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#1
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Calculate NPV - Array must be flexible
I have a database with different dataset. That is the input to a
worksheet that calculate NPV. The array that I want to calculate NPV could look like this: 0 0 -200 50 50 50 -10 40 30 -20 -20 -20 The array for this dataset must be from -200 to 30. How could the arrayargument in the NPV-function look like? I am thinking of using OFFSET or some kind of Arrayfunction. |
#2
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Calculate NPV - Array must be flexible
What is NPV and how is it calculated?
RBS "Helge's" wrote in message ... I have a database with different dataset. That is the input to a worksheet that calculate NPV. The array that I want to calculate NPV could look like this: 0 0 -200 50 50 50 -10 40 30 -20 -20 -20 The array for this dataset must be from -200 to 30. How could the arrayargument in the NPV-function look like? I am thinking of using OFFSET or some kind of Arrayfunction. |
#3
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Calculate NPV - Array must be flexible
On 18 Jan, 22:53, "RB Smissaert"
wrote: What is NPV and how is it calculated? RBS "Helge's" wrote in message ... I have a database with different dataset. That is the input to a worksheet that calculate NPV. The array that I want to calculate NPV could look like this: 0 0 -200 50 50 50 -10 40 30 -20 -20 -20 The array for this dataset must be from -200 to 30. How could the arrayargument in the NPV-function look like? I am thinking of using OFFSET or some kind of Arrayfunction. Skjul sitert tekst Vis sitert tekst NPV calculates the net present value of an investment with the discount rate and several future payments and income: =NPV(rate,array) |
#4
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Calculate NPV - Array must be flexible
What determines that you want to start with the -200 value cell and end with
the 30 value cell? If, for example, you have other variables which say start at the 3rd cell and end at the 10th cell, just use those to formulate the range to feed to NPV. Regards, Fred. "Helge's" wrote in message ... I have a database with different dataset. That is the input to a worksheet that calculate NPV. The array that I want to calculate NPV could look like this: 0 0 -200 50 50 50 -10 40 30 -20 -20 -20 The array for this dataset must be from -200 to 30. How could the arrayargument in the NPV-function look like? I am thinking of using OFFSET or some kind of Arrayfunction. |
#5
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Calculate NPV - Array must be flexible
On 19 Jan, 06:13, "Fred Smith" wrote:
What determines that you want to start with the -200 value cell and end with the 30 value cell? If, for example, you have other variables which say start at the 3rd cell and end at the 10th cell, just use those to formulate the range to feed to NPV. Regards, Fred. "Helge's" wrote in message ... I have a database with different dataset. That is the input to a worksheet that calculate NPV. The array that I want to calculate NPV could look like this: 0 0 -200 50 50 50 -10 40 30 -20 -20 -20 The array for this dataset must be from -200 to 30. How could the arrayargument in the NPV-function look like? I am thinking of using OFFSET or some kind of Arrayfunction. Skjul sitert tekst Vis sitert tekst It shall start the first place with a number (different from 0). Next dataset might have a number in the 5th cell. The last cell (in this case is 30) is the last cell with a postiv number. In this case it continue with only negative values (-20). |
#6
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Calculate NPV - Array must be flexible
On Mon, 19 Jan 2009 01:02:02 -0800 (PST), "Helge's"
wrote: It shall start the first place with a number (different from 0). Next dataset might have a number in the 5th cell. The last cell (in this case is 30) is the last cell with a postiv number. In this case it continue with only negative values (-20). The following, entered as an **array** formula (confirmed by holding down <ctrl-shift while hitting <enter ) will generate NPV based on the values from the first non-zero number to the last positive value. Rate is either a % or a cell reference containing the interest rate you want to use. =NPV(Rate,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- MATCH(TRUE,rng<0,0)+1,1)) --ron |
#7
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Calculate NPV - Array must be flexible
On 19 Jan, 13:12, Ron Rosenfeld wrote:
On Mon, 19 Jan 2009 01:02:02 -0800 (PST), "Helge's" wrote: It shall start the first place with a number (different from 0). Next dataset might have a number in the 5th cell. The last cell (in this case is 30) is the last cell with a postiv number. In this case it continue with only negative values (-20). The following, entered as an **array** formula (confirmed by holding down <ctrl-shift while hitting <enter ) will generate NPV based on the values from the first non-zero number to the last positive value. Rate is either a % or a cell reference containing the interest rate you want to use. =NPV(Rate,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- MATCH(TRUE,rng<0,0)+1,1)) --ron The formula looks very good, but it seems to not cut on the last positive value. I do not understand the rng=LOOKUP. What are you looking up. Why are you using 1/(rng0)? |
#8
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Calculate NPV - Array must be flexible
On Mon, 19 Jan 2009 11:58:49 -0800 (PST), "Helge's"
wrote: On 19 Jan, 13:12, Ron Rosenfeld wrote: On Mon, 19 Jan 2009 01:02:02 -0800 (PST), "Helge's" wrote: It shall start the first place with a number (different from 0). Next dataset might have a number in the 5th cell. The last cell (in this case is 30) is the last cell with a postiv number. In this case it continue with only negative values (-20). The following, entered as an **array** formula (confirmed by holding down <ctrl-shift while hitting <enter ) will generate NPV based on the values from the first non-zero number to the last positive value. Rate is either a % or a cell reference containing the interest rate you want to use. =NPV(Rate,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- MATCH(TRUE,rng<0,0)+1,1)) --ron The formula looks very good, but it seems to not cut on the last positive value. I do not understand the rng=LOOKUP. What are you looking up. Why are you using 1/(rng0)? It worked properly here on the data set you provided. How did you define rng? Did you enter this as an array formula (i.e. did Excel place braces {...} around the formula after you entered it)? LOOKUP(2,1/(rng0),rng) returns the last value in rng that contains a value greater than 0. rng=LOOKUP(2,1/(rng0),rng) returns an array of TRUE and FALSE depending on whether or not a value in rng matches the last positive number. You have to do this because there is no guarantee that the last positive value will be unique. (rng=LOOKUP(2,1/(rng0),rng))*ROW(rng) an array of either 0's, or the row numbers that contain that last positive value. MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng)) returns the highest numbered row value that contains the last positive number. --ron |
#9
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Calculate NPV - Array must be flexible
On Mon, 19 Jan 2009 11:58:49 -0800 (PST), "Helge's"
wrote: On 19 Jan, 13:12, Ron Rosenfeld wrote: On Mon, 19 Jan 2009 01:02:02 -0800 (PST), "Helge's" wrote: It shall start the first place with a number (different from 0). Next dataset might have a number in the 5th cell. The last cell (in this case is 30) is the last cell with a postiv number. In this case it continue with only negative values (-20). The following, entered as an **array** formula (confirmed by holding down <ctrl-shift while hitting <enter ) will generate NPV based on the values from the first non-zero number to the last positive value. Rate is either a % or a cell reference containing the interest rate you want to use. =NPV(Rate,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- MATCH(TRUE,rng<0,0)+1,1)) --ron The formula looks very good, but it seems to not cut on the last positive value. I do not understand the rng=LOOKUP. What are you looking up. Why are you using 1/(rng0)? OK, I see a problem with the formula when rng does not start in Row 1. The following modification should take care of that -- also an array formula: =NPV(5%,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- ROW(rng)-MATCH(TRUE,rng<0,0)+2,1)) --ron |
#10
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Calculate NPV - Array must be flexible
On 20 Jan, 03:34, Ron Rosenfeld wrote:
On Mon, 19 Jan 2009 11:58:49 -0800 (PST), "Helge's" wrote: On 19 Jan, 13:12, Ron Rosenfeld wrote: On Mon, 19 Jan 2009 01:02:02 -0800 (PST), "Helge's" wrote: It shall start the first place with a number (different from 0). Next dataset might have a number in the 5th cell. The last cell (in this case is 30) is the last cell with a postiv number. In this case it continue with only negative values (-20). The following, entered as an **array** formula (confirmed by holding down <ctrl-shift while hitting <enter ) will generate NPV based on the values from the first non-zero number to the last positive value. Rate is either a % or a cell reference containing the interest rate you want to use. =NPV(Rate,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- MATCH(TRUE,rng<0,0)+1,1)) --ron The formula looks very good, but it seems to not cut on the last positive value. I do not understand the rng=LOOKUP. What are you looking up. Why are you using 1/(rng0)? OK, I see a problem with the formula when rng does not start in Row 1. *The following modification should take care of that -- also an array formula: =NPV(5%,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- ROW(rng)-MATCH(TRUE,rng<0,0)+2,1)) --ron Skjul sitert tekst Vis sitert tekst Thank you very much. I modified the formula to this: =NPV($M$9;OFFSET (rng;MATCH(TRUE;rng<0;0)-1;0;MAX((rng=LOOKUP(2;1/(rng0);rng))*(ROW (rng)))-(MIN(ROW(rng)+1)))). It work. You know I have to translate the formula to norwegian. We are also using semicolon instead of comma to separate the arguments. Is amazing what an arrayformula can do. Thanks again. |
#11
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Calculate NPV - Array must be flexible
On Tue, 20 Jan 2009 01:38:56 -0800 (PST), "Helge's"
wrote: On 20 Jan, 03:34, Ron Rosenfeld wrote: On Mon, 19 Jan 2009 11:58:49 -0800 (PST), "Helge's" wrote: On 19 Jan, 13:12, Ron Rosenfeld wrote: On Mon, 19 Jan 2009 01:02:02 -0800 (PST), "Helge's" wrote: It shall start the first place with a number (different from 0). Next dataset might have a number in the 5th cell. The last cell (in this case is 30) is the last cell with a postiv number. In this case it continue with only negative values (-20). The following, entered as an **array** formula (confirmed by holding down <ctrl-shift while hitting <enter ) will generate NPV based on the values from the first non-zero number to the last positive value. Rate is either a % or a cell reference containing the interest rate you want to use. =NPV(Rate,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- MATCH(TRUE,rng<0,0)+1,1)) --ron The formula looks very good, but it seems to not cut on the last positive value. I do not understand the rng=LOOKUP. What are you looking up. Why are you using 1/(rng0)? OK, I see a problem with the formula when rng does not start in Row 1. *The following modification should take care of that -- also an array formula: =NPV(5%,OFFSET(rng,MATCH(TRUE,rng<0,0)-1,0, MAX((rng=LOOKUP(2,1/(rng0),rng))*ROW(rng))- ROW(rng)-MATCH(TRUE,rng<0,0)+2,1)) --ron Skjul sitert tekst Vis sitert tekst Thank you very much. I modified the formula to this: =NPV($M$9;OFFSET (rng;MATCH(TRUE;rng<0;0)-1;0;MAX((rng=LOOKUP(2;1/(rng0);rng))*(ROW (rng)))-(MIN(ROW(rng)+1)))). It work. You know I have to translate the formula to norwegian. We are also using semicolon instead of comma to separate the arguments. Is amazing what an arrayformula can do. Thanks again. Glad you got it working for you. --ron |
#12
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Calculate NPV - Array must be flexible
On Tue, 20 Jan 2009 01:38:56 -0800 (PST), "Helge's"
wrote: Thank you very much. I modified the formula to this: =NPV($M$9;OFFSET (rng;MATCH(TRUE;rng<0;0)-1;0;MAX((rng=LOOKUP(2;1/(rng0);rng))*(ROW (rng)))-(MIN(ROW(rng)+1)))). It work. You know I have to translate the formula to norwegian. We are also using semicolon instead of comma to separate the arguments. Is amazing what an arrayformula can do. Thanks again. There is a problem with the change you made with regard to how you calculate the height parameter. When you calculate the height parameter for the OFFSET function, your modification allows the resultant array to extend beyond the original definition of rng. You can show this by the following: Rang refers to $B$1:$B$12 Enter the following: $B$1: 0 $B$2: 0 $B$3: 0 $B$4: 0 $B$5: 50 $B$6: 50 $B$7: -10 $B$8: 40 $B$9: 30 $B$10: -20 $B$11: -20 $B$12: 20 Given the above, I would expect that you would want to only consider values in the range B5:B12 However, if, using your modification, you were to insert a value into either B13 or B14, you will find it included in the calculation. If you can guarantee that there will never be any entries below rung, your formula will work; however, it is not particularly robust when you need to rely on this sort of assumption. --ron |
#13
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Calculate NPV - Array must be flexible
On Tue, 20 Jan 2009 16:22:18 -0500, Ron Rosenfeld
wrote: Rang refers to $B$1:$B$12 Darn spell checkers; that should read: Rng refers to $B$1:$B$12 --ron |
#14
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Calculate NPV - Array must be flexible
On 20 Jan, 22:28, Ron Rosenfeld wrote:
On Tue, 20 Jan 2009 16:22:18 -0500, Ron Rosenfeld wrote: Rang refers to $B$1:$B$12 Darn spell checkers; that should read: Rng refers to $B$1:$B$12 --ron Thank you for reminding me about this. I will certenly check the formula and the model many times. I am reading me up about arrayformulas now. It is a hidden resource in Excel. A bit difficult to understand. |
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