Plotting Matrix Operator in Matlab

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How to plot a matrix operator in matlab ? Let us take a matrix, Euler matrix $E^r=(e^{r}_{nk})$ defined by \begin{equation} e^{r}_{nk}= \begin{cases} \binom{n}{k}(1-r)^{n-k}r^k &\quad (0\leq k\leq n)\\ 0 &\quad (k>n), \end{cases} \end{equation} where $0<r<1$. Now for some particular values of $r$ say $r=\frac{1}{2}$, how do we plot the matrix $E^r$ using MATLAB. Please share MATLAB programming as I am new to MATLAB.