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# Ox: Fixes and new features in version 1.06

## New features and remarks, version 1.06

- FastMath enhancements. Several matrix operations have been speeded up significantly. These optimizations do require more memory though. By default FastMath mode is active, but if you run out of memory, you can switch it off using the -f command line switch. Affected operations are: matrix multiplication (especially matrix cross-product), determinant, ols2c, invertsym, correlation, variance.

- olsc, olsr, ols2c, ols2r functions. The first two use the QR decomposition with pivoting. The last two use the Choleksi decomposition of X'X, without pivoting.

- When printing a row vector which spans more than one line of output, labelling of elements will only be done once at the top.

- Contrary to what the documentation says, eigenvalues from a general matrix are not sorted. Those of a symmetric matrix are.

## Fixed bugs in version 1.06

- Vertical concatenation (| operator) does not work correctly when using unequally sized matrices (the wrong parts are zeroed out). Horizontal concatenation is fine.

- Deleting something twice, or a variable which wasn't assigned to could lead to a crash.