Symja - Java computer algebra library - https://github.com/axkr/symja_android_library
implementation "org.apfloat:apfloat-applet:1.9.1" to my build.gradle. I think it changed something, but I got a new Symja-related error:[2021-05-15T01:57:51,755][WARN ][stderr ] [TIM] java.lang.NoClassDefFoundError: org/codehaus/commons/compiler/CompileException
[2021-05-15T01:57:51,755][WARN ][stderr ] [TIM] at org.matheclipse.core.builtin.CompilerFunctions$Initializer.init(CompilerFunctions.java:76)
[2021-05-15T01:57:51,756][WARN ][stderr ] [TIM] at org.matheclipse.core.builtin.CompilerFunctions$Initializer.access$200(CompilerFunctions.java:72)
[2021-05-15T01:57:51,756][WARN ][stderr ] [TIM] at org.matheclipse.core.builtin.CompilerFunctions.initialize(CompilerFunctions.java:84)
[2021-05-15T01:57:51,757][WARN ][stderr ] [TIM] at org.matheclipse.core.expression.F.<clinit>(F.java:910)
[2021-05-15T01:57:51,757][WARN ][stderr ] [TIM] at org.matheclipse.core.eval.ExprEvaluator.<clinit>(ExprEvaluator.java:133)
...
[2021-05-15T01:57:51,769][WARN ][stderr ] [TIM] Caused by: java.lang.ClassNotFoundException: org.codehaus.commons.compiler.CompileException
...[2021-05-15T02:35:13,743][INFO ][stdout ] [TIM] doToQuery()
[2021-05-15T02:35:13,745][INFO ][stdout ] [TIM] transcribe()
[2021-05-15T02:35:13,745][INFO ][stdout ] [TIM] transcribe()
[2021-05-15T02:35:13,746][INFO ][stdout ] [TIM] (matchquery$$fuchs&&(matchquery$$schaf||(!matchquery$$schaf&&matchquery$$huhn)))||(!matchquery$$matchquery$$fuchs&&matchquery$$schaf&&matchquery$$wolf)
[2021-05-15T02:35:13,776][INFO ][stdout ] [TIM] CommutingQuantumQuery
[2021-05-15T02:35:13,788][INFO ][stdout ] [TIM] CommutingQuantumWeight
[2021-05-15T02:35:13,790][INFO ][stdout ] [TIM] CommutingQuantumScorer
[2021-05-15T02:35:13,791][INFO ][stdout ] [TIM] score()[2021-05-15T02:35:14,733][INFO ][stdout ] [TIM] Index 1 out of bounds for length 1
[2021-05-15T02:35:14,742][WARN ][r.suppressed ] [TIM] path: /fables/_search, params: {index=fables}
org.elasticsearch.action.search.SearchPhaseExecutionException: all shards failed
at org.elasticsearch.action.search.AbstractSearchAsyncAction.onPhaseFailure(AbstractSearchAsyncAction.java:661) [elasticsearch-8.0.0-SNAPSHOT.jar:8.0.0-SNAPSHOT]
...
Caused by: java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.Float (java.lang.Integer and java.lang.Float are in module java.base of loader 'bootstrap')
at org.elasticsearch.index.search.CommutingQuantumScorer.score(CommutingQuantumScorer.java:91) ~[?:?]
...
https://github.com/axkr/symja_android_library#license
{termquery$$fuchs,termquery$$huhn,termquery$$schaf,termquery$$wolf} which works here: http://matheclipse.org/
IExpr varsExpr = calcEvaluator.eval("Variables(" + calc + ")"); evaluates to {termquery$$fuchs,termquery$$huhn,termquery$$schaf,termquery$$wolf}, the same code in 2.0.0-SNAPSHOT evaluates to just Variables(termquery$$fuchs*(termquery$$huhn*(1-termquery$$schaf)+termquery$$schaf)+(1-termquery$$fuchs)*termquery$$schaf*termquery$$wolf)
calc is of course my test string "termquery$$fuchs*(termquery$$huhn*(1-termquery$$schaf)+termquery$$schaf)+(1-termquery$$fuchs)*termquery$$schaf*termquery$$wolf" in the examples above)
Hi, Is. there a plan to support Matrix Calculus in Symja, where, a matrix or vector can be manipulated as a whole? Such a support exists in Sympy, as illustrated as follows:
X = MatrixSymbol('X', 3, 3)
Y = MatrixSymbol('Y', 3, 3)
(X.TX).IY. would give 𝑋^(−1) (𝑋^𝑇)^(−1) 𝑌 // where, X.T is transpose(X); X.I is inverse(X)
What would be even better is to support the formulae in Matrix Calculus for differentiations of Matrix expressions (https://en.wikipedia.org/wiki/Matrix_calculus), such as
D(transpose(a)*X*b, X) would produce
b*transpose(a)
where a and b are two vectors and X is a matrix of compatible shapes.
Such a support would make Symja very useful in Differentiable Programming of tensor-based programs.
M is defined as 3x3 matrix
TensorDimensions(M)@axkr Thanks for the thought. I've filed a feature request. The implementation is probably not too complicated, but does have some subtle aspects (e.g., matrix layout conventions: https://en.wikipedia.org/wiki/Matrix_calculus#Layout_conventions ).
So far, I haven't found an open-source tool with a full support of that feature. Sympy's support is incomplete. MatrixCalculus (http://www.matrixcalculus.org/) has a good support, but is not open-sourced. If Symja implements it, it could be the first open-source tool with that feature.