Re: [Geotools-devel] Replacing Vecmath

[Jody G. <jod...@gm...>]

Details.
https://code.google.com/p/efficient-java-matrix-library/

Apache license.

Looks like it is available in maven central.

On Fri, Feb 13, 2015 at 12:24 PM Eric Engle <ee...@go...> wrote:

> I think you'll be happy with EJML, for all of that.  They have a
> high-handed but easy-to-use API, a low-level and tweakable API, and an
> implementation mindset that questions what L2 cache does with each
> algorithm.  It's... significantly faster than some of the alternatives like
> JAMA.
>
> On Sat, Feb 7, 2015 at 9:35 AM, Jody Garnett <jod...@gm...>
> wrote:
>
>> So Eric is the above breakdown useful? Our priorities are are accuracy
>> and speed :)
>>
>> --
>> Jody Garnett
>>
>> On 4 February 2015 at 19:55, Jody Garnett <jod...@gm...> wrote:
>>
>>> Let me try:
>>>
>>> *gt-metadata: *looks to just be data structure (Point3d and
>>> MismatchedSizeException)
>>>
>>> org.geotools.math.Line
>>> org.geotools.math.Plane
>>>
>>> *gt-referencing: *uses assorted exceptions, extends GMatrix, and
>>> Matrix3d/Matrix4d multiply
>>>
>>> org.geotools.referencing.operation.DefaultCoordinateOperationFactory
>>>
>>> org.geotools.referencing.operation.builder.AdvancedAffineBuilder
>>> org.geotools.referencing.operation.builder.AffineTransformBuilder
>>> org.geotools.referencing.operation.builder.BursaWolfTransformBuilder
>>> - Imports GMatrix but does not use it
>>> org.geotools.referencing.operation.builder.MathTransformBuilder
>>> org.geotools.referencing.operation.builder.ProjectiveTransformBuilder
>>> org.geotools.referencing.operation.builder.RubberSheetBuilder
>>> org.geotools.referencing.operation.builder.SimilarTransformBuilder
>>>
>>> org.geotools.referencing.operation.matrix.GeneralMatrix
>>> - extends GMatrix (this is the key integration point with vecmath)
>>> org.geotools.referencing.operation.matrix.Matrix1.java
>>> org.geotools.referencing.operation.matrix.Matrix2.java
>>> org.geotools.referencing.operation.matrix.Matrix3.java
>>> - uses Matrix3d.multiply
>>> org.geotools.referencing.operation.matrix.Matrix4.java
>>> - uses Matrix4d.multiply
>>> org.geotools.referencing.operation.matrix.XMatrix.java
>>>
>>> org.geotools.referencing.operation.transform.AbstractMathTransform
>>> org.geotools.referencing.operation.transform.ProjectiveTransform
>>>
>>> So it comes down to:
>>>
>>> * Extending GMatrix
>>> * delegating to Matricx3d multiply and Matrix4d.muiltiply
>>>
>>> So we are stuck going through the GMatrix methods and seeing which ones
>>> are called. Going to ignore things like constructors/equals/set/get (so we
>>> can focus on where the math is used)
>>> - GMatrix.add(GMatrix,GMatrix) - used by cglib-nodep-2.1_3.jar (not sure
>>> what this is)
>>> - GMatrix.invert() - called by AdvancedAffineBuilder,
>>> BursaWolfTransformBuilderm ProjectiveTransformBuilder
>>> - GMatrix.mul(GMatrix) called by BursaWolfTransformBuilder, GeneralMatrix
>>> - GMatrix.mul(GMatrix,GMatrix) called by AdvancedAffineBuilder,
>>> BursaWolfTransformBuilder, ProjectiveTransformBuilder, ConcatenatedTransform
>>> - GMatrix.negate() called by AdvancedAffineBuilder,
>>> BursaWolfTransformBuilder
>>> - GMatrix.sub(GMatrix) called by MathTransformBuilderTest
>>> - GMatrix.sub(GMatrix,GMatrix) called by AdvancedAffineBuilder,
>>> BursaWolfTransformBuilder
>>> - GMatrix.transform() called by AdvancedAffineBuilder,
>>> BursaWolfTransformBuilder, ProjectiveTransformBuilder
>>>
>>>
>>> Not quite sure what to make of that .. looks like multiply, invert,
>>> negate, transform are our actual requirements.
>>>
>>>
>>> --
>>> Jody Garnett
>>>
>>> On 4 February 2015 at 18:58, Eric Engle <ee...@go...> wrote:
>>>
>>>> I've used almost all of those options at one time or another, but is
>>>> there a synopsis of the vecmath features that are actually used within
>>>> Geotools?
>>>>
>>>> On Wed, Feb 4, 2015 at 1:20 PM, Tyler Battle <tb...@bo...>
>>>> wrote:
>>>>
>>>>> Thanks to Jody, for pointing me at
>>>>> http://docs.codehaus.org/display/GEOTOOLS/Replace+Vecmath
>>>>>
>>>>> Has anyone worked with any of these (or similar) libraries?
>>>>>
>>>>> When I have some free time, I'm going to try some of the drop-in
>>>>> (fingers crossed) replacements. If there isn't a loss in performance, this
>>>>> would be an easy short/medium term solution. Does anyone have any
>>>>> suggestions for testing the performance of these libs?
>>>>>
>>>>> Switching to a more specialized library or rolling our own is also an
>>>>> option. My expertise is very limited in this respect, so I'd need a lot of
>>>>> help if we want to consider this option.
>>>>>
>>>>> --
>>>>>
>>>>> Tyler Battle
>>>>>
>>>>> Software Engineer| Boundless
>>>>>
>>>>> tb...@bo... <ca...@bo...>
>>>>>
>>>>> Victoria, BC, Canada
>>>>>
>>>>>
>>>>> <https://twitter.com/boundlessgeo>
>>>>>
>>>>>
>>>>>
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>>>>
>>>>
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