hp 50g won't find 2-line intersect on graph



#7

I have read the large manual and everything else I could find, but when I graph two equations, I can move the cursor near any of the intersections, and it will only jump to either the x or y axis when I hit Isect, even if the intersection is far away from the axes. Am I missing something? I have even tried tracing to the point nearest an intersection and still it jumps to an axis. From reading the manual, it seems like it should be pretty simple.

Thanks for any help.


#8

What functions did you have a problem with?


#9

This is the first time I really wanted to use this feature. It was y=4-x, y=x, and y=4-3x. Nothing fancy at all. It would only go to the [0,4] intersect no matter where the cursor was. I tried it on some other random equations to see if it would find them, with no luck. I can easily calculate the intersections myself, but it says that it will find them by putting the cursor near the point and pressing ISECT. Been doing some volume rotations around the axes, so it would be nice to find them that much quicker.


I just set it up again to do the same three, and it only will give me the [2,2] intersection no matter where I put the cursor. I feel like I am just using it wrong or missing something.

Thanks,
Noah

Edited: 1 Mar 2010, 9:04 p.m.


#10

I get you are getting, Noah, the ISECT function is pointing to the same point no matter where the cursor is currently located.

Playing with the order of equations makes a difference where the HP50g decides to concentrate its "efforts". I think the ISECT works on only the first two equations listed and ignores everything else.

Eddie


#11

Thank you. That is what it seems. I have to say I am pretty disappointed with that particular command. I guess something could be programmed... ,but really, how hard is it to find an intersection point. :)

Thanks again for the insight,

Noah


#12

After finding the intersection of the first two curves, go to "Y=", select the first equation, hit "NXT", and then "move down" twice. You can now find the intersection of the next two equations.


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