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Re: problem with"Re" syntax

  • To: mathgroup at
  • Subject: [mg116810] Re: problem with"Re" syntax
  • From: "Sjoerd C. de Vries" <sjoerd.c.devries at>
  • Date: Tue, 1 Mar 2011 05:21:26 -0500 (EST)
  • References: <ikan2k$cdr$>

The problem is not Re. It's that Mathematica assumes that your a, b, g
and h functions may be complex valued. If that's not the case then you
could use ComplexExpand to say so:


g[0][t] g[1][t] + Sqrt[2] g[1][t] g[2][t] + Sqrt[3] g[2][t] g[3][t] +
 2 g[3][t] g[4][t] + Sqrt[5] g[4][t] g[5][t] - h[0][t] h[1][t] -
 Sqrt[2] h[1][t] h[2][t] - Sqrt[3] h[2][t] h[3][t] -
 2 h[3][t] h[4][t] - Sqrt[5] h[4][t] h[5][t]

Cheers -- Sjoerd

On Feb 26, 12:10 pm, tarun dutta <tarundut... at> wrote:
> c[i_][t] = a[i][t] + I*b[i][t];
> d[i_][t] = g[i][t] + I*h[i][t];
> del = Together[Sum[Sqrt[i]*d[i - 1][t]*d[i][t], {i, 0, 5}]]
> Re[del]
> the problem is that after executing the program, as output I am not
> able to get only the real part of the expression(del).the output
> contains the whole expression though i am using "Re" term.
> some valuable insight will be much appreciated.
> regards,
> tarun

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