Re: [ojAlgo-user] power or round functionality

[Anders P. <an...@op...>]

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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> Performance metrics, stats and reports that give you Actionable Insights
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> 
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> ------------------------------------------------------------------------------
> One dashboard for servers and applications across Physical-Virtual-Cloud 
> Widest out-of-the-box monitoring support with 50+ applications
> Performance metrics, stats and reports that give you Actionable Insights
> Deep dive visibility with transaction tracing using APM Insight.
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