Wikipedia:Reference desk/Archives/Mathematics/2012 March 29

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March 29

math onto graphmatica

How to insert an equation like y=2-3 with the exponent 2 above 2, and y=5 to the power of x+3 and y=2 to the power of 2x-1 onto the program Graphmatica? — Preceding unsigned comment added by 70.31.20.138 (talk) 19:50, 29 March 2012 (UTC)

I haven't used graphmatica, but the usual way is to add parentheses, like this: y=5^(x+3). That works on Wolfram alpha, for instance. 130.76.64.118 (talk) 21:40, 29 March 2012 (UTC)

A notation for Hadamard product

I was curious if anyone knew of a common notation for the Hadamard product akin to capitol sigma notation for summation. That is, I need to denote the Hadamard product of $P_{i}$ over all i. Anyone seen something like this? Is there a common convention? Thanks, --TeaDrinker (talk) 19:54, 29 March 2012 (UTC)

$Q_{jk}=\Pi _{i}P_{ijk}$. Bo Jacoby (talk) 20:34, 29 March 2012 (UTC).

Ah sure, just describe the product pointwise; that would certainly work. Thanks, --TeaDrinker (talk) 21:32, 29 March 2012 (UTC)