how to sum first 140 elements every time in an (1 * 21000) array
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a=rand(1,21000);
how to add (1 to 140,141 to 280, 281 to 420........elements up to 20861 to 21000. and totally i have 21000/140=150 i.e (1row * 150 columns)
and store it in same 'a'
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