Incidence matrix

From ASCEND

The incidence matrix (or sparsity matrix) is a matrix of ones and zeros. The rows correspond to equations in your model, and the columns correspond to the variables in your model. At points where the variable corresponding to the current column is present in the equation corresponding to the current row, there will be a '1', otherwise there will be a '0'.

When incidence matrices are shown graphically in ASCEND PyGTK, a green mark is used to indicate fixed variables, and blue is used to indicate free variables (ie those that are being solved for).

[edit] See also

You can also generate an Incidence Graph of your system.