## S3 method for class 'optObj_cplexAPI':
changeMatrixRow(lp, i, j, val)## S3 method for class 'optObj_glpkAPI':
changeMatrixRow(lp, i, j, val)
## S3 method for class 'optObj_lpSolveAPI':
changeMatrixRow(lp, i, j, val)
optObj.j containing the new non-zero
elements.optObj and constructor function
optObj.