Is there a way to solve a system of equations on the DM42 with complex coefficients? i.e. A*X=B; where A contains complex numbers of the form a+jb.

Any help would be appreciated.

Thanks,

Greg

## Solve Systems of Equation with Complex Coefficients

### Re: Solve Systems of Equation with Complex Coefficients

Perhaps I'm misunderstanding but would it be the same as with a regular matrix but just using a complex matrix?

Create the empty matrix, press Enter to duplicate it, then press COMPLEX to create a complex matrix. Then fill in the matrix with the complex numbers?

Create correctly sized matrix A, duplicate it, turn it complex, and then edit it to fill in the complex numbers.

Create correctly sized matrix B, duplicate it, turn it complex, and then edit it to fill in the complex numbers.

Inverse A, then multiply it by B (A^-1 in y-register, B in X).

Create the empty matrix, press Enter to duplicate it, then press COMPLEX to create a complex matrix. Then fill in the matrix with the complex numbers?

Create correctly sized matrix A, duplicate it, turn it complex, and then edit it to fill in the complex numbers.

Create correctly sized matrix B, duplicate it, turn it complex, and then edit it to fill in the complex numbers.

Inverse A, then multiply it by B (A^-1 in y-register, B in X).

DM42 SN:00210

DM41X SN:00014

DM41X SN:00014

### Re: Solve Systems of Equation with Complex Coefficients

Thank you for this information. This is exactly what I needed to know.

### Re: Solve Systems of Equation with Complex Coefficients

With B in Y and A in X, divide. This is both faster and more accurate than inverting A, then multiplying by B.

Cheers, Werner

42S #3249S01123

DM42 #00345

DM42 #00345

### Re: Solve Systems of Equation with Complex Coefficients

There's a very nice manual available for the HP-42S which is the mother of Free42 which is the mathematical part of the SW running on the DM42. Just search the web a bit.

DM42 SN: 00041 β

HP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

**WP 43S running**on this deviceHP-35, HP-45, ..., HP-35S, WP 34S, WP 31S, DM16L

### Re: Solve Systems of Equation with Complex Coefficients

Said manual is even linked to on the SwissMicros website.

HP-42S Owner's Manual

HP-42S Programming Examples and Techniques

HP-42S Owner's Manual

HP-42S Programming Examples and Techniques

There are only 10 kinds of people in the world: those who understand binary and those who do not.