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 intersection of 2 graphs
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## intersection of 2 graphs

#1
September 17th 05, 11:43 AM
 utopian_sorceror external usenet poster Posts: n/a
intersection of 2 graphs

I plotted 2 sets of data on the same set of axes.. now I need to find the
intersection point of the two trendlines. Please let me know how I can do
this (if I can)?

This is probably very trivial.. really appreciate all the help.

Thanks!
#2
September 18th 05, 10:32 AM
 Andy Pope external usenet poster Posts: n/a

Hi,

Have a look at this explanation.
http://www.andypope.info/charts/intersection.htm

Cheers
Andy

utopian_sorceror wrote:
> I plotted 2 sets of data on the same set of axes.. now I need to find the
> intersection point of the two trendlines. Please let me know how I can do
> this (if I can)?
>
> This is probably very trivial.. really appreciate all the help.
>
> Thanks!

--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info
#3
September 18th 05, 11:02 AM
 utopian_sorceror external usenet poster Posts: n/a

formula is evaluating to an error though. apparently, excel doesn't
understand what is "lineb", could you explain further pls?

also, would this method work when I'm not using line segments between data
points, but an exponential trendline for the entire set?

if it helps, i'm trying to do load line analysis of a resistor and a diode..
so I have this exponential looking graph and this straight line and I need to
find where they intersect

thanks so much! really appreciate.

"Andy Pope" wrote:

> Hi,
>
> Have a look at this explanation.
> http://www.andypope.info/charts/intersection.htm
>
> Cheers
> Andy
>
> utopian_sorceror wrote:
> > I plotted 2 sets of data on the same set of axes.. now I need to find the
> > intersection point of the two trendlines. Please let me know how I can do
> > this (if I can)?
> >
> > This is probably very trivial.. really appreciate all the help.
> >
> > Thanks!

>
> --
>
> Andy Pope, Microsoft MVP - Excel
> http://www.andypope.info
>

#4
September 18th 05, 01:32 PM
 Andy Pope external usenet poster Posts: n/a

Hi,

LineB is a named range. In the example check under the menu Insert >
Names > Define.

If you want to do intersects of a trend line then you will need to
generate some x and y values for the trendline and use those.
Use LINEST for this purpose
http://www.stfx.ca/people/blie ngme/ExcelTips/Polynomial.htm

Cheers
Andy

utopian_sorceror wrote:
> formula is evaluating to an error though. apparently, excel doesn't
> understand what is "lineb", could you explain further pls?
>
> also, would this method work when I'm not using line segments between data
> points, but an exponential trendline for the entire set?
>
> if it helps, i'm trying to do load line analysis of a resistor and a diode..
> so I have this exponential looking graph and this straight line and I need to
> find where they intersect
>
> thanks so much! really appreciate.
>
> "Andy Pope" wrote:
>
>
>>Hi,
>>
>>Have a look at this explanation.
>>http://www.andypope.info/charts/intersection.htm
>>
>>Cheers
>>Andy
>>
>>utopian_sorceror wrote:
>>
>>>I plotted 2 sets of data on the same set of axes.. now I need to find the
>>>intersection point of the two trendlines. Please let me know how I can do
>>>this (if I can)?
>>>
>>>This is probably very trivial.. really appreciate all the help.
>>>
>>>Thanks!

>>
>>--
>>
>>Andy Pope, Microsoft MVP - Excel
>>http://www.andypope.info
>>

--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info
#5
September 19th 05, 05:36 AM
 utopian_sorceror external usenet poster Posts: n/a

ok i think i get it thanks so much again.. i'll go fiddle with my data...

"Andy Pope" wrote:

> Hi,
>
> LineB is a named range. In the example check under the menu Insert >
> Names > Define.
>
> If you want to do intersects of a trend line then you will need to
> generate some x and y values for the trendline and use those.
> Use LINEST for this purpose
> http://www.stfx.ca/people/blie ngme/ExcelTips/Polynomial.htm
>
> Cheers
> Andy
>
> utopian_sorceror wrote:
> > formula is evaluating to an error though. apparently, excel doesn't
> > understand what is "lineb", could you explain further pls?
> >
> > also, would this method work when I'm not using line segments between data
> > points, but an exponential trendline for the entire set?
> >
> > if it helps, i'm trying to do load line analysis of a resistor and a diode..
> > so I have this exponential looking graph and this straight line and I need to
> > find where they intersect
> >
> > thanks so much! really appreciate.
> >
> > "Andy Pope" wrote:
> >
> >
> >>Hi,
> >>
> >>Have a look at this explanation.
> >>http://www.andypope.info/charts/intersection.htm
> >>
> >>Cheers
> >>Andy
> >>
> >>utopian_sorceror wrote:
> >>
> >>>I plotted 2 sets of data on the same set of axes.. now I need to find the
> >>>intersection point of the two trendlines. Please let me know how I can do
> >>>this (if I can)?
> >>>
> >>>This is probably very trivial.. really appreciate all the help.
> >>>
> >>>Thanks!
> >>
> >>--
> >>
> >>Andy Pope, Microsoft MVP - Excel
> >>http://www.andypope.info
> >>

>
> --
>
> Andy Pope, Microsoft MVP - Excel
> http://www.andypope.info
>

#6
October 31st 08, 08:19 AM posted to microsoft.public.excel.charting
 tinga external usenet poster Posts: 3
intersection of 2 graphs

hi,
I have the same problem. I tried to use the function in the example but it
is not working. can you explain more please.

"Andy Pope" wrote:

> Hi,
>
> LineB is a named range. In the example check under the menu Insert >
> Names > Define.
>
> If you want to do intersects of a trend line then you will need to
> generate some x and y values for the trendline and use those.
> Use LINEST for this purpose
> http://www.stfx.ca/people/blie ngme/ExcelTips/Polynomial.htm
>
> Cheers
> Andy
>
> utopian_sorceror wrote:
> > formula is evaluating to an error though. apparently, excel doesn't
> > understand what is "lineb", could you explain further pls?
> >
> > also, would this method work when I'm not using line segments between data
> > points, but an exponential trendline for the entire set?
> >
> > if it helps, i'm trying to do load line analysis of a resistor and a diode..
> > so I have this exponential looking graph and this straight line and I need to
> > find where they intersect
> >
> > thanks so much! really appreciate.
> >
> > "Andy Pope" wrote:
> >
> >
> >>Hi,
> >>
> >>Have a look at this explanation.
> >>http://www.andypope.info/charts/intersection.htm
> >>
> >>Cheers
> >>Andy
> >>
> >>utopian_sorceror wrote:
> >>
> >>>I plotted 2 sets of data on the same set of axes.. now I need to find the
> >>>intersection point of the two trendlines. Please let me know how I can do
> >>>this (if I can)?
> >>>
> >>>This is probably very trivial.. really appreciate all the help.
> >>>
> >>>Thanks!
> >>
> >>--
> >>
> >>Andy Pope, Microsoft MVP - Excel
> >>http://www.andypope.info
> >>

>
> --
>
> Andy Pope, Microsoft MVP - Excel
> http://www.andypope.info
>

#7
October 31st 08, 02:13 PM posted to microsoft.public.excel.charting
 Andy Pope external usenet poster Posts: 2,489
intersection of 2 graphs

Hi,

There is not a lot more to explain.

The user function will not work if you do not have any or all of the
following,

the code for the user defined function
macros enabled
the named ranges used in the formula specified

If you need more help you will need to explain exactly what *your* problem
is as the post you tagged on to has 2 problems/solutions in it.

Cheers
Andy

--

Andy Pope, Microsoft MVP - Excel
http://www.andypope.info
"tinga" > wrote in message
...
> hi,
> I have the same problem. I tried to use the function in the example but it
> is not working. can you explain more please.
>
> "Andy Pope" wrote:
>
>> Hi,
>>
>> LineB is a named range. In the example check under the menu Insert >
>> Names > Define.
>>
>> If you want to do intersects of a trend line then you will need to
>> generate some x and y values for the trendline and use those.
>> Use LINEST for this purpose
>> http://www.stfx.ca/people/blie ngme/ExcelTips/Polynomial.htm
>>
>> Cheers
>> Andy
>>
>> utopian_sorceror wrote:
>> > formula is evaluating to an error though. apparently, excel doesn't
>> > understand what is "lineb", could you explain further pls?
>> >
>> > also, would this method work when I'm not using line segments between
>> > data
>> > points, but an exponential trendline for the entire set?
>> >
>> > if it helps, i'm trying to do load line analysis of a resistor and a
>> > diode..
>> > so I have this exponential looking graph and this straight line and I
>> > need to
>> > find where they intersect
>> >
>> > thanks so much! really appreciate.
>> >
>> > "Andy Pope" wrote:
>> >
>> >
>> >>Hi,
>> >>
>> >>Have a look at this explanation.
>> >>http://www.andypope.info/charts/intersection.htm
>> >>
>> >>Cheers
>> >>Andy
>> >>
>> >>utopian_sorceror wrote:
>> >>
>> >>>I plotted 2 sets of data on the same set of axes.. now I need to find
>> >>>the
>> >>>intersection point of the two trendlines. Please let me know how I can
>> >>>do
>> >>>this (if I can)?
>> >>>
>> >>>This is probably very trivial.. really appreciate all the help.
>> >>>
>> >>>Thanks!
>> >>
>> >>--
>> >>
>> >>Andy Pope, Microsoft MVP - Excel
>> >>http://www.andypope.info
>> >>

>>
>> --
>>
>> Andy Pope, Microsoft MVP - Excel
>> http://www.andypope.info
>>

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