(j3.2006) F2008: Bogus text in UDIO; IMAGE_INDEX question

[Micki St. James]

Which leaves only Tobias' last question, to which the answer is apparently "No, it returns 0 in the case that NUM_IMAGES() is less than 213."

What happens if 213 (but not 3, 1, or 2) is bigger than HUGE(0) ?

Micki

Sent from my iPhone

On Mar 28, 2011, at 11:49 AM, Bill Long <longb at cray.com> wrote:

> 
> 
> On 3/28/11 1:25 PM, Tobias Burnus wrote:
>> Hello all,
>> 
>> I have serious problems parsing the following sentence:
>> 
> 
> Not surprising.
> 
>> " , if contained a and the list item's corresponding edit descriptor was
>> a DT edit descriptor."
>> 
> 
> This looks like left over text from the same part of Fortran 2003 that was not removed when the first part of the sentence was edited.
> 
> 
>> Yes, the sentence starts with space-comma-space. See: F2008 (N1830),
>> "9.6.4.8.3 Defined input/output procedures", paragraph 13, last sentence
>> of the 3 bullet point (page 226).
>> 
>>   * * *
>> 
>> Secondly, I have a question regarding IMAGE_INDEX. One finds in the
>> standard:
>> 
>> "Result Value. If the value of SUB is a valid sequence of cosubscripts
>> for COARRAY, the result is the index of the corresponding image.
>> Otherwise, the result is zero.
>> Examples. If A and B are declared as A [0:*] and B (10, 20) [10, 0:9,
>> 0:*] respectively, IMAGE_INDEX (A, [0]) has the value 1 and IMAGE_INDEX
>> (B, [3, 1, 2]) has the value 213 (on any image)."
>> 
>> My question is: What meant by "valid sequence of cosubscripts"? Or in
>> other words: Will the second IMAGE_INDEX in the example always return
>> 213 or only if num_images()>= 213?
> 
> A set of cosubscripts is valid of each is within the cobounds for the corresponding codimension, and the last is small enough such that the result value is <= the number of images.   The relevant text is in 6.6 paragraph 2 (page 125):
> 
> The number of cosubscripts shall be equal to the corank of the object. The value of a cosubscript in an image selector shall be within the cobounds for its codimension. Taking account of the cobounds, the cosubscript list in an image selector determines the image index in the same way that a subscript list in an array element determines the subscript order value (6.5.3.2), taking account of the bounds. An image selector shall specify an image index value that is not greater than the number of images.
> 
> Cheers,
> Bill
> 
> 
> 
>> 
>> Tobias
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> 
> -- 
> Bill Long                                           longb at cray.com
> Fortran Technical Support    &                 voice: 651-605-9024
> Bioinformatics Software Development            fax:   651-605-9142
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