Polynomial Function
Feb 9, 2010
I have plotted a graph which compares the miles done with the petrol used.
I'm trying find a formula which allows me to apply the petrol and would give me the miles covered.
From excel I have applied the tread line of polynomial and obtained the following formula...
y = 1E-06x5 - 0.0002x4 + 0.0161x3 - 0.4893x2 + 7.5295x - 20.87
R˛ = 0.9989
When is it applied to excel with the value of petrol it does not give me the miles.
I'm working out the formula in a incorrect manner?
I have attached the excel file.
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Mar 9, 2007
I have a VBA function that calculates polynomial coefficients for a series of data pairs. One selects the range of cells that the coefficients are to be stored in, and enters the polynomial formula:
{POLFIT(Xa, Ya, N)}
Where Xa is the array of ordinate values, Ya is the array of data values, and N is the polynomial order to be fit.
It is obvious that one needs to select at least N+1 cells when the array funtion is typed in. But, it is easy to select too few cells.
I am looking for a way to test whether enough cells were selected for the range formula: The function declaration is
Function POLFIT(Xa, Ya, N As Integer) As Variant
Various means I have tried to count POLFIT do not return the correct value.
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Apr 10, 2012
I have quite a number of 4th degree polynomials and attempting to extract the variables from every equation. I used the formula below (from another thread);
=LOOKUP(99^99,--("0"&MID(A1,MIN(SEARCH({0,1,2,3,4,5,6,7,8,9},A1&"0 123456789")),ROW($1:$10000))))
but it only extracts the first variable.
4th degree polynomial function: f(x) = ax^4 + bx^3 + cx^2 + dx + e
Example of one of the equations: Y = -42.4276 + 319.989 X - 809.094 X^2 + 942.247 X ^3 - 397.587 X^4
I'll like to have the final result like below (Based on the Example equation above)
edcba-42.4276319.989-809.094942.247-397.587
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May 14, 2006
y = 1.083333333x4 - 7.3333333x3 + 16.416667x2 - 6.16667x + 4
Above is the polynomial equation of a trend line as shown on my chart, I have extracted the numbers into separate cells using LINEST, so now I have in cells A20 to E20 the numbers 1.083333333, -7.333333, 16.416667, -6.16667 and 4 respectively.With a "y" value of 25 how do I go about solving for a value of "x".
I've been stubbornly struggling with this on and off for a couple of weeks now and I'm not getting any closer to working it out and the websites I've found explaining the procedure all seem to go over my head by the time I get into the fourth or fifth paragraph.
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Jul 31, 2008
I have this data:
x y
310 516
320 526
325 535
330 587
335 640
340 715
345 857
350 1040
When I perform a third degree polynomial curve fit I get this equation:
y = 0.0106x3 - 10.0266x2 + 3152.3381x - 329943.8370
R2 = 0.9987
Which isnt right. On a calculator, I get negative numbers. Does excel have problems with 3rd degree polynomials?
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Sep 7, 2009
For Excel 2007 -
I am looking for a function [or method] to calculate a polynomial curve fit. I can do it on a graph with the existing graph and chart tools, but I need to calculate it myself. Does such software exist somewhere in my Excel 2007 package, or can anyone recommend a freeware program? I am hesitant to download an unknown, un-recommended add-in.
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Nov 21, 2008
The functions of trend lines in charts are nice, but the coefficients of the output equations are all with only one-digit for the polynomial fits. The single-digit fits by the fitting equations often result in higher deviations from what we have seen in the charts.
I also tried to use the statistical functions but it seams that I cannot get any outputs of these coefficients except for the slope of LINEST, which is not sufficient for polynomials.
I also use addins such as as regressions but cannot get anything either to help for these coefficients.
May someone tell me how to make such outputs with more digits so the equations can be more precisely fitting please?
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Feb 16, 2007
I don't actually own Excel as yet - but I'm wondering if someone could tell me whether Excel is capable of solving what I'm told are 'polynomial equations'. An example of the sort of equation I hope to solve is: d/(1.18 + d) + d/(1.86 + d) + d/(9 + d) + d/(8.8 + d) = 2
d=? {I happen to know d = 3.65(approx) in this example btw}
Often there will be many more than four terms...
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Jan 20, 2014
I'm familiar with 2d graphs, trendlines, and regression equations. Now I have some tabular data that has 2 input variables and a result. As with my 2d data, I would like Excel to create a polynomial equation of z from the x and y inputs. Can Excel do this, or do I need a plug-in or another software package?
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Feb 8, 2010
I am trying to do multivariate polynomial regression in excel, trying to correlate data of the form y=f(x1,x2) with second order polynomials:
Y = c + a1*x1 + a2*x1^2 + a3^x1^3 + b1*x2 + b2*x2^2 + b3*x2^3
Using the following command, I have achieved this:
=LINEST(A2:A10,B2:B10^{1,2,3,0,0,0}*C2:C10^{0,0,0, 1,2,3},TRUE,TRUE)
theory Excel uses for this kind of regression?
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Jul 17, 2014
i have a function in a cell (that works) to extract coefficients from a range of cells in a workbook:
VB: =INDEX(LINEST(CP25:CP27,CQ25:CQ27^{1,2}),1)}
i have variables for cp25:cp27 and cq25:cq27 already defined in my vba code. the values for these in the case i am working on are as follows (returns 110.5):
cp25 = 560
cp26 = 570
cp27 = 580
cq25 = .414
cq26 = .479
cq27 = .536
1) how to do this function in VBA only - this is part of a UDF and cannot have any helper cells
2) how to refer to 560,570,580 as a 'range'. is there a way to put these six variables into my ranges for later processing?
All of the google searches i have deal only with linear regression, taking from existing graphs, or say to just use the function i have above.
I have tried
VB:
Var = Application.WorksheetFunction.LinEst(Sheets("references").Range("CP25:CP27"), Sheets("references").Range("CQ25:CQ27^{1,2}"), 1)
[COLOR=#333333][/COLOR]
but return #value! errors. when i remove the ^{1,2} portion, i do return a value but it is incorrect (returns 160), what is the correct syntax for adding in the ^{1,2}? if you do that would be fantastic, but brings me back to issue #2 in that i need to refer to my variables in the vba code and not this range (as they will eventually be going away).
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Apr 8, 2014
I'm having trouble using the worksheet copy command in a VBA subroutine. I have the following line in my code:
[Code] ........
When I step through my code and execute this line, the sheet is copied as expected and put in the correct place, but then instead of the next line of code being highlighted, the pointer jumps to the first line of a function (in a different module) in my code.
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Mar 20, 2009
Another interesting dilemma to solve. Using this formula:
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May 14, 2013
Function Haversine has correct value in debugger but in cell it has the same value as Haversine2. Is this a known bug?
Public Function Haversine(lat1 As Double, long1 As Double, lat2 As Double, long2 As Double) As Double
Dim temp As Double
[Code]....
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Apr 13, 2007
In Mr Excel's Pod Cast on April 12th, he showed how to use the OFFSET function to define a range inside a SUM function. Then he had Conditional Formatting that would highlight the range that was being summed. Can anyone tell me what the formula would be inside the Conditional Formatting dialog box to get the OFFSET range to have a certain format?
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Jul 23, 2013
I have a function
VB:
Function f1(Matrix As Range)
'Does something and returns f1 = a double
End Function
And a second function which defines and constructs a matrix of doubles to use as an argument in f1 to return a double:
VB:
Function f2(dD As Double)
Dim MatrixRed() As Double
Redim MatrixRed(1 To dD, 1 To 10)
For i = 1 To dD
For j = 1 To 10
MatrixRed(i, j) = i * j
Next
Next
f2 = f1(MatrixRed)
End Function
I get an output error (#VALUE). I think it has something to do with MatrixRed not being a range anymore?
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Dec 3, 2013
let me start by saying that I know an example workbook would be useful here, but the part I'm struggling with is the [managementroster.xlsm] file, and there is A. no way I can release it to the internets and B. its so huge/complicated I couldn't even begin to reproduce a portion of it, scrubbed of data, and hope to maintain its functionality in a meaningful manner.
[Code]....
This formula checks a staff number on this spreadsheet, and then goes and looks at the staff number on the roster. Once found, it returns that staff members roster, but changes any manager codes in the MRC list to Mgr, and changes all other roster codes to Free.
I now need this formula, before altering roster codes to Mgr or Free, to only return codes that are a match for another table (or after really. I don't particularly care, so long as only codes are shown that match data from another table). I think an index/match function would do the trick, but this forumula is already at the edge of my excel ability, nesting another function within it is completey beyond me. The relevant cells for the index/match function would be:
This first Match function targets the column. $E3 is the date required, $BA$1:$DN$1 is the range the dates are entered in
Match: Lookup value = $E3
Lookup array = '[ManagementRoster.xlsm]Vacancies!'$BA$1:$DN$1
match type = 0
This second Match function targets the row. $A$4 is the department name, $B$434:$B$452 is the range where all departments are entered
Match: Lookup value = $A$4
Lookup Array = '[ManagementRoster.xlsm]Vacancies!'$B$434:$B$452
match type = 0
Index: array = $BA$434:$DN$452
So I think my final function is
[Code] .....
But I have absolutely NO idea where it would fit within my first formula, or how to code it so that my original formula only reproduces results that are found in both sheets, or anything.
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Jul 17, 2008
I have created a List in excel of various tasks. (See attached example.) Each row contains one cell with a function which equals the cell above it and to the right. So the function for cell C3 would be D2. The only importance is that the cell mirrored is always the cell one above and to the right. However, now I would like to be able to rearrange this List, but the “one up and to the right” function will now be all over the place.
Is someone aware of a function which will target a relative location instead of an exact cell?
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Nov 25, 2008
I keep getting the "You've entered too many arguments for this function" error.
Here is the formula:
=IF(B15=D40,E40,"",IF(B15=D41,E41,"",IF(B15=D42,E42,"","Invalid Shipping option")))
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May 13, 2013
I am trying to nest an IF function with a CEILING function. If C10 is < 3.5, make it 3.5, however, if C10 > 3.5, CEILING (C10, 5)
right now it looks like:
If (C10
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Mar 2, 2008
I have been looking around have this much code from this site, modified. What I am trying to do is calculate numbers by a position with cells D through K having numeric values. I have 'hardcoded' the cells (D2, E2, etc in the code below), but in reality I only want the current row (so if the formula is on the 2nd row, I want D2, if it is on the 3rd row, I want D3).
My problem is obviously the formula isn't working because I am not correctly tying back to the spreadsheet (Positioncalc.xls). When I put the formula in the spreadsheet it works, but in my script I get 0 everytime.
My Script:
Function Position(rCell As Range, Optional RightPosition As Boolean)
Dim vResult
Select Case rCell.Text
Case "QB"
vResult = (2*D2) + (2*E2) + (2*F2) + (4*G2) + (2*H2) + (1*I2) + (4*J2) + (3*K2)
Case Else
vResult = "Invalid Position"
End Select
If RightPosition = True Then
Position = vResult
Else
Position = "Position not valid"
End If
End Function
So, when I put =Position(A2,True) I expect to see the formula results of those cells calculated based on the position (QB, HB, etc with their unique formulas).
My next challenge after this is to highlight certain cells based on the Position. So if A2 = QB, I want cell D2 boldface and Red, etc. I have seen some scripts on colors and such here, so I might be able to figure it out.
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Mar 26, 2009
I have a range of cells, for this example I will use 2.
Cell E17 = 77/170
Cell E18 = 8/9
Using the following formula: =SUM(RIGHT(E17,FIND("/",E17)))+SUM(RIGHT(E18,FIND("/",E18)))
This bring back an #VALUE! Error as the second part of the formula keeps picking up "/9" however the first part works fine, displaying "170"
Now if I use:
=SUM(RIGHT(E17,FIND("/",E17)))+SUM(RIGHT(E18,FIND("/",E18)-1))
It all works. The problem is that I need this to be automatic using the above way means having to add a "-1" to every formula for a cell with only 1 char to be added.
Using the formula:
=SUM(RIGHT(E17,FIND("/",E17)-1))+SUM(RIGHT(E18,FIND("/",E18)-1)).....
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Nov 19, 2009
I have a tracking sheet (attached) that has many functions, but I'm having trouble with two of them. First of all, I have a Worksheet_Change event set that when a cell is cleared, it fills the cell with a formula to use the record above it as a default value if another cell is equivalent. This worked when I first wrote it, but now it seems to break every other time I use it. When assigning the formula it returns a Method Default/FormulaR1C1/Offset failed error message. It seems to be different for each one, each time and I can't figure out what the problem is.
The other problem I'm having is that I wrote a BeforeDoubleClick event to expand or contract any given record, or series of records. this too worked when I initially wrote it, but now is only hiding one row when it should be hiding eight or more.
I'm not terribly versed in VBA and totally baffled as to why I'm having these problems. As I side note, any ideas to clean up any of the code and make this run smoother (as ther will be many more series added when complete).
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Sep 24, 2012
I have a user defined function in one VBA module that I'd like to call from another module, so I would normaly scope it as "Public".
However, as I don't want it to be available to Excel as a worksheet function, I would also normally scope it as "Private"
Is there a way to have a function that is available to other VBA modules in the same project, but not to Excel as a worksheet function?
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Sep 14, 2006
A most of time I'm using VLOOKUP function. I want to call specially this function by pressing custom button (w/o pressing "Insert Function" and choosing VLOOKUP)
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Oct 9, 2007
when you type in a builtin function in the formula bar such as =DAY(), a small callout box appears below telling you the syntax - in this case "DAY(serial_number)". Is it possible to achieve this for a user defined function?
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Sep 16, 2009
I have written a VBA program and using in Ms.Excel. The problem is when I try to write the VBA function through the function wizard it works but when I write the function in excel worksheet cell, it doesnt execute. I do not now the reason.
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Oct 26, 2008
I am trying to use the vlookup function together with an offset function but i am not getting it to work properly.
The situation is as follows:
I have a column E in which i use the vlookup function to find its corresponding value in B which in turn refers to a named range. However, the figure i want the function to return is 2 columns to the right and 2 rows above the value which the vlookup funtion finds in the first column.
I have though of using the offset function, but i cannot figure out how to make this work.
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Nov 11, 2008
I'm comfortable with the IF statements in excel and not familir with many of the other functions available to me. I am trying to create a character calulator for Elder Scrolls III (Marrowind). So that a person may enter their race, ***, and other choices and their by calculating all starting stats. There are 10 races you can choose from and I can cover 9 of them with the if function (leaving one as if all other options are false). I would like to know if there is a better way such as a drop down list or some way to search an array or anything that would be better suited to search the race cell and return data if it's true. I'm running into the same probably with choosing the constalation (13 choices in this catagory).
I thought to split it two different data fields, by letting you choose from 4 in one cell and the other 9 in a different cell, but realized I don't know how to make it check two different cells for a choice to return it to the display cell without hitting the limitation of the 7 nested funcations in a forumla again.
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Dec 23, 2011
I am using the COUNTA function which works great but I also have data that I dont want counted and do not know of the problem solver.
E.G
in B1 I have vlookup function thats brings back either "B", "C" or "M".
in c1 I have =IF(A1="C",B1,"")
Now, that tells me if the data is B or not. If it is, it says B If it isnt, its blank
Thats great but when im trying to count how many "B"'s there are, it counts the blanks as well!
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