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[80% Discount] Excel VBA Course - From Beginner to Expert

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Biexponential Trend Or Fit

Hello experts!

I need your help with calculating the parameters of biexponential (two term exponent) fit of my data. Or in other words, getting the parameters of a biexponential trendline of my data, known to be following this equation:

y= A1*e^(b1*x) + A2*e^(b2*x)

I am more interested in the b1, b2 parameters, if that helps.
The data is in a few hundred rows in two columns (x & y).

Excel seems to only give parameters of a simple exponential fit, e.g.

y = 5e^-0.66x , or y=A*e^(b*x)

I have even failed to find an Excel add-in to do the job.

Will greatly appretiate it if you could dedicate your time to solve this problem!

Thank you,
Ben


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Similar Topics







Hi peeps

I want to combine data from several worksheets into one worksheet.

For example, I have data in Sheet1 (Columns A,B,C), data in Sheet2 (Columns A,B,C), data in Sheet3 (Columns A,B,C) all with varying amounts of rows. (All the rows contain text data).

I need to combine all of the data from the 3 sheets into a single sheet, Sheet4 (Columns A,B,C), eliminating the empty rows.

I've been looking into this for a while, and can't find anything that really helps. Anyone got any pointers of what to look into?

Any help will be beautiful.

Cheers



I am using below code, but it only untill 19,999. Amount from 20,000 and above only show thousand? Please help!

For 19,999 it show
Ringgit Malaysia : Nineteen Thousand Nine Hundred NinetyNine Only

For 20,000 and above it show
Ringgit Malaysia : Thousand Only

Code as below:

Function SpellNumber(amt As Variant) As Variant
Dim FIGURE As Variant
Dim LENFIG As Integer
Dim i As Integer
Dim WORDs(19) As String
Dim tens(9) As String
WORDs(1) = "One"
WORDs(2) = "Two"
WORDs(3) = "Three"
WORDs(4) = "Four"
WORDs(5) = "Five"
WORDs(6) = "Six"
WORDs(7) = "Seven"
WORDs(8) = "Eight"
WORDs(9) = "Nine"
WORDs(10) = "Ten"
WORDs(11) = "Eleven"
WORDs(12) = "Twelve"
WORDs(13) = "Thirteen"
WORDs(14) = "Fourteen"
WORDs(15) = "Fifteen"
WORDs(16) = "Sixteen"
WORDs(17) = "Seventeen"
WORDs(18) = "Eighteen"
WORDs(19) = "Nineteen"

tens(2) = "Twenty"
tens(3) = "Thirty"
tens(4) = "Fourty"
tens(5) = "Fifty"
tens(6) = "Sixty"
tens(7) = "Seventy"
tens(8) = "Eighty"
tens(9) = "Ninety"

FIGURE = amt
FIGURE = Format(FIGURE, "FIXED")
FIGLEN = Len(FIGURE)

If FIGLEN < 12 Then
FIGURE = Space(12 - FIGLEN) & FIGURE
End If

If Val(Left(FIGURE, 9)) > 1 Then
SpellNumber = "Ringgit Malaysia : "
ElseIf Val(Left(FIGURE, 9)) = 1 Then
SpellNumber = "Ringgit Malaysia "
End If

For i = 1 To 3
If Val(Left(FIGURE, 2)) < 20 And Val(Left(FIGURE, 2)) > 0 Then
SpellNumber = SpellNumber & WORDs(Val(Left(FIGURE, 2)))
ElseIf Val(Left(FIGURE, 2)) > 19 Then
Ntow = Ntow & tens(Val(Left(FIGURE, 1)))
SpellNumber = SpellNumber & WORDs(Val(Right(Left(FIGURE, 2), 1)))
End If

If i = 1 And Val(Left(FIGURE, 2)) > 0 Then
SpellNumber = SpellNumber & " Crore "
ElseIf i = 2 And Val(Left(FIGURE, 2)) > 0 Then
SpellNumber = SpellNumber & " Hundred "
ElseIf i = 3 And Val(Left(FIGURE, 2)) > 0 Then
SpellNumber = SpellNumber & " Thousand "
End If
FIGURE = Mid(FIGURE, 3)
Next i

If Val(Left(FIGURE, 1)) > 0 Then
SpellNumber = SpellNumber & WORDs(Val(Left(FIGURE, 1))) + " Hundred "
End If

FIGURE = Mid(FIGURE, 2)

If Val(Left(FIGURE, 2)) < 20 And Val(Left(FIGURE, 2)) > 0 Then
SpellNumber = SpellNumber & WORDs(Val(Left(FIGURE, 2)))
ElseIf Val(Left(FIGURE, 2)) > 19 Then
SpellNumber = SpellNumber & tens(Val(Left(FIGURE, 1)))
SpellNumber = SpellNumber & WORDs(Val(Right(Left(FIGURE, 2), 1)))
End If


FIGURE = Mid(FIGURE, 4)


If Val(FIGURE) > 0 Then
SpellNumber = SpellNumber & " And Cents "
If Val(Left(FIGURE, 2)) < 20 And Val(Left(FIGURE, 2)) > 0 Then
SpellNumber = SpellNumber & WORDs(Val(Left(FIGURE, 2)))
ElseIf Val(Left(FIGURE, 2)) > 19 Then
SpellNumber = SpellNumber & tens(Val(Left(FIGURE, 1)))
SpellNumber = SpellNumber & WORDs(Val(Right(Left(FIGURE, 2), 1)))
End If
End If
FIGURE = amt
FIGURE = Format(FIGURE, "FIXED")
If Val(FIGURE) > 0 Then
SpellNumber = SpellNumber & " Only "
End If
End Function


We have a number of Excel users in our office who cannot copy and paste
between Excel workbooks. They can copy and paste between worksheets. When
you highlight the section to copy and then go to the new workbook both the
paste
and paste special are "grayed out". This is true whether you right-click the
mouse, go to the edit menu, or use control keys. This occurs with any data
type and the most simple workbooks. I have seen some suggestions here but
none have worked for this particular problem. I have reset the menus and
renamed the .xlb files and neither helps. You can open the clipboard and the
paste will work, but there is no paste special option. Any help would be
greatly appreciated. Thanks!




I would like to copy a small table from Word into one cell in an Excel
worksheet. The first column of the table is a list of numbers. I tried
converting the table into text with manual line breaks and tab stops to
divide columns and rows, but that didn't solve my problem.

Excel pastes the data into several rows. When I try to merge them, I
get a warning that the selection contains multiple data values, and
merging into one cell keeps the upper-left most data only.

What I tried that didn't work:
* Formatting the Excel cells as text before pasting the data.
* The various options for "Paste Special." The closest I got was
inserting the table as a Document Object, which could be a workaround,
I guess.
What I am saving for when all else fails:
* The obvious solution of copying row by row into one Excel cell.

The data in the table is information about my dad's medications. I
would like to have reference charts of how to identify the strength of
each tablet by its color and markings. I got the info from the
manufacturers' websites and entered it into tables in Word, which I
would like to copy into a more comprehensive file I am creating in
Excel. The first column of each table is the strength of the tablet,
entered as 1 mg., 2 mg., etc. The subsequent columns describe the
shape, color, and markings. There are 3 tables, each with about 4-5
rows.

Is there a way to copy each one - whether as a table or as text - into
a single Excel cell without losing data?

Many thanks.




Ran into a problem I've never seen before. When dragging a cell across that contains a sum equation the result was the following cells with the same value. Inside the cell it showed what would be the correct new equation, but the value was still from the original cell. Any ideas on what's causing this?

If I double click the cell and then hit enter it will re-total the area and then give me the correct value, but I'd obviously rather is just work right the first time.


Could you guide me please....

I need to insert 5 blank rows repeatedly between every existing data rows
for approximately 300 rows.

If I go about doing the repeat short-cut "Control+Y", it just repeats
inserting ONE row only between the consecutive data row.

Is there some command, which helps me highlight all the rows & allows me to
insert 5 blank rows between every consecutive existing data row?

Thanks in advance for your kind advice.



Ok, I'm going to try and explain this. I am going to have 5 data points in cells such as A2:A6

All I need is to know if there is an upward trend or downward trend of the numbers.... I can't have something that simply takes the first and last number and checks if it's higher or lower. I need to actually see if they are trending upwards. Also how would i go about making it so that if they are trending upwards it shows an up arrow, and down arrow for downwards...

And finally, if the trend continues at the same rate, how long it will take the number to reach a goal. Each data point will be 1 week apart, with an ultimate goal needed to be achieved at the end.
This will be a completely separate formula on the sheet....

Any help?


Hi there. I'm using Excel 2007 and often use filters to find inconsistent data (mis-spellings, etc.) and then clean up the data using the fill handle to fill in correctly formatted values. I'm finding that, with a simple filter on, dragging over cells hidden by the filter changes the values in the hidden cells too. This is something I don't remember from my last version of Excel. I'm wondering if I've mis-remembered how this control works, or if there is a setting I can't find.

My goal is to drag and fill (or paste) in a colum with a range of rows wiht some hidden (filtered out) rows, and have the filtered out data be unaffected, if that makes sense.

Thanks!

T


This is my first post in these forums.
I am trying to create a formula which will look at the data in columns A - I (50 rows) and copy this data to columns K - S but ignoring any blank cells. Thereby consolidating the data in the upper rows with no spaces.
I am sure there is a relativley simple answer but it is driving me mad!
Hope you "Guru's" can help

Thanks

Added example spreadsheet to aid assistance.


I am trying to calculate time based off a non-conventional quarter hour time system

example;
8:00 to 8:07 = 8.0 hrs
8:08 to 8:23 = 8.25 hrs
8:24 to 8:38 = 8.5 hrs
8:39 to 8:53 = 8.75 hrs
8:53 to 8:59 = 9.0 hrs

I am having trouble writing an equation that would sum the clock-in and clock-out times (2 per day) and display the total time in these quarter hours and adding an additional hour if it is >= to *:53. Any help would be great.


I want to add data points to the scatter plot that are not part of the data
ie. add points to find their concentration on a standard curve.



In Excel I have been trying to find an easier way to calculate a time
difference where the times cross midnight. Example:
Start time: 23:50:00
End time: 00:15:00

How would you formulate an equation to determine the duration of time or
differnce between the start and end time?



Is there a way to force Excel to stop calculating a formula?
Excel showing "Not Responding" and is grayed out. I've tried to use Task Manager to stop the application, but as soon as open up Excel it goes right back to opening the spreadsheets and starts calculating again. I have spreadsheets saved, so don't have to recover.
thanks...Dean


I am looking for the code to select the visible data after applying a data filter. Actually I know how to select the data after applying the data filter but the issue is I am not able to exclude the header row and give the target range as used (non-blank) rows only!!

I am using below code to Select the Visible rows in the target range:

Code:

Range("A:p").SpecialCells(xlCellTypeVisible).Select


Problems in this code a

1) after applying the filter, while selecting the data it is selecting all the rows in given range till last row on the workbook. I need this to select the the data only till the last used row in the given range.

2) It is not possible to provide the address of the first row after we apply the filter since the first row address may change depending on the values in the table.

E.g. 1st time when I am running the macro the first row in the visible filtered data is starting at Cell address A4 and next time when I will run the macro it may be A6

3) The Code is also selecting the 1st row which is a header row. How can we exclude it from selection.

Some one please revert with the solution.
Thanks in advance.


Hi-

I am brand new to Mr. Excel and would love some advice.

I searched the boards pretty extensively but could not find what I am looking for...I apologize if this is a duplicate.

I am using Excel 2007

How do you automatically add rows and update values for cells to a linked worksheet in which rows have been added? For example: Sheet 1, columns A & B are linked to Sheet 2, columns A & B. Sheet 2 has values in A1:A5 & B1:B5 and Sheet 1, since it is linked, has the same info. I want to add a row in between 3 & 4 on Sheet 2 and want Sheet 1 to automatically add the same row and update the value of the cell in column A & B.

Any help is greatly appreciated!

John



Hi all,

I hope you can help me with what I would like to do. I've searched and searched and not come up with anything yet!!

I have one sheet which is my 'data' sheet with a number of columns, one of which is a date which may be repeated.

I then want to use another sheet with two cells where two dates can be entered and a button which allows you to copy the rows of data from the data sheet which have dates between the two specified originally. The list in the data sheet may not be in date order although I could update a macro to do this for me if needed. I would also like to do it so that if "ALL" is typed in the date fields, it pulls over ALL the data. (Or something similar)

Any help you can give would be much appreciated.

Cheers,

Kevin


Hi folks,

My problem is Tab no longer moves your active cell selection one to the right. It now moves to the last cell in your spreadsheet to the right (similar to CTRL+Arrow Key Right).

I seem to remember this being a simple setting you can change, but was unable to find it myself, or search the web for the way out. So my last result is asking the experts .

Do any of you know how to make it so Tab goes back to just moving one cell to the right again?

Thanks in advanced.


I have never really used VBA and so am completely stuck at this problem. I need to create a macro which auto-populates a master worksheet from the individual user sheets in a shared workbook.

Sheet 1 is the master sheet "Team Stats". There will be an undetermined number of individual worksheets to accomodate new staff.

Each worksheet will be identical, using columns A-I with row 1 having the headings:

Date, Name, Reference, Value, Price, Age, Purchased?, Destination, Add. Products (the last 3 columns will have a drop-down list which will be used to enter data into the cell).

There will be a varying number of rows in each of the individual sheets.

If possible I would like the macro to run every time data is entered into one of the individual worksheets. If this is not then it would be fien to update every time the workbook is opened.

If anyone can help it would really cut down the time I spend collating these stats every day!


Hey everyone,

I'm really hoping someone can help me with this...

I need to plot percentages over time in a line graph in excel. I don't want to have to do a percentage equation in the spreadsheet, I just want excel to take two sets of values and display the percentage in the chart. For example, I need B1 as a percentage of B2 for week 1, C1 as a percentage of C2 for week 2, etc....
Can someone please offer a suggestion for how to do this? I would really appreciate it.
Also, would it be possible to link data from other sheets in the workbook into one single chart?


How would I create a system where an excel file is updated in real time with new values? I have a program which logs data, and I want to have excel open, plotting the data in real time. Is this possible?