What does this error mean?

I get an error when calling the eig() function.

First I thought my matrix is somehow 'bad' for computing the eigenvalues.

But even if I just type

eig(eye(4))

I get the following error:

"Subscript indices must either be real positive integers or logicals."

Answer 1

[Titus Edelhofer]

Hi,

this means, that using eye(4) is not valid for indexing (which is true, since it contains zeros). This implies, that you have a variable named eig, that shadows the function.

whos eig

probably tells you that eig is a variable. Remove it

clear eig

and then eig(eyes(4)) should do what you expected.

Titus

[Rebekka Klara Gasser]

Ah I see!

You're right. I named a variable 'eig' which was not really clever.

Thank you!