MATLAB Programming 16 - sum()

S = sum(A) returns the sum of the elements of A along the first array dimension whose size does not equal 1.

• If A is a vector, then sum(A) returns the sum of the elements.
• If A is a matrix, then sum(A) returns a row vector containing the sum of each column.
• If A is a multidimensional array, then sum(A) operates along the first array dimension whose size does not equal 1, treating the elements as vectors. This dimension becomes 1 while the sizes of all other dimensions remain the same.

S = sum(A,dim) returns the sum along dimension dim. For example, if A is a matrix, then sum(A,2) is a column vector containing the sum of each row.

S = sum(___,outtype) returns the sum with a specified data type, using any of the input arguments in the previous syntaxes. outtype can be 'default','double', or 'native'.

S = sum(___,nanflag) specifies whether to include or omit NaN values from the calculation for any of the previous syntaxes. sum(A,'includenan') includes all NaNvalues in the calculation while sum(A,'omitnan') ignores them.

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