Why can't i input matrices other than square matrix in MATLAB 16B and 17A??

Like when i input A=[1,2,3;4,5] MATLAB is not assigning this to variable A

[Stephen23]

The name MATLAB stands for MATrix LABoratory, and by the standard mathematical definition matrices must have an element in every location, i.e. not contain any holes. The shape you are trying to define contains holes, i.e. not all elements are defined. Ergo it is not a matrix, and will throw an error. This is the expected and correct behavior.

Answer 1

[Star Strider]

You have 3 elements in ‘A(1,:)’ and 2 in ‘A(2,:)’. That is not permitted in double arrays.

Empty elements in cell arrays are allowed:

A = {1,2,3; 4,5,[]};

However, calculating with such arrays as double arrays remain as not permitted. Fill the ‘empty’ element with NaN if you must, although it will likely result in NaN results of calculations with that matrix.