ojalgo

问题 I currently have a SparseStore matrix on which I perform a lot of counting and calculations. I want to store it to file, so I can later reuse it without re-doing all previous calculations. I tried basic serialization in Java: ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream(exportFileName)); outputStream.writeObject(mySparseStoreInstance); but it seems the class doesn't implement java.io.Serializable: java.io.NotSerializableException: org.ojalgo.matrix.store

问题 I currently have a SparseStore matrix on which I perform a lot of counting and calculations. I want to store it to file, so I can later reuse it without re-doing all previous calculations. I tried basic serialization in Java: ObjectOutputStream outputStream = new ObjectOutputStream(new FileOutputStream(exportFileName)); outputStream.writeObject(mySparseStoreInstance); but it seems the class doesn't implement java.io.Serializable: java.io.NotSerializableException: org.ojalgo.matrix.store

问题 I am developping a java evolution tool with ojAlgo, and I try to resolve the following equation : where A is a sparse matrix (for now the dimension of the matrix is 2000 x 2000, it will be scaled later on), A is not symmetric and use only real values. I made some researchs and I tried to find the way to resolve this equation (using SparseStore) on github wiki/javadoc but I didn't find a way to do it. Can you help me find methods/class I should use ? Thank you 回答1: There is no direct/specific

问题 Can anyone tell me how to multiply corresponding elements of two matrices in ojAlgo? Looking for block function for c[i][j] = a[i][j] * b[i][j] 回答1: There are several ways to do that. Here's one alternative: matrixA.operateOnMatching(MULTIPLY, matrixB).supplyTo(matrixC); Where MULTIPLY comes from a static import (org.ojalgo.function.constant.PrimitiveMath). 来源： https://stackoverflow.com/questions/41665158/elementwise-multiplication-two-matrices-or-primitivedensestores-in-ojalgo

问题 Looking for a function to add/subtract a double from all elements of a matrix or dense store. 回答1: Some alternatives: matrixA.operateOnAll(ADD.second(scalarB)).supplyTo(matrixC); matrixC.fillMatching(matrixA, ADD, scalarB); matrixC.modifyAll(ADD.second(scalarB)); matrixA.passMatching((from, i, j, to) -> { to.set(i, j, from.doubleValue(i, j) + scalarB); }, matrixC); Where ADD comes from a static import (org.ojalgo.function.PrimitiveFunction) and the call to the second(...) method set/locks the