[Swift-user] (no subject)

[Michael Wilde]

Also, I should clarify: the message:

"Compile error in procedure invocation at line 11: Wrong type for 
parameter number 0, expected file, got file[]"

is really referring to the expression in the assignment statement 
*within* the foreach.

Its complaining that you passed an object of data type "file[]" - i.e., 
"array of file" to a procedure whose corresponding argument was declared 
as expecting an object of data type "file" - i.e., a single scalar 
object of type "file".

The ability to pass an entire file[] array is a cool feature of Swift, 
but not what you wanted to do in this case.

- Mike


On 6/3/09 2:40 PM, Michael Wilde wrote:
> (Erin, please use good subject lines when sending to the list, as it 
> makes it easier to manage and find discussion threads)
> 
> The line:
> 
> foreach ix in frame {
>    output[ix] = rotate(frame, 180);  output[ix] = rotate(frame, 180);
> 
> should be:
> 
> foreach ix,i in frame {
>   output[i] = rotate(ix, 180);
> 
> or the inner statement can be:
>  output[i] = rotate(frame[i], 180);
> 
> Not sure, but you might be able to use simple_mapper for input mapping 
> as well. I'll leave you to experiment with that aspect for now.
> 
> - Mike
> 
> 
> On 6/3/09 2:11 PM, Hodgess, Erin wrote:
>> Hi Swift Users:
>>
>> I'm trying to collect all of the files with the extension ".jpg", 
>> rotate them 180 degrees, and produce output of "hoot.xxx.jpeg".
>>
>> here is my swift file and my error message.  I've tried lots of things 
>> with files and foreach, but I can't make any sense out of this.
>>
>> Any suggestions, please?
>>
>>
>>
>> [erin at tp-login2 swift1]$ cat rot2.swift
>> type file;
>>
>> app (file o) rotate(file s, int angle) {
>>    convert "-rotate" angle @filename(s) @filename(o);
>> }
>>
>> file  frame[] <filesys_mapper; pattern="*.jpg">;
>> file output[] <simple_mapper;suffix=".jpeg",prefix="hoot.">;
>>  
>> foreach ix in frame {
>>   output[ix] = rotate(frame, 180);
>> }  [erin at tp-login2 swift1]$
>> [erin at tp-login2 swift1]$ swift -tc.file tc.data rot2.swift
>> Could not start execution.
>>         Compile error in foreach statement at line 10: Compile error 
>> in procedure invocation at line 11: Wrong type for parameter number 0, 
>> expected file, got file[]
>>
>>
>> Thanks,
>> Erin
>>
>> Erin M. Hodgess, PhD
>> Associate Professor
>> Department of Computer and Mathematical Sciences
>> University of Houston - Downtown
>> mailto: hodgesse at uhd.edu
>>
>>
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