Just finished a prototype of the project SymJava (
https://github.com/yuemingl/SymJava ) which is similar to sympy. Actually,
I borrowed some ideas from sympy. Thanks all the sympy contributors.
The reason to develop this library is that sympy can NOT run on JPython :(.
I have another Java library FuturEye for numerical computation to solve PDE
constrained inverse problems. Symbolic computation is important for this
library since it will reduce a huge amount of time with automatic
functional derivative computation.
Here is a piece of example code of SymJava:
Expr expr = x + y * z;
System.out.println(expr); //x + y*z
Expr expr2 = expr.subs(x, y*y);
System.out.println(expr2); //y^2 + y*z
System.out.println(expr2.diff(y)); //2*y + z
Func f = new Func("f1", expr2.diff(y));
System.out.println(f); //f1(y,z)
BytecodeFunc func = f.toBytecodeFunc(); //Similar to the lambdify in sympy
System.out.println(func.apply(1,2)); //4.0
There are two important features:
1. Operator Overloading is implemented by using
https://github.com/amelentev/java-oo
2. Lambdify in sympy is implemented in SymJava by using BCEL library
Let me know if any one interested in this? Just send me an email:
nkliuyuemingATgmail.com
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