Why are the inequality expressions not evaluated correctly?

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ingstalam
ingstalam 2015-2-2
回答： Image Analyst 2015-2-2
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.

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Image Analyst
Image Analyst 2015-2-2
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))

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