What does operator dot mean

Question

Given the code      A    1 2 3  3 2 1   B   A  2   The output     B         1     4     9      9     4     1   But if I do this   B   A 2  The output is    Error using     Inputs must be a scalar and a square matrix  To compute elementwise POWER  use POWER      instead    What does the operator   do exactly

User · Accepted Answer

The dot itself is not an operator     is   The    is a pointwise    i e  element-wise  power  as    is the pointwise product            Array power  A  B is the matrix with elements A i j  to the B i j  power  The sizes of A and B must be the same or be compatible    C f     Array vs  Matrix Operations   https   mathworks com help matlab matlab prog array-vs-matrix-operations html  Pointwise   http   en wikipedia org wiki Pointwise  Element-Wise Operations   http   www glue umd edu afs glue umd edu system info olh Numerical Matlab Matrix Manipulation Software Matrix Vector Operations elementwise       Hence the dot

User · Answer

There is a whole page in the MATLAB documentation dedicated to this topic  Array vs  Matrix Operations  The gist of it is below   MATLAB   has two different types of arithmetic operations  array operations and matrix operations  You can use these arithmetic operations to perform numeric computations  for example  adding two numbers  raising the elements of an array to a given power  or multiplying two matrices  Matrix operations follow the rules of linear algebra  By contrast  array operations execute element by element operations and support multidimensional arrays  The period character     distinguishes the array operations from the matrix operations  However  since the matrix and array operations are the same for addition and subtraction  the character pairs    and  - are unnecessary

[matlab] What does operator "dot" (.) mean?

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