The Two Different Output and rref( ) function.

[lvl107]

Hello Everyone,

I have a question, wish learning and need help.

Am I wrong with mine ?

Many thanks in advance.

Best regards,

Loi Le.

[Fred_Kohlhepp]

You're not wrong, you're just not done.

Use the third row (0 0 0 -1) to eliminate the 2/3 in each of the first two rows.

[AndyWesterman]

But that row requires that:

0 * X + 0 * Y + 0 * Z = 1

=>Equation 1 & Equation 3 are inconsistent.

Regards

Andy

[lvl107]

I agree with you, Andy.

Regards,

Loi.

[lvl107]

Many thanks, Fred. I got it. And I have a related question : "rref( ), rref( ) and symbolics".

In this case, are there the two different output ? ( with applying symbolics )

Many thanks in advance.

Regards,

Loi Le.

[Fred_Kohlhepp]

The symbolic evaluation of (the built-in) rref(M) is only expanding M inside the brackets.

The symbolic evaluation of rref(M) is executing rref, then simplyfing the resulting matrix.