On matricial ranges of some matrices

چکیده مقاله

The matricial ranges of $2\times 2$ complex matrices are revisited‎. ‎Moreover‎, ‎using the standard block-matrix techniques‎, ‎we‎ ‎describe matricial ranges of some special non-quadratic higher order matrices‎. ‎Finally‎, ‎we obtain the matricial ranges of some specific $3\times 3$ matrices‎. ‎Various examples are given as‎ ‎well‎.