[Swift-devel] loops and strings

[Veronika Nefedova]

I need to 'cat' together an unknown number of strings to form a  
string, thats why I was attempting to do it inside the loop. And even  
if I knew the number of loop cycles (say, its 68) -- are you  
suggesting  to do it 'by hand' ?


Anyway - my main goal is not to create this string, but to map an array:
file whamfiles_$s[] <fixed_array_mapper;files="$wham_string">;

Do you see a solution here?

Thanks,

Nika


On Jul 27, 2007, at 11:01 AM, Mihael Hategan wrote:

> wham_string2 = @strcat(wham_string, ", wham");
> print(wham_string2);
>
> Variables are not variables. They are labels that are used to  
> direct the
> data flow. Loops (in the sense of data looping around the same node -
> picture this as a data flow graph) make no sense.
>
> On Fri, 2007-07-27 at 10:50 -0500, Veronika Nefedova wrote:
>> So how else then I construct a string in swift ?
>>
>>
>> On Jul 27, 2007, at 10:46 AM, Mihael Hategan wrote:
>>
>>> Variables in swift are single assignment. You can't assign to a
>>> variable
>>> twice. What, in your opinion, should the error message be instead
>>> of the
>>> current one?
>>>
>>> On Fri, 2007-07-27 at 10:22 -0500, Veronika Nefedova wrote:
>>>> I am not sure if its possible to do string operations inside the  
>>>> loop
>>>> in swift?
>>>> I have a versy simple test code that doesn't work no matter what.
>>>> Obviously, I am missing something.
>>>> This is the code:
>>>>
>>>> file fls[]<filesys_mapper;pattern="*.prt",location=".">;
>>>> string wham_string = "#";
>>>> foreach prt_file in fls
>>>> {
>>>>        wham_string = @strcat (wham_string, ", wham");
>>>>        print (wham_string);
>>>> }
>>>> print (wham_string);
>>>>
>>>>
>>>> basically I expect to have this as an output:
>>>> #,wham,wham,wham,wham,... (its a test code (-;)
>>>>
>>>> instead I have these errors:
>>>>
>>>> wham_string is already assigned with a value of #
>>>> wham_string is already assigned with a value of #
>>>>          vdl:assign @ test.kml, line: 46
>>>>          vdl:mains @ test.kml, line: 39
>>>> Caused by: java.lang.IllegalArgumentException: wham_string is  
>>>> already
>>>> assigned with a value of #
>>>>          at org.griphyn.vdl.mapping.AbstractDataNode.setValue
>>>> (AbstractDataNode.java:255)
>>>>          at org.griphyn.vdl.karajan.lib.Assign.function
>>>> (Assign.java:70)
>>>> <snip>
>>>>
>>>>
>>>> In any case -- if I can't construct the string by using the loop -
>>>> how else could it be done?
>>>>
>>>> I use the constructed string then to map an array (I understand I
>>>> can't map individual array elements):
>>>>
>>>> file whamfiles_$s[] <fixed_array_mapper;files="$wham_string">; //it
>>>> was in the wrapper script before)
>>>>
>>>>
>>>> Nika
>>>>
>>>> _______________________________________________
>>>> Swift-devel mailing list
>>>> Swift-devel at ci.uchicago.edu
>>>> http://mail.ci.uchicago.edu/mailman/listinfo/swift-devel
>>>>
>>>
>>
>