Hi,
I'd like to use following formula on like this:
| t | y_t | y_{t+1} |
|---+-----+---------|
| 1 | 115 | |
| 2 | 121 | |
| 3 | 118 | |
| 4 | 127 | |
$4 = \sum_{\tau=0}^{@#-2}{0.9^{\tau} * y_{@#-2-\tau}}
So that's a simple sum, which just iterates over the values and uses the
index for power and to get the value of y_{4-\tau}. So @5$3 should be
0.9^0*127 + 0.9^1*118 + 0.9^2*121 + 0.9^3*115. Shouldn't be too hard I
though, but I couldn't figure it out how to implement it using
org-spreadsheets.
As I need the index I tried using subscr with no success. I can
obviously generate the list of rows used for the calculation using
@2$1..@2$#. However, as soon as I use an elsip function in the formula I
struggle with the representation of the list:
#+TBLFM: $3='(mapcar '1+ (@2$1..@2$#))
shows following debug output:
Substitution history of formula
Orig: '(mapcar '1+ (@2$1..@2$3))
$xyz-> '(mapcar '1+ (@2$1..@2$3))
@r$c-> '(mapcar '1+ (#("1" 0 1 (fontified t line-prefix #("******* " 0 7
(face org-indent)) wrap-prefix #("******* " 0 8 (face org-indent)) face
org-table)) #("115" 0 3 (fontified t line-prefix #("******* " 0 7 (face
org-indent)) wrap-prefix #("******* " 0 8 (face org-indent)) face org-table))))
$1-> '(mapcar '1+ (#("1" 0 1 (fontified t line-prefix #("******* " 0 7
(face org-indent)) wrap-prefix #("******* " 0 8 (face org-indent)) face
org-table)) #("115" 0 3 (fontified t line-prefix #("******* " 0 7 (face
org-indent)) wrap-prefix #("******* " 0 8 (face org-indent)) face org-table))))
Result: #ERROR
Format: NONE
Final: #ERROR
Is there a simple way to do it? Do I need to go over elsip functions,
and if so. How can I properly use a list?
I couldn't find a way on the web.
Best regards
Manuel
