Why are the inequality expressions not evaluated correctly?

My code is: grid is just a 5x6 matrix, so is visited.

neighbor=[3 4]
if((neighbor(1)>0) && (neighbor(1)<size(grid,1)+1) && (neighbor(2)>0) && (neighbor(2)<size(grid,2)+1) && (visited(neighbor(1),neighbor(2)==-1)))

Matlab gives the following error: Operands to the and && operators must be convertible to logical scalar values.

What's going wrong? I tried to debug step by step but could not figure out the mistake.

Answer 1

[Image Analyst]

Perhaps you meant:

if((neighbor(1)>0) && (neighbor(1)<size(grid,1)+1) && (neighbor(2)>0) && (neighbor(2)<size(grid,2)+1) && (visited(neighbor(1),neighbor(2))==-1))