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st: St: Dataset generation


From   J.A.Fennema@hw.ac.uk
To   statalist@hsphsun2.harvard.edu
Subject   st: St: Dataset generation
Date   Fri, 14 Jun 2002 16:32:20 +0100 (BST)

Please could somebody explain to me how this could occur:

I want to generate a dataset with 6561 observations, with two 
variables, let us say x and y, which take values between -2 and 2, 
with step value 0.05. The aim of this is to test a function which I 
have programmed which is causing some trouble. Therefore I need 81 
occurences of x==-2, and 81 of x==-1.95 and so on for both x and y. 
If I construct x as follows (crude so feel free to suggest 
alternatives)

egen ind=fill (1 2)
replace ind=ind-1
gen x=int(ind/81)
replace x=(x/20)-2

this should work, and does when the data is displayed to 2 decimal 
places. However closer examination of the data with the data browser 
shows some anomalies, where rather that x==-.95 it actually reads 
x==.-9499999. This occurs for many values in between -1 and 1 and 
attempts to rectify it using

gen x2=round(x,0.05)

have not bourne fruit. What am I missing?

Many thanks in advance,
Julian
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