New API methods: remove row/column

[vkostyukov]

For now, users can still use select method in order to remove n rows/columns from matrix. Like this:

Matrix a = Matrices.asMatrix3x3(...);
Matrix b = a.select(new int[] {0, 1}, new int[] {0, 1, 2}); // removes the last row
Matrix c = a.select(new int[] {0, 1, 2}, new int[] {0, 2}); // removes the second column

Users are also asking me about a particular methods for this: removeRow(int i) and removeColumn(int j).

We also should probably think about opposite methods, like insertRow/insertColumn. This might be done in a next release.

[SamoylovMD]

Do we need to optimize methods for sparse matrices, or we can stay (for now) on this version?

[vkostyukov]

Lets start within a simple version. How about also having a couple of additional methods like removeFirstRow(), removeFirstColumn(), removeLastRow() and removeLastColumn()?

[SamoylovMD]

Accepted. Will be done in few minutes.

[vkostyukov]

Looks like this is done.