Scaling in only in y axis. How to do it?

I need to scale a drawing in 50% (x 1/2) but only in y values, all the x values remain the same. I usually use scale command but there are no options for scaling in just one axis.

How can I do this?

Thanks

Make a block and insert it with the appropriate scale factors

or use the attached

Scaleaxis.lsp

Thank you very much. I love this forum !!!