Difference between revisions of "Main Page"
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Efficient Java Matrix Library (EJML) is a [http://en.wikipedia.org/wiki/Linear_algebra linear algebra] library for manipulating dense matrices. Its design goals are; 1) to be as computationally and memory efficient as possible for both small and large matrices, and 2) to be accessible to both novices and experts. These goals are accomplished by dynamically selecting the best algorithms to use at runtime, clean API, and multiple interfaces. EJML is free, written in 100% Java and has been released under an Apache v2.0 license. | Efficient Java Matrix Library (EJML) is a [http://en.wikipedia.org/wiki/Linear_algebra linear algebra] library for manipulating dense matrices. Its design goals are; 1) to be as computationally and memory efficient as possible for both small and large matrices, and 2) to be accessible to both novices and experts. These goals are accomplished by dynamically selecting the best algorithms to use at runtime, clean API, and multiple interfaces. EJML is free, written in 100% Java and has been released under an Apache v2.0 license. | ||
| − | EJML has three distinct ways to interact with it: 1) ''procedural'', 2) '' | + | EJML has three distinct ways to interact with it: 1) ''procedural'', 2) ''SimpleMatrix'', and 3) ''equations''. ''Procedure'' provides all capabilities of EJML and almost complete control over memory creation, speed, and specific algorithms. ''SimpleMatrix'' provides a simplified subset of the core capabilities in an easy to use flow styled object-oriented API, inspired by [http://math.nist.gov/javanumerics/jama/ Jama]. ''Equations'' is a symbolic interface, similar in spirit to [http://www.mathworks.com/products/matlab/ Matlab] and other [http://en.wikipedia.org/wiki/Computer_algebra_system CAS], that provides a compact way of writing equations. |
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== Code Examples == | == Code Examples == | ||
| − | + | Demonstrations on how to compute the Kalman gain "K" using each interface in EJML. | |
{| width="500pt" | | {| width="500pt" | | ||
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| − | ''' | + | '''Procedural''' |
<syntaxhighlight lang="java"> | <syntaxhighlight lang="java"> | ||
| − | + | mult(H,P,c); | |
| + | multTransB(c,H,S); | ||
| + | addEquals(S,R); | ||
| + | if( !invert(S,S_inv) ) throw new RuntimeException("Invert failed"); | ||
| + | multTransA(H,S_inv,d); | ||
| + | mult(P,d,K); | ||
</syntaxhighlight> | </syntaxhighlight> | ||
| − | ''' | + | '''SimpleMatrix''' |
<syntaxhighlight lang="java"> | <syntaxhighlight lang="java"> | ||
SimpleMatrix S = H.mult(P).mult(H.transpose()).plus(R); | SimpleMatrix S = H.mult(P).mult(H.transpose()).plus(R); | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
| − | ''' | + | '''Equations''' |
<syntaxhighlight lang="java"> | <syntaxhighlight lang="java"> | ||
| − | + | eq.process("K = P*H'*inv( H*P*H' + R )"); | |
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</syntaxhighlight> | </syntaxhighlight> | ||
|} | |} | ||
Revision as of 16:06, 21 March 2015
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Efficient Java Matrix Library (EJML) is a linear algebra library for manipulating dense matrices. Its design goals are; 1) to be as computationally and memory efficient as possible for both small and large matrices, and 2) to be accessible to both novices and experts. These goals are accomplished by dynamically selecting the best algorithms to use at runtime, clean API, and multiple interfaces. EJML is free, written in 100% Java and has been released under an Apache v2.0 license. EJML has three distinct ways to interact with it: 1) procedural, 2) SimpleMatrix, and 3) equations. Procedure provides all capabilities of EJML and almost complete control over memory creation, speed, and specific algorithms. SimpleMatrix provides a simplified subset of the core capabilities in an easy to use flow styled object-oriented API, inspired by Jama. Equations is a symbolic interface, similar in spirit to Matlab and other CAS, that provides a compact way of writing equations. |
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Code Examples
Demonstrations on how to compute the Kalman gain "K" using each interface in EJML.
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Procedural mult(H,P,c);
multTransB(c,H,S);
addEquals(S,R);
if( !invert(S,S_inv) ) throw new RuntimeException("Invert failed");
multTransA(H,S_inv,d);
mult(P,d,K);
SimpleMatrix SimpleMatrix S = H.mult(P).mult(H.transpose()).plus(R);
SimpleMatrix K = P.mult(H.transpose().mult(S.invert()));
Equations eq.process("K = P*H'*inv( H*P*H' + R )");
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Functionality
| Data Structures | Operations |
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EJML is currently a single threaded library only. Multi threaded work will start once block implementations of SVD and Eigenvalue are finished.