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Re: Solve problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg98027] Re: [mg97988] Solve problem
  • From: Adriano Pascoletti <adriano.pascoletti at dimi.uniud.it>
  • Date: Sat, 28 Mar 2009 05:43:06 -0500 (EST)
  • References: <200903271035.FAA25199@smc.vnet.net>

In[1]:= a1 /. Cases[{{b1 -> -2, a1 -> -1}, {b1 -> 0.5, a1 -> 3}},
     r : (a1 -> (i_)?Positive), Infinity]
Out[1]= 3
In[2]:= a1 /. Cases[{{a1 -> 1, b1 -> 3}}, r : (a1 -> (i_)?Positive),
Infinity]
Out[2]= 1


Adriano Pascoletti

2009/3/27 Bruno Campanini <BC at gmail.com>

> I have a Solve[...] which gives me solutions like
> {{b1 -> -2, a1 -> -1 }, {b1 -> 0.5, a1 -> 3}}
> or like
> {{a1 -> 1, b1 -> 3}}
>
> How can I get the positive value for a1, which is  3
> in the first case and  1  in the second one?
>
> Bruno
>
>



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