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)
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.
When using an axe the handle of the axe acts as a leveler allowing you to increase the force at the cutting edge, when you are not using the full length of the handle, you're choking the axe.
590 views
Usually answered in minutes!
×