! G22YCF Example Program Text
! Mark 30.1 Release. NAG Copyright 2024.
Module g22ycfe_mod
! G22YCF Example Program Module:
! Parameters and User-defined Routines
! .. Use Statements ..
Use nag_library, Only: nag_wp
! .. Implicit None Statement ..
Implicit None
! .. Accessibility Statements ..
Private
Public :: print_x, read_line
! .. Parameters ..
Integer, Parameter, Public :: nin = 5, nout = 6
Contains
Subroutine read_line(ierr,v1,v2)
! Read in a line from NIN, remove any comments and optionally
! split out the first word
! .. Scalar Arguments ..
Integer, Intent (Out) :: ierr
Character (*), Intent (Out) :: v1
Character (*), Intent (Out), Optional :: v2
! .. Local Scalars ..
Integer :: pend
! .. Intrinsic Procedures ..
Intrinsic :: adjustl, index, present
! .. Executable Statements ..
Read (nin,'(A200)',Iostat=ierr) v1
If (ierr==0) Then
pend = index(v1,'::')
If (pend/=0) Then
v1 = v1(1:pend-1)
End If
v1 = adjustl(v1)
If (present(v2)) Then
! split the first word from the line
pend = index(v1,' ')
If (pend/=0) Then
v2 = adjustl(v1(pend:))
v1 = adjustl(v1(1:pend))
Else
v2 = ''
End If
End If
End If
Return
End Subroutine read_line
Subroutine print_x(intcpt,plab,nobs,mx,x,text)
! Print the transpose of the first 10 rows of the design matrix
! .. Parameters ..
Integer, Parameter :: max_rows = 10
! .. Scalar Arguments ..
Integer, Intent (In) :: mx, nobs
Character (*), Intent (In) :: intcpt, text
! .. Array Arguments ..
Real (Kind=nag_wp), Intent (In) :: x(:,:)
Character (*), Intent (In) :: plab(:)
! .. Local Scalars ..
Integer :: i, pnobs, si
! .. Intrinsic Procedures ..
Intrinsic :: min, repeat, trim
! .. Executable Statements ..
! PLAB holds the labels for the model parameters, so includes a label
! for the mean effect, if one is present. As the mean effect is not
! being explicitly included in the design matrix, we may need to skip
! the first element of PLAB (which will always be the label for the
! mean effect if one is present)
If (intcpt=='M') Then
si = 1
Else
si = 0
End If
! Printing the first MAX_ROWS rows of the design matrix
pnobs = min(max_rows,nobs)
! Display the design matrix
Write (nout,99998) 'Transpose of First ', pnobs, ' Rows of the ', &
text, ' Design Matrix (X)'
Write (nout,99997) 'Column Name', (i,i=1,pnobs)
Write (nout,99996) repeat('-',15+pnobs*5)
Do i = 1, mx
Write (nout,99999) plab(i+si), x(1:pnobs,i)
End Do
Write (nout,*) 'Intercept flag = ', trim(intcpt)
Return
99999 Format (1X,A15,100(1X,F4.1))
99998 Format (1X,A,I0,A,A,A)
99997 Format (1X,A,3X,100(3X,I2))
99996 Format (1X,A)
End Subroutine print_x
End Module g22ycfe_mod
Program g22ycfe
! .. Use Statements ..
Use g22ycfe_mod, Only: nin, nout, print_x, read_line
Use, Intrinsic :: iso_c_binding, Only: c_null_ptr, &
c_ptr
Use nag_library, Only: g22yaf, g22ybf, g22ycf, g22ydf, g22zaf, g22zmf, &
nag_wp
! .. Implicit None Statement ..
Implicit None
! .. Local Scalars ..
Type (c_ptr) :: hddesc, hform, hxdesc
Integer :: i, ierr, ifail, ip, lddat, ldx, &
lisx, lplab, lvinfo, lvnames, mx, &
nobs, nvar, sddat, sdx
Character (200) :: formula, intcpt, line, tcontrast, &
tvname
! .. Local Arrays ..
Real (Kind=nag_wp), Allocatable :: dat(:,:), x(:,:)
Real (Kind=nag_wp) :: tx(0,0)
Integer, Allocatable :: isx(:), levels(:), vinfo(:)
Character (50), Allocatable :: plab(:), vnames(:)
! .. Intrinsic Procedures ..
Intrinsic :: trim
! .. Executable Statements ..
Write (nout,*) 'G22YCF Example Program Results'
Write (nout,*)
hform = c_null_ptr
hddesc = c_null_ptr
hxdesc = c_null_ptr
! Skip heading in data file
Read (nin,*)
! Read in the formula for the first specification of the model,
! remove comments and parse it
Call read_line(ierr,formula)
ifail = 0
Call g22yaf(hform,formula,ifail)
! Read in the contrast to use for all parameters, remove comments and
! set the contrast optional parameter
Call read_line(ierr,tcontrast)
line = 'Contrast=' // trim(tcontrast)
ifail = 0
Call g22zmf(hform,line,ifail)
! Read in size of the data matrix and number of variable labels supplied
Read (nin,*) nobs, nvar, lvnames
! Read in number of levels and names for the variables
Allocate (levels(nvar),vnames(lvnames))
Read (nin,*) levels(1:nvar)
If (lvnames>0) Then
Read (nin,*) vnames(1:lvnames)
End If
! Create a description of the data matrix
ifail = 0
Call g22ybf(hddesc,nobs,nvar,levels,lvnames,vnames,ifail)
! Read in the data matrix
lddat = nobs
sddat = nvar
Allocate (dat(lddat,sddat))
Read (nin,*)(dat(i,1:nvar),i=1,nobs)
! Calculate the size of the design matrix
ldx = 0
sdx = 0
ifail = 1
Call g22ycf(hform,hddesc,dat,lddat,sddat,hxdesc,tx,ldx,sdx,mx,ifail)
If (ifail/=81 .And. ifail/=82 .And. ifail/=91 .And. ifail/=92) Then
! Redisplay any error messages not related to X being too small
ifail = 0
Call g22ycf(hform,hddesc,dat,lddat,sddat,hxdesc,tx,ldx,sdx,mx,ifail)
End If
! Generate the design matrix, X
ldx = nobs
sdx = mx
Allocate (x(ldx,sdx))
ifail = 0
Call g22ycf(hform,hddesc,dat,lddat,sddat,hxdesc,x,ldx,sdx,mx,ifail)
! Generate labels for the columns of X
lplab = mx + 1
lvinfo = 0
lisx = 0
Allocate (isx(lisx),vinfo(lvinfo),plab(lplab))
ifail = 0
Call g22ydf('X',hform,hxdesc,intcpt,ip,lisx,isx,lplab,plab,lvinfo,vinfo, &
ifail)
! Display the design matrix
Call print_x(intcpt,plab,nobs,mx,x,'First')
c_lp: Do
! Read in the name of the variable whose contrasts need to be changed,
! the value to change them to, remove comments and set the contrast
! optional argument for the specified variable
Call read_line(ierr,tvname,tcontrast)
If (ierr/=0) Then
Exit c_lp
End If
line = 'Contrast:' // trim(tvname) // '=' // trim(tcontrast)
ifail = 0
Call g22zmf(hform,line,ifail)
End Do c_lp
! Regenerate the design matrix using the new contrasts
! (the size of X should be the same as previously)
ifail = 0
Call g22ycf(hform,hddesc,dat,lddat,sddat,hxdesc,x,ldx,sdx,mx,ifail)
! Generate labels for the columns of X
ifail = 0
Call g22ydf('X',hform,hxdesc,intcpt,ip,lisx,isx,lplab,plab,lvinfo,vinfo, &
ifail)
! Display the design matrix
Write (nout,*)
Call print_x(intcpt,plab,nobs,mx,x,'Second')
! Clean-up the G22 handles
ifail = 0
Call g22zaf(hform,ifail)
Call g22zaf(hddesc,ifail)
Call g22zaf(hxdesc,ifail)
Deallocate (dat,x)
Deallocate (isx,levels,vinfo)
Deallocate (plab,vnames)
End Program g22ycfe