Vba Code For Pca |
Vba Code For Pca - Excel |
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Hi everyone,
I'm just a newbee to VBA/Excel. For a project, I have to write a function to calculate the eigenvectors and eigenvalues of a matrix using the "Power Method". I've tried searching the web for some help but there's not much out there. Essentially, I want to input a matrix from the excel spreadsheet along with a tolerance level (i.e. two inputs).
The function then calculates the covariance matrix, call this M (m x m), of the input data. You then make an initial guess of the eigenvector, let's say this is a vector of 1's (m x 1) (call this x), you multiply the two together to get
y=Mx
You then calculate beta which is the element of y with the largest modulus. And, recalculate x as
x=(1/beta)y
and then calculate new y, y=Mx
This is done iteratively until the difference between the old x and new x is less than the tolerance level.
The normalised x, i.e. (1/sqrt(sum(x^2)))*x , call this v, is the first prinicipal component and the last value of beta is the associated eigenvalue.
A new M is calculated as Mnew = M-beta*v*transpose(v)
And, the whole procedure is repeat for Mnew to get the second prinicipal component and associated eigenvalue. The is done m times.
I want to output all the eigenvectors (prinicipal components) and eigenvalues to some location in the spreadsheet.
I would be extremely grateful if someone could assist me with writing this function or providing some pointers.
Regards,
John
I'm just a newbee to VBA/Excel. For a project, I have to write a function to calculate the eigenvectors and eigenvalues of a matrix using the "Power Method". I've tried searching the web for some help but there's not much out there. Essentially, I want to input a matrix from the excel spreadsheet along with a tolerance level (i.e. two inputs).
The function then calculates the covariance matrix, call this M (m x m), of the input data. You then make an initial guess of the eigenvector, let's say this is a vector of 1's (m x 1) (call this x), you multiply the two together to get
y=Mx
You then calculate beta which is the element of y with the largest modulus. And, recalculate x as
x=(1/beta)y
and then calculate new y, y=Mx
This is done iteratively until the difference between the old x and new x is less than the tolerance level.
The normalised x, i.e. (1/sqrt(sum(x^2)))*x , call this v, is the first prinicipal component and the last value of beta is the associated eigenvalue.
A new M is calculated as Mnew = M-beta*v*transpose(v)
And, the whole procedure is repeat for Mnew to get the second prinicipal component and associated eigenvalue. The is done m times.
I want to output all the eigenvectors (prinicipal components) and eigenvalues to some location in the spreadsheet.
I would be extremely grateful if someone could assist me with writing this function or providing some pointers.
Regards,
John
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Knowldege is Power
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Good afternoon!
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Happy New Year!
~ Brenda ~
I'm working with Excel 2003 sp 3 on Windows xp.
I have been banging my head trying to jar loose the formula to calculate man days where 1 equals 8 hours. I have one that was given to me by a coworker:
=INT(Q3/8)+(((Q3/8)-(INT(Q3/8)))*0.8)
That calculates man days from total hours. I need a formula that will total man days and return the man day answer. Example:
weekending 12/25 = 16.2 which is 16 man days and 2 hours
weekending 1/1 = 24.7 which is 24 man days and 7 hours
Total = 41 man days and 1 hour
I have also been asked if there was a way for a number to be entered into a spreadsheet and automatically put in order without a macro or "pushing a button".
Any advice is greatly appreciated!
Happy New Year!
~ Brenda ~
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Hopefully a simpler question for your experience level than mine.
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Hopefully a simpler question for your experience level than mine.
Hi there
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Your assistance or anybody's on the forum will be greatly appreciated
Regards
Howard
http://www.mrexcel.com/forum/showthr...ghlight=howardneed
I can calculate the formula for this , but the problem comes where for eg there is a loss in Jan 2008 for -95415 and there was a profit in Jan 2007 for 80215. How do I set up formula to take negatives & positives into account in calculating the increase or decrease/
Your assistance or anybody's on the forum will be greatly appreciated
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Howard
http://www.mrexcel.com/forum/showthr...ghlight=howardneed
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I've found this thread that has one for numbers, but I can't figure out how to do it for text values...
http://www.excelforum.com/excel-prog...m-numbers.html
Thanks all!
I'd like to do this in Excel, but I can't figure out how to have a randomly generating non-repeating macro with text values in cells.
So right now I have a column of 8 values and need matrix of 7 columns by 8 rows next to it.
I've found this thread that has one for numbers, but I can't figure out how to do it for text values...
http://www.excelforum.com/excel-prog...m-numbers.html
Thanks all!
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Received Date & Time: 10/29/2010 3:27:00 PM
Completed Date & Time: 11/1/2010 3:57:32 AM
Business Hours: 08:00 AM to 05:00 PM
Non Business hours: 05:00 PM to 08:00 AM
Weekdays : Monday to Friday
Weekends: Saturday & Sunday
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Please let me know if you need any more details
Received Date & Time: 10/29/2010 3:27:00 PM
Completed Date & Time: 11/1/2010 3:57:32 AM
Business Hours: 08:00 AM to 05:00 PM
Non Business hours: 05:00 PM to 08:00 AM
Weekdays : Monday to Friday
Weekends: Saturday & Sunday
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In this scenario I have completed the task before 8:00 AM on 11/01 so it should show duration of 1hour 33 minutes.
Please let me know if you need any more details
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I know Excel "ok", but I don't know programming.'
I'd like to be able to do something very simple (for now)...
For example...if I had PRODUCT / CODE / INV VALUE
A - CODE A - 5
B - CODE B - 11
C - CODE C - 14
I would want to be able to click a button (or scan a code for) : ADD +1 or REMOVE -1
...then scan the barcode on the product (A) and have it add or remove one, respectively. So, if the row for A is:
A - CODE A - 5
I choose "ADD" (with a button or scan code), then scan the barcode, and the spreadsheet automatically finds the code in the sheet, and changes the corresponding inventory value:
A - CODE A - 6
Does that make sense? How might I go about doing that?
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I have a file that has 8 sheets. the first seven sheets are the days of the week and the 8th sheet is where I want to calculate the hours.
The days of the week consists of "Name" "Date" Hours"
The 8th sheet consists of "Name", "Days of the week in their own column (7 columns in total)", "Total Hours" and "Total Days Worked"
Now... each day is always a different group and what I'm hoping for is to create a formula that can grab each name with their hours and throw them into the 8th sheet. So when the end of the week is done I have all the Employees weekly hours and days worked all finished.
I hope this makes sense. This file is to track about 100 employees that are on a rotational work schedule.
I have attached a sample file.
Thanks in advance for your help.
I have a file that has 8 sheets. the first seven sheets are the days of the week and the 8th sheet is where I want to calculate the hours.
The days of the week consists of "Name" "Date" Hours"
The 8th sheet consists of "Name", "Days of the week in their own column (7 columns in total)", "Total Hours" and "Total Days Worked"
Now... each day is always a different group and what I'm hoping for is to create a formula that can grab each name with their hours and throw them into the 8th sheet. So when the end of the week is done I have all the Employees weekly hours and days worked all finished.
I hope this makes sense. This file is to track about 100 employees that are on a rotational work schedule.
I have attached a sample file.
Thanks in advance for your help.
I need information on how to enter the proper syntax (formula) so that excel
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overtime. The 8 would be considered regular hours and anything over is OT.
can calculate overtime hours. In california over 8 hrs in one day is
overtime. The 8 would be considered regular hours and anything over is OT.