On 2014-06-20, David Ingerman <[email protected]> wrote:
> Thank you, so what to do for Python function? Matlab had general purpose
> 'optim(f)' if my memory is right...
you can e.g. use find_root(); this is a numerical thing that accepts
Python functions. Here is an example:
sage: def f(x):
return x-cos(x)
....:
sage: find_root(f,0,1)
0.7390851332151559
sage:
>
> On Wednesday, June 11, 2014 1:50:10 AM UTC-7, Dima Pasechnik wrote:
>>
>> On 2014-06-10, David Ingerman <[email protected] <javascript:>> wrote:
>> >
>> > How to solve([f(x)==0],x) for a function "f(x)" defined in a .sage
>> file?
>> >
>> > The error message: TypeError: Cannot evaluate symbolic expression to a
>> > numeric value.
>>
>> what is f(x) ?
>> solve() won't work for a Python function, it needs a symbolic
>> expression, e.g.
>>
>> sage: type(sin(x))
>> <type 'sage.symbolic.expression.Expression'>
>> sage:
>>
>> >
>> > Thank you...
>> >
>>
>>
>
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