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| Hi Antonio, Thanks for your hints. With Nest function I can get the result I was looking for, i.e. repeatedly expanding a expression to check if I get the right expression. [img=width: 585px; height:... |
| I have problem with instantializing a variable with subscript.[mcode]Subscript[a, i, j] = \!\( \*UnderoverscriptBox[\(\[Product]\), \(k = i\), \(j\)] \*SubscriptBox[\(a\), \(k\)]\); Subscript[a, i, j] /. {i -> 1, j -> 2} Subscript[a, 1,... |
| Wow! Thanks you very very much! These are exactly what I want![mcode]a = {ax, ay}; b = {bx, by}; ref1 = {x1, y1}; ref2 = {x2, y2}; Plus @@@ Tuples[{{a, b}, {ref1, ref2}}] Outer[Plus, {a, b}, {ref1, ref2}, 1]~Flatten~1 (* Result: {{ax + x1, ay... |