Error message received when entering code

I'm receiving this error message and am unsure as to why.

Answer 1

[Voss]

'dot' is both a function and a variable. Use clear dot to remove the variable dot.

Then when you run dot(U1,U2), it'll calculate the dot product of U1 and U2 rather than trying to figure out the U1,U2 index of the variable dot.

[Debra Nicholls]

Thank you so much!