What is the complexity for solving linear equations?

I would like to know about comparison between commands 'mldivide', 'linsolve' and normal division operator '/' and '\' in terms of time taken to solve Ax=b. Also their performance with sparse matrices.

[Walter Roberson]

"mldivide" and "\" are exactly the same thing as each other. mldivide is the formal name of the routine called to implement the \ operator.

"mrdivide" and "/" are exactly the same thing as each other. mrdivide is the formal name of the routine called to implement the / operator.