HP Forum Archive 19

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unable to plot UTPN Message #1 Posted by stroran on 19 Apr 2010, 11:57 a.m. Hi, Plotting the function << -> X << 0 1 X LN UTPN >> >> leads to an error message: "UTPN Error: Bad Argument Type". Any suggestions as to why this is happening? When I store the function above in a variable V and enter it in the command line, it evaluates to a number just fine, e.g., V(1) EVAL leads to 0.5 as expected. But when I use V(X) as the function to be plotted it complains as described above. This issue is related to having the function LN(X) as the argument to UTPN. Do I need an extra step to make sure LN(X) evaluates to whatever datatype UTPN takes? Thank you very much for your time.

Re: unable to plot UTPN Message #2 Posted by Tim Wessman on 19 Apr 2010, 6:48 p.m., in response to message #1 by stroran If you are in approximate mode, then you should be fine. If not, add in a ->NUM right before the UTPN. TW

Re: unable to plot UTPN Message #3 Posted by stroran on 20 Apr 2010, 5:00 a.m., in response to message #2 by Tim Wessman Thanks Tim. Unfortunately, I can't still get it to plot even with ->NUM. The funny thing is that << -> X << 0 1 X COS ->NUM UTPN >> >> or << -> X << 0 1 X EXP ->NUM UTPN >> >> plot as expected. However, << -> X << 0 1 X LN ->NUM UTPN >> >> or << -> X << 0 1 X LOG ->NUM UTPN >> >> refuse to plot giving "UTPN Error: Bad Argument Type". Do log functions need to be treated differently? I have an HP50g.

Re: unable to plot UTPN Message #4 Posted by Kiyoshi Akima on 21 Apr 2010, 12:10 p.m., in response to message #1 by stroran What's your plot range? Can x be negative? Then ln(x) is complex, and UTPN doesn't like complex numbers.

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