Error using == Matrix dimensions must agree.

if(color ==[255 255 255 ]  || color==[0 0 0] || color==[255 0 0] || color==[205 133 63] || color==[101 67 33] || color==[0 134 139] )
end

[madhan ravi]

isn’t https://www.mathworks.com/matlabcentral/answers/442823-how-to-solve-unexpected-matlab-expression-in-the-below-line#answer_359207 the same?

[Riya Bothara]

expression is same but the different error is occur.

Answer 1

[Walter Roberson]

if color is a 1 x 1 x 3 array instead of a 1 x 3 array, then the == would fail in R2016a and earlier.

If color is a M x N x 3 array then comparing to a 1 x 3 array would fail in R2016a or earlier. In R2016b or later, it would only succed if N were 3 , so that you were comparing a M x 3 x 3 array to a 1 x 3 array, in which case it would be comparing rows to the given color value.

If your color array did happen to be the right size to match against a 1 x 3 array, or if you were to compare M x N x 3 to reshape([255 255 255], 1, 1, 3) then the == would not fail. However in such a case, the || would fail. || can only be used to "or" together conditions if each of the conditions is scalar.