How to create a gradient with a square fill (pyramid gradient)

I'm looking for the best way to this:
http://www.filterforge.com/wiki/index.php/Square_Gradient
Any input is appreciated. Thank you.

Thank you for the replies. I did do this, saved as a PDF and checked the file Acrobat. Acrobat seems to only recognize full percentage screens? The transition of the gradient screen went from 9 down to 1, except it only showed whole numbers. It looked fine on screen. Then, I placed the file in InDesign so we could step it properly for the presses. After this, I exported the file as a PDF. Now, the screen transition in Acrobat read as 9,8,9,8,7,8,7,6...and so on. I assume this has to do with the blending, but the straight save as a PDF from Illustrator didn't have the differing sequences for screen gradients. Both looked fine on screen and appeared to have a visually smooth transition; however, when we output the film, the transition on the negative didn't look smooth whatsoever. A press test confirmed this. Now, I may just step the file in Illustrator and hope this makes a difference.
Are there any suggestions how to make the transition smoother? Should I apply more steps? I used 50.
Again, to sum up: On screen the gradient trasition looks smooth, but on the negative and on print, it looks bad. Also, why does Acrobat using the object inspector screen only show whole number screen percentages? We work with gradient screents constantly and never had I had a square gradient like this. I hope it's not something more technical with the RIP software and line screens.
Thanks again.

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