Within a java project I’ve developed I need to calculate the inverse of a matrix. In order to align with other projects and other developers I’m using the Efficient Java Matrix Library (orj.ejml). For inverting the Matrix I’m using invert from org.ejml.ops.CommonOps, and I has worked fine un…
Tag: matrix
How to get Cartesian product from multiple lists?
Say I have several List<T>s, I will put them into another list or other collections, so I don’t know how many list<T> I have until I call List<List<T>>.size() Take below List<Integer> as an example: How can I get the result of list1*list2*list3*…listn as a Cartesian p…
Transposing a matrix from a 2D array
I’m self teaching myself some java and I’m stuck on creating a 2D array that initializes it with random values and then creates the transpose of the array. An example output is: Original matrix Transposed matrix ^ Should be the final output. Some help with the code would appreciated! I would like …
Multiplying two matrices in Java
I am currently developing a class to represent matrices, it represents any general mxn matrix. I have worked out addition and scalar multiplication but I am struggling to develop the multiplication of two matrices. The data of the matrix is held in a 2D array of doubles. The method looks a little bit like thi…
transpose double[][] matrix with a java function?
Do anybody have a function with which I can transpose a Matrix in Java which has the following form: I have function like this: but its wrong somewhere. Answer
Java inverse matrix calculation
I’m trying to calculate the inverse matrix in Java. I’m following the adjoint method (first calculation of the adjoint matrix, then transpose this matrix and finally, multiply it for the inverse of the value of the determinant). It works when the matrix is not too big. I’ve checked that for …