I have created a line graph from 2 columns of data which give me an ascending curve and a descending curve, what I need to try and do, if possible, is find the value at the point where the lines intersect. Could anyone please help with this...many thanks in advance
Welcome to the forum!
Will you please attach a sample Excel workbook? We are not able to work with or manipulate a picture of one and nobody wants to have to recreate your data from scratch.
1. Make sure that your sample data are REPRESENTATIVE of your real data. The use of unrepresentative data is very frustrating and can lead to long delays in reaching a solution.
2. Make sure that your desired results are also shown (mock up the results manually).
3. Make sure that all confidential data is removed or replaced with dummy data first (e.g. names, addresses, E-mails, etc.).
4. Try to avoid using merged cells as they cause lots of problems.
Unfortunately the attachment icon doesn't work at the moment, so to attach an Excel file you have to do the following: just before posting, scroll down to Go Advanced and then scroll down to Manage Attachments. Now follow the instructions at the top of that screen.
Please pay particular attention to point 2 (above): without an idea of your intended outcomes, it is often very difficult to offer appropriate advice.
Ali
Enthusiastic self-taught user of MS Excel who's always learning!
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Ok..I will attach the spreadsheet
Last edited by alanj49; 08-05-2018 at 07:13 AM.
How did you calculate it manually?
maybe this:
=SQRT(EXP(INTERCEPT(LN($B$2:$B$11),LN($A$2:$A$11)))/SLOPE($C$2:$C$11,$A$2:$A$11))
Glenn
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Temporary addition of accented to illustrate ongoing problem to the TT: Lá fhéile Pádraig sona dhaoibh
If that doesn't do it, have a look here: https://www.listendata.com/2012/10/e...curve-and.html
There is a formula for calculating the resonant frequency, the purpose of the graph method is to prove that by using formulas and raw data you can get to the same point as when using the resonant frequency formula. If possible I would like to show the value where the points intersect to prove the accuracy.
See posts #5 and #6.
Hi, the first one worked a treat and matches the calculated figure exactly. That also proves that I did the calculations for the raw data correctly too.
Many thanks for your prompt assistance
You're welcome.
If that takes care of your original question, please select "Thread Tools" from the menu link above and mark this thread as SOLVED.
It'd also be appreciated if you were to click the Add Reputation button at the foot of any of the posts of all members who helped you reach a solution.
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