Question about Texas Instruments TI-89 Calculator

# What is the meaning of the error "invalid axes"?

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This is problem with graphing differential equation. Invalid Axes error occurs if Axes=TIME or if t(time) is set as a CUSTOM axis. This is important to noticed: if Fields=DIRFLD you cannot plot a time axis. See captured image:

This graph represented differential system of equations y1'(x)=y2(x), y2'(x)=-y1(x) for initial conditions y1(0)=0, y2(0)=-1.Finally, x axes=y1(x) and y axes=y2(x)

Posted on Feb 10, 2012

• Stevan Milanovic Feb 10, 2012

Of course, when resolved this system by hand we obtained y1(x)=sinx and y2(x)=cosx

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I checked the manual and could not find an error message invalid Axis. I did find invalid ans(). This message is displayed if you used ans(1) after an erroneous result.

Posted on Feb 09, 2012

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Posted on Jan 02, 2017

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This is problem with graphing differential equation. Invalid Axes error occurs if Axes=TIME or if t(time) is set as a CUSTOM axis. This is important to noticed: if Fields=DIRFLD you cannot plot a time axis. See captured image

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