>   
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-- 
Drs. Paul Hiemstra
Department of Physical Geography
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