Trouble with MINVERSE

[David D.]

In cells A1 to C3, I'm typing in:

1 4 7
2 5 8
3 6 9

I then select cells A5 to C7 and type
=MINVERSE(A1:C3) , then CTRL-SHIFT-ENTER

and I get
#NUM! #NUM! #NUM!
#NUM! #NUM! #NUM!
#NUM! #NUM! #NUM!

in cells A5 to C7
What am I doing wrong ? Any ideas ?
Thanks in advance.

 

[Peo Sjoblom]

That means your matrix is not invertable
Check it with MDETERM, if it returns zero
MINVERSE will return #NUM!

--
Regards,

Peo Sjoblom

(No private emails please, for everyone's
benefit keep the discussion in the newsgroup/forum)

 

[Max]

Don't think you did anything wrong ..

Maybe the original matrix cannot be inverted

If you change A1 to say, 2, it'll return in A5:C7 as

1 -2 1
-2 1 0.67
1 0 -0.67

You could double check by selecting say, A9:C11,
put in the formula bar: =MMULT(A1:C3,A5:C7)
and array-enter with CTRL+SHIFT+ENTER

A9:C11 will return the identity matrix:

1 0 0
0 1 0
0 0 1

 

[Harlan Grove]

In cells A1 to C3, I'm typing in:

1 4 7
2 5 8
3 6 9

I then select cells A5 to C7 and type
=MINVERSE(A1:C3) , then CTRL-SHIFT-ENTER

and I get
#NUM! #NUM! #NUM!
#NUM! #NUM! #NUM!
#NUM! #NUM! #NUM!

....

What are you trying to do with MINVERSE? Your matrix is singular.