LTspice • Developed in 1998 by Mike Engelhardt at Linear Technology Corporation • GUI, simulator, and schematic -> netlist for SPICE • FREEand comes with tons of models
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A dense matrix stored in a NumPy array can be converted into a sparse matrix using the CSR representation by calling the csr_matrix() function. In the example below, we define a 3 x 6 sparse matrix as a dense array, convert it to a CSR sparse representation, and then convert it back to a dense array by calling the todense() function.
For example, BJT transistor models are in .\standard.bjt. MOSFET models are in standard.mos. You can open the files from within LTspice which has the advantage of context aware color coding, or as text files with notepad, wordpad, or another text editor. Add the .model statement to the appropriate file.