Scatter plot of samples

`sdo.scatterPlot(`

is
the same as `X`

)`sdo.scatterPlot(X,X)`

, except that the
subaxes along the diagonal are replaced with histogram plots of the
data in the corresponding column of `X`

. For example,
the subaxes along the diagonal in the *i*th column
is replaced by `hist(X(:,i))`

.