polynomial

  1. S

    Linest not working - Polynomial Trend

    hello all, I am trying to use excel to make polynomial trend (2ª order) of given data. Linest function is returning "#VALUE". xls file in attach: https://ufile.io/6c91i thanks in advance
  2. J

    Converting Polynomial equation

    Hi, I fit a polynomial line to a chart and got the following equation: -5E+06x^2 + 7E+07x + 1E+08 How do I use this as a formula in a cell? Thanks Jeff
  3. S

    Trendline Equations - Can't Get *Future* Values from 3rd Order Polynomial

    Hi All, For several years now I've used the formulas from this page: http://spreadsheetpage.com/index.php/tip/chart_trendline_formulas/ ..to great success with easier equations like Linear & Power. However I've now tried 3rd order polynomial and I've run into a distinct problem. I can get...
  4. K

    Use Polynomial Equation to Forecast x values for Known y Values

    Dear All, please can anyone help me with this question. I have a series of 5 known y values and five known x values. I have used the Excel in-built charting facility to plot a line graph / curve for these values, and have added a polynomial trend line projecting 6 further y values for a further...
  5. C

    VBA/UDF to find real roots of a 6th degree polynonial equation.

    Can anyone please help me or point me in a direction? I am trying to find the real roots of the equation below using VBA/UDF in excel. Thanks in advance. Equation: y= x6 - 7x5 + 4x4 - 14x3 + 12x2 - 5x + 23 = 0
  6. S

    Multivariate Polynomial LINEST with Macro

    I've dug and dug, but I can't find out to use the LINEST function to calculate the polynomial fit for multivariate data in a macro independent of the worksheet. To be clear, I have found out how to do multivariate-polynomial fits in the worksheet, I just haven't figured out how to do this in a...
  7. S

    Pulling Constants from a 3rd Degree polynomial Graph

    Hello, I have a spreadsheet where I input values and then these values are graphed into a 3rd degree polynomial. The equation of the polynomial is displayed on the graph. I'd like to make it to where the values of the constants are transcribed into separate cells. I've put the spreadsheet...
  8. R

    Finding roots of polynomials

    Is there a code to program an excel spreadsheet so that if someone typed in the coefficients for a polynomial of up to 4 exponents, excel would be able to find the roots? For example: f(x)=x^3+9x^2-4x-36 I would plug 1, 9, -4, -36 into excel and the roots -2, 2, and -9 would show up in the cell
  9. D

    Extracting data from Polynomial regression equation

    Hi all, Apologies if this question seams disjointed but I am having trouble organising my thoughts. I've decided just to put what I can into words a hope someone can help. I have a cumulative data set as follows. I have graphed this data and created a 3rd order polynomial regression equation...
  10. S

    Trendline - coefficient of a polynomial

    Hello, I have a set of experimental data. I'm using the option trendline to fit a polynomial regression curve. I can retrieve the equation by selecting "Display Equation on chart" then copy/paste to insert the equation in the worksheet and manipulate to extract the coefficients: example: y =...
  11. M

    4th Order Polynomials - Please Help!

    Hi guys, I'm having a lot of trouble with a spreadsheet I need to make for work. Essentially a test we carry out involves plotting 4 or 5 points on a chart, placing a polynomial trendline and reading the maximum y value from the curve. To simplify this, I've successfully written formulas that...
  12. C

    Polynomial Trend Line

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  13. P

    Solver Root

    I created a trendline and associated equation for some data plotted against Time on the x-axis displayed in MM/DD/YY format. The date for the data ranges from 3/27/06 thru 11/10/08. The trendline equation is… F(x)=-6E-13x^5+1E-07x^4-.0087*x^3+329.1*x^2-6E+06*x+5E+10 The data actually crosses...
  14. C

    Polynomial Regression Equation Formulas?

    I know you can view various trend lines in Excel by adding a trend line to an existing chart. Furthermore, you can view the formula on the chart which provides the equation that describes the tend line shown. Background: In my model, I'm trying to identify numerous (50+) unique polynomial...

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