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The Two Different Output and rref( ) function.

lvl107
20-Turquoise

The Two Different Output and rref( ) function.

Hello Everyone,

I have a question, wish learning and need help.

Example2.PNG

Example 2.PNG

rref( ).PNG

Am I wrong with mine ?

Many thanks in advance.

Best regards,

Loi Le.

5 REPLIES 5
Fred_Kohlhepp
23-Emerald I
(To:lvl107)

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.

But that row requires that:

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

=>Equation 1 & Equation 3 are inconsistent.

Regards

Andy

lvl107
20-Turquoise
(To:AndyWesterman)

I agree with you, Andy.

Regards,

Loi.

lvl107
20-Turquoise
(To:Fred_Kohlhepp)

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

rref( ) and Symbolics.PNG

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

Many thanks in advance.

Regards,

Loi Le.

Fred_Kohlhepp
23-Emerald I
(To:lvl107)

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.

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