Matlab Tutorial - Multiplying Matrices

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In this lesson, the student will learn how to input matrices and perform matrix multiplication.
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Hello Sir,

I am trying to multiply 255x1 with 255x1 matrix but unable to it and a error occurs 'Error using .*
Matrix dimensions must agree.'

namasteygermany
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why is it * instead of .*
my teacher sucks at teaching...
when do you know when to use which? she said we need .* for matrix multiplication, but it gave me the wrong matrix ( i confirmed this with graphing calculator).

cLmbiangat