Convert Excel solver to java

Question

I am trying to convert a Excel Solver solution to a java app

The excel solver is

Solver Parameters:
Set Objective: D24 to Max
By Changing Variable Cells: C4:C23
Subject to the Constraints:
C24 = B24
L24 <= N24
L25 >= N25
(non-negative)
GRG Nonlinear

I have been goggling for sometime and cannot find a java library to achieve this. Any ideas?

I have tried choco-solver http://www.emn.fr/z-info/choco-solver/

    Solver solver = new Solver("my first problem");
    // 2. Create variables through the variable factory 
    IntVar x = VariableFactory.bounded("X", 0, 5, solver);
    IntVar y = VariableFactory.bounded("Y", 0, 5, solver);
    // 3. Create and post constraints by using constraint factories
    solver.post(IntConstraintFactory.arithm(x, "+", y, "<", 5)); 
    // 4. Define the search strategy
    solver.set(IntStrategyFactory.inputOrder_InDomainMin(new IntVar[]{x,y} )); 
    // 5. Launch the resolution process
      if (solver.findSolution()) {
            do {
                prettyOut();
            }
            while (solver.nextSolution());
        }

I am finding it difficult to relate this to the Excel solver functions, my math is not great

Answer 1

If you are looking for an API to read and write to microsoft documents, take a look at Apache POI:

http://poi.apache.org/
http://viralpatel.net/blogs/java-read-write-excel-file-apache-poi/

Answer 2

There is a Simplexsolver implementation in Apache Commons Math , but I can't say anything on performance or possible problem size. Finding non-propertery solutions for optimization problems, can be tricky because it is very difficult to efficently optimize large problem sizes and it is an ongoing field of research with only a hand full of good commerical/research solutions.

If you want to keep excelfiles as input you need to parse the data and convert it. For reading Excel files you can use Apache POI .