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postscript way to reverse a data array?

postscript way to reverse a data array?

postscript way to reverse a data array?

Is there a (simple) manner to reverse a data array in postscript?

data [1 2 3 4 5] def
(simple reverse)
yields data being 5,4,3,2,1.

I don't know postscript very well, I have been searching the blue,red, and green books for 'reverse'.  I might even be searching for the incorrect term.

The data is 400 numbers, I am currently creating postscript output via perl and am using perl to reverse the data and include it in the postscript file twice, once forwards and once backwards.  I'd like to keep the postscript file as possible, and was hoping I could include the data once and have postscript reverse it.

RE: postscript way to reverse a data array?

No, there is no "reverse" statement. You'll have to code this yourself.

I would use a "for" loop, in combination with the "length" operator.

The idea would be to retrieve items out of the array in reverse order. Keep in mind that arrays are zero-indexed. I haven't tested this, but something like:


/newArray data length array def
/newArrayIndex 0 def

data length 1 sub -1 0
  data exch get
  newArray exch
  newArrayIndex put
  /newArrayIndex newArrayIndex 1 add def
} for

Like I said, I haven't tested that, but the idea is to work backwards through the data array, and put the elements into the newArray starting at 0 and working forward.

Thomas D. Greer

Providing PostScript & PDF
Training, Development & Consulting

RE: postscript way to reverse a data array?

I'll try that.  Thanks for the direction!

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