Maxima assumes that variables are real by default. declare([*var1,
var2...*],complex)
declares those particular variable to be complex, which means that they *
might* have a non-zero imaginary part.
-s
On Tue, Apr 2, 2013 at 1:02 PM, Thomas D. Dean <tomdean at speakeasy.org>wrote:
> On 04/01/13 16:00, Robert Dodier wrote:
>
>> On 2013-04-01, Thomas D. Dean <tomdean at speakeasy.org> wrote:
>>
>>>
>>> for i:1 thru length(eq3) do if imagpart(eq3[i]) then plteq:eq4[i];
>>>
>>
>> I haven't looked at this carefully, but maybe you meant to write
>>
>> for i:1 thru length(eq3) do if imagpart(rhs(eq3[i])) = 0 then
>> plteq:eq4[i];
>>
>
> eq3 is a list of the form [x=..., x=..., x=...] so
>
> imagpart(eq3[2]); /* for example, */
> returns 0 = 3*sqrt(7)/4
> and
> imagpart(eq3[3]);
> returns 0 = 0
>
> I believe imagpart(x) is zero when x is not assigned. Is this always true?
>
> Tom Dean
>
>
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