Sparse Matrix problem

[pyeehwong]

• Hi All,
• I am new to this community. Any hints on solving linear systems of equations using the Isolve function? I have a problem with 5 equations but with 3 unknowns. Any clues?

[Werner_E]

• Any hints on solving linear systems of equations using the Isolve function?

Yes, look at the built-in help. You may also search this forum.

• I have a problem with 5 equations but with 3 unknowns. Any clues?

Clues for what? You probably know yourself that you cannot expect a solution in every case if you have more equations to satisfy than variables. Maybe something like minerr() could be appropriate.

If you have a concrete problem, state the version of Mathcad used, post the worksheet to show what you have done so far and clearly describe what you are searching for.

[Dmitri_K]

In Mathcad 15 lsolve for overderdetermined system gives "pseudosolution", i.e. solution with minimal norm

For underdetermined system lsolve gives: