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st: -forvalues- fails to reach upper limit of range


From   Richard Sherman <richard.sherman@mac.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: -forvalues- fails to reach upper limit of range
Date   Wed, 3 May 2006 19:53:12 +0200

Dear statalist,

Using Stata 8.2, I am having trouble repeating a process the correct number of times using -forvalues-. The range is specified as (e.g.)

forval i = 1(.1)2

Here, 2 is the upper limit of the range. But the final operation involving `i' ends at 1.9 rather than 2.

A simple example follows. The second -forval- encloses a command to put the value of the counter `i' in a variable repeatedly. The first -forval- causes this to repeat for different upper limits of the inner -forval- loop. The output is a summary of the resulting variables. Note the maximum values. I expect the maximum value to be 1, then 2, then 3, etc. Thanks for any help.

- Richard


. forval u = 1/10 {
2. clear
3. set obs 100
4. gen x = .
5. forval i = 1(.1)`u' {
6. local n = float(10*(`i'))
7. qui replace x = `i' in `n'
8. }
9. su
10. }
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 1 1 . 1 1
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 10 1.45 .302765 1 1.9
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 20 1.95 .591608 1 2.9
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 30 2.45 .8803408 1 3.9
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 41 3 1.197915 1 5
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 51 3.5 1.486607 1 6
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 61 4 1.775293 1 7
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 71 4.5 2.063977 1 8
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 81 5 2.352658 1 9
obs was 0, now 100
(100 missing values generated)

Variable | Obs Mean Std. Dev. Min Max
-------------+--------------------------------------------------------
x | 91 5.5 2.641338 1 10

.
end of do-file



-------------------------------------------------
Richard Sherman
Department of Political Science, Leiden University
Leiden, Netherlands
http://homepage.mac.com/richard.sherman


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