Posts: 2
Threads: 1
Joined: Apr 2010
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.
Posts: 1,278
Threads: 44
Joined: Jul 2007
If you are in approximate mode, then you should be fine. If not, add in a ->NUM right before the UTPN.
TW
Posts: 2
Threads: 1
Joined: Apr 2010
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.
Posts: 325
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Joined: Jul 2006
What's your plot range? Can x be negative? Then ln(x) is complex, and UTPN doesn't like complex numbers.