a | intent(inout) An array descriptor for the data to be
processed. On the destination image(s) the result overwrites the old content.
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result_image | intent(in) The ID of the image to which the
reduced value should be copied to; if zero, it has to be copied to all images.
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stat | intent(out) Stores the status STAT= and may be NULL.
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errmsg | intent(out) When an error occurs, this will be set to
an error message; may be NULL.
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a_len | intent(in) the string length of argument a
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errmsg_len | intent(in) the buffer size of errmsg
|