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The value returned by the BTRAN function is a (jn) ×(im) matrix, the block tranpose of x, where the blocks are n ×m.
For example, the statements
proc iml; z=btran({1 2 3 4, 5 6 7 8},2,2); print z;produce the result
Z 4 rows 2 cols (numeric) 1 2 5 6 3 4 7 8
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