Huhu,

Thank you for all you guys. readline works.

I hope R can be more and more powerful to deal with strings.

Thank you so much;
Zhou

2010/4/14 Erik Iverson <eriki@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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