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Student Support Forum: 'Re: Plotting x^(1/3)' topicStudent Support Forum > General > Archives > "Re: Plotting x^(1/3)"

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George Marrash
05/19/97 7:09pm

Here is what i did and I to got only the graph for positive values
of x, eventhough mathcad plotted the function with no problem In[1]:=
\!\(Plot[x\^\(1\/3\), {x, \(-10\), 10}]\) \!\(Plot::''plnr'' \( :
\ \) ''\!\(x\^\(1/3\)\) is not a machine-size real number at \!\(x\)
= \ \!\(-9.99999916666666699`\).''\) \!\(Plot::''plnr'' \( : \ \)
''\!\(x\^\(1/3\)\) is not a machine-size real number at \!\(x\) =
\ \!\(-9.18866016854168421`\).''\) \!\(Plot::''plnr'' \( : \ \) ''\!\(x\^\(1/3\)\)
is not a machine-size real number at \!\(x\) = \ \!\(-8.30382400281252586`\).''\)
General::''stop'': ''Further output of \!\(Plot :: \''plnr\''\) will
be suppressed during this \ calculation.'' this is strange Reply to
message #359 from Ben Hawkey: > I just know this has a really simple
answer, but it has been bugging me that I have been unable to get
a real result for -ve values of x. I know they exist, my $50 calculator
tells me they exist. and so does my 1st year calc book, but I'll be
damned if I can get Mathematica to give me anything but complex results.
> So if anyone can answer this easy question for me I'd be very happy
:) > > Thanks in advance > Ben Hawkey >


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