You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
39 lines
1009 B
Plaintext
39 lines
1009 B
Plaintext
7 months ago
|
*! Version 2.0, October 2002. (SJ4-1: st0057)
|
||
|
|
|
||
|
|
program define ghquad
|
||
|
|
version 7.0
|
||
|
|
syntax [varlist(min=2 max=2)] [, N(integer 10)]
|
||
|
|
tokenize `varlist'
|
||
|
|
local x "`1'"
|
||
|
|
local w "`2'"
|
||
|
|
if `n' + 2 > _N {
|
||
|
|
di in red /*
|
||
|
|
*/ "`n' + 2 observations needed to compute quadrature points"
|
||
|
|
exit 2001
|
||
|
|
}
|
||
|
|
tempname xx ww
|
||
|
|
|
||
|
|
local i 1
|
||
|
|
local m = int((`n' + 1)/2)
|
||
|
|
while `i' <= `m' {
|
||
|
|
if `i' == 1 {
|
||
|
|
scalar `xx' = sqrt(2*`n'+1)-1.85575*(2*`n'+1)^(-1/6)
|
||
|
|
}
|
||
|
|
else if `i' == 2 { scalar `xx' = `xx'-1.14*`n'^0.426/`xx' }
|
||
|
|
else if `i' == 3 { scalar `xx' = 1.86*`xx'-0.86*`x'[1] }
|
||
|
|
else if `i' == 4 { scalar `xx' = 1.91*`xx'-0.91*`x'[2] }
|
||
|
|
else { scalar `xx' = 2*`xx'-`x'[`i'-2] }
|
||
|
|
hermite `n' `xx' `ww'
|
||
|
|
qui replace `x' = `xx' in `i'
|
||
|
|
qui replace `w' = `ww' in `i'
|
||
|
|
local i = `i' + 1
|
||
|
|
}
|
||
|
|
if mod(`n', 2) == 1 { qui replace `x' = 0 in `m' }
|
||
|
|
qui replace `x' = -`x'[`n'+1-_n] in `i'/`n'
|
||
|
|
qui replace `w' = `w'[`n'+1-_n] in `i'/`n'
|
||
|
|
end
|
||
|
|
exit
|
||
|
|
|
||
|
|
|
||
|
|
|