Re: [ojAlgo-user] power or round functionality

[Argyrouska B. <esp...@gm...>]

Hi again,

Would it be easy for you to provide a very simple example?
e.g. I have an array and I want to do the pow operation to constant value
(let's say 3). So: a[1].pow(3), a[2].pow(3), a[3].pow(3) etc..

thanks again

On 29 April 2015 at 01:06, Anders Peterson <an...@op...> wrote:

> I think you misinterpret “binary function”
>
> http://en.wikipedia.org/wiki/Binary_function
>
> http://ojalgo.org/generated/org/ojalgo/function/BinaryFunction.html
>
>
> Did you bother to look at UnaryFunction, BinaryFunction and the other
> interfaces/classed in that package?
>
>
> > On 28 apr 2015, at 23:24, Argyrouska Bob <esp...@gm...> wrote:
> >
> > Hi,
> >
> > It seems a little hard to find any examples in the Javadocs. How exactly
> you define an exponential operation (not a binary one like  XOR ^) using a
> BinaryFunction?
> >
> > Thanks again for your support
> >
> > On 27 April 2015 at 22:43, Anders Peterson <an...@op...> wrote:
> > Rounding can be done using UnaryFunction - just create an instance that
> does what you want. The class NumberContext can give you a function that
> may suit you. Instantiate a NumberContext and then call get***Function()
> >
> > There’s also the SCALE function of PrimitiveFunction. When/if you
> specify the parameter it turns into a unary function.
> >
> > I think you should switch from using BasicMatrix to
> MatrixStore/PhysicalStore.
> >
> > For “pow” you need a binary function...
> >
> > fillMatching(Access1D<? extends Number>)
> > fillMatching(Access1D<Double>, BinaryFunction<Double>, Access1D<Double>)
> > fillMatching(Access1D<Double>, BinaryFunction<Double>, Double)
> > fillMatching(Double, BinaryFunction<Double>, Access1D<Double>)
> >
> >
> > > On 27 apr 2015, at 20:30, Argyrouska Bob <esp...@gm...> wrote:
> > >
> > > Sorry,
> > >
> > > Thanks for your prompt reply.
> > > Maybe I didn't make myself clear. I was referring to exponential
> similar to what native Java Math.pow() does.
> > > What I am looking for is:
> > >
> > > BasicMatrix tA, tB;
> > > tA.pow(tB); or tA.pow(2.0);
> > >
> > > which will eventually lead to tA^x, where x=element from tB (applied
> for each element) or a constant value.
> > > Secondly a round function similar to what native Java Math.round()
> offers.
> > > Meaning:
> > >
> > > BasicMatrix tA;
> > > tA.round(RoundindMode);
> > >
> > > which will result in rounding each element of tA to RoundingMode,
> where RoundingMode=FLOOR, CEILING etc
> > > Are these possible using UnaryFunctions?
> > >
> > > Thanks
> > >
> > > On 27 April 2015 at 20:00, Anders Peterson <an...@op...>
> wrote:
> > > Sorry, I just noticed you were using BasicMatrix. It works a little
> different there (a somewhat limited set of functionality) partly because
> BasicMatrix instances are immutable. It does have a modify-method:
> > >
> > >     BasicMatrix modify(UnaryFunction<? extends Number>);
> > >
> > >
> > >
> > >
> > > > On 27 apr 2015, at 18:51, Anders Peterson <an...@op...>
> wrote:
> > > >
> > > > Do you want to modify matrix elements?
> > > >
> > > > Everything that implements Access2D.Modifiable has these methods:
> > > >
> > > > modifyColumn(long, long, UnaryFunction<N>)
> > > > modifyDiagonal(long, long, UnaryFunction<N>)
> > > > modifyOne(long, long, UnaryFunction<N>)
> > > > modifyOne(long, UnaryFunction<N>)
> > > > modifyRange(long, long, UnaryFunction<N>)
> > > > modifyRow(long, long, UnaryFunction<N>)
> > > >
> > > > If you’re using primitive double elements you’ll find a predefined
> set of functions in org.ojalgo.function.PrimitiveFunction
> > > >
> > > > The PhysicalStore.Factory also provides access to that set of
> functions.
> > > >
> > > > If you don’t find what you need you just create a custom
> UnaryFunction implementation.
> > > >
> > > > /Anders
> > > >
> > > >
> > > >> On 27 apr 2015, at 18:29, Argyrouska Bob <esp...@gm...>
> wrote:
> > > >>
> > > >> Hello,
> > > >>
> > > >> I am a new member and still practicing with library but what
> surprises me is that I haven't found support for power functions or round
> to a BasicMatrix data type. Is this true or it's named somewhat different?
> > > >>
> > > >> Thanks and regards,
> > > >> silver
> > > >>
> > > >>
> > > >>
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