# [pstricks] another confusion about \parametricplotThreeD

Nitecki, Zbigniew H. Zbigniew.Nitecki at tufts.edu
Mon Jan 2 16:20:10 CET 2012

```Thanks---I had forgotten whether the previous example had been \parametricplotThreeD or just \parametricplot.
The example I sent this time did not have the extra jul (I wanted t^2, not t^3).

In any case, unless I am being very blind, my real question in this post is different:  why is the green curve,
coded as
\parametricplotThreeD[linecolor=green](-3,3){%
t
0
t dup t mul 36 add sqrt 3 div
}
printing in the yz-plane (x=0) instead of the xz-plane (y=0)?

Zbigniew Nitecki
Department of Mathematics
Tufts University
Medford, MA 02155

telephones:
Office    (617)627-3843
Dept.    (617)627-3234
Dept. fax    (617)627-3966
http://www.tufts.edu/~znitecki/

On Jan 2, 2012, at 9:59, Herbert Voss wrote:

Am 01.01.2012 23:31, schrieb Nitecki, Zbigniew H.:
I have a confusing situation:  the code below leads to the attached figure, which is OK except that the green curves
are supposed to be in the xz-plane (they have y=0) but instead they are in the yz-plane.  What can cause this anomaly?

BTW, can one use an algebraic notation option (instead of reverse Polish=postscript) in \parametricplotThreeD?

I already send you an example with algebraic notation

\parametricplotThreeD[linecolor=green](-3,3){%
t
0
t dup t mul 36 add sqrt 3 div
}

the same problem as in your another example, a missing mul

t dup t mul mul 36 add sqrt 3 div

use

t 3 exp

instead, then it is easier or use algrbraic noattion

Herbert
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