Nick Alexander wrote:
>
> On 27-Oct-09, at 3:17 PM, Jason Grout wrote:
>
>> I was looking at how to make my calc 3 calculations easier to
>> understand
>> by calling a multivariable function with a vector input. I ended up
>> with a coercion error. I'm not that familiar with how to work with
>> the
>> coercion system. Would it be easy to make the call "f(r)" work below?
>>
>> Thanks,
>>
>> Jason
>>
>>
>> sage: var('t')
>> t
>> sage: r=vector([t,t^2])
>> sage: f(x,y)=x^2+y
>> sage: f(r)
>
> This isn't really a coercion error. f expects two inputs; you've
> given it one. Try f(*r).
>
> Fixing this means adding yet another special case; I vote strongly
> against. (BTW, all my work these days involves symbolic functions of
> vector inputs, so I've dealt with this a lot and still believe adding
> a special case is a bad idea.)
Why do you think that f, which is a function from R^2->R^1, should not
naturally be able to take inputs that live in R^2?
Thanks,
Jason
--
Jason Grout
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