<div dir="ltr"><div class="gmail_extra">Looking at the git logs, column_stack appears to have been that way (creating a new array with concatenate) since at least NumPy 0.9.2, way back in January 2006:</div><div class="gmail_extra"><a href="https://github.com/numpy/numpy/blob/v0.9.2/numpy/lib/shape_base.py#L271">https://github.com/numpy/numpy/blob/v0.9.2/numpy/lib/shape_base.py#L271</a><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Stephan</div></div>