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1-Newbie

## Numerical solution vs Analytical solution

Hi community,

I have a system equations 8x8, which I find its analytical solution with a approximation. I want solved numerically this system 8x8, but without this approximation. But I compare the analytical solution to numerical with approximation, and they aren't same. I used the command

linearsolve

this command has a error?, How many?

Thank you for your help and colaboration

mfduqued

5 REPLIES 5
1-Newbie
(To:mfduqued)
 Mauricio Fabian Duque Daza wrote:Hi community,I have a system equations 8x8, which I find its analytical solution with a approximation. I want solved numerically this system 8x8, but without this approximation. But I compare the analytical solution to numerical with approximation, and they aren't same. I used the commandlinearsolvethis command has a error?, How many?Thank you for your help and colaborationmfduqued

Your command is requiring a linear method for solution, some problems will not be solved using linear methods. Try a solve block; if "Find" does not produce a solution, try "Minerr."

1-Newbie
(To:f.kohlhepp)

Thank you for your time, How do I try solve a block?

1-Newbie
(To:mfduqued)

Look up solve blocks in Mathcad help

19-Tanzanite
(To:mfduqued)

Exactly what are you comparing to what? It's not at all clear in your worksheet.

1-Newbie
(To:mfduqued)

>I have a system equations 8x8, which I find its analytical solution with a approximation<

____________________________

I won't trust that for a dime !

1. Check for reducing the system to symbolic solutions
2. NON-linear systems solve by Given/Find .
Levenberg-Marquardt is the general NL solver .
3. Watch for all sorts of culprits !
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