The length of 256x256 image

The length of 256x256 image is

Answer 1

[Star Strider]

256

There are severall ways of determining the various dimensions of an array in MATLAB, the size function being the most useful. The length function returns the largest dimension of an array, that may not be the dimension you are interested in. The numel funciton returns the number of elements in an array.

So use size, and resolve the ambiguities.

There are a number of other related functions linked in and at the end of the size documentation, so it would be best to explore them as well.

[Walter Roberson]

This is the effective code for how length is defined:

function L = length(SomeArray)
   dimensions = size(SomeArray);
   if any(dimensions) == 0
       L = 0;       %empty on ANY dimension replies length 0
   else
       L = max(dimensions);  %otherwise it is the largest dimension
   end
end