/* nag_blgm_lm_formula (g22yac) Example Program.
*
* Copyright 2024 Numerical Algorithms Group.
*
* Mark 30.1, 2024.
*/
/* Pre-processor includes */
#include <nag.h>
#include <stdio.h>
#include <string.h>
#define MAX_FORMULA_LEN 200
#define MAX_VNAME_LEN 200
#define MAX_CVALUE_LEN 200
#define DAT(I, J) dat[(J)*lddat + (I)]
#define X(I, J) x[(J)*ldx + (I)]
char *read_line(char formula[], Integer nchar);
int main(void) {
/* Integer scalar and array declarations */
Integer i, j, ivalue, lddat, ldx, lvnames = 0, mx, nobs, nvar, sddat, sdx,
lcvalue;
Integer exit_status = 0;
Integer *levels = 0;
/* Nag Types */
NagError fail;
Nag_VariableType optype;
/* Double scalar and array declarations */
double rvalue;
double *dat = 0, *x = 0, *y = 0;
/* Character scalar and array declarations */
char cvalue[MAX_CVALUE_LEN], formula[MAX_FORMULA_LEN];
char **vnames = 0;
/* Void pointers */
void *hform = 0, *hddesc = 0, *hxdesc = 0;
/* Initialize the error structure */
INIT_FAIL(fail);
printf("nag_blgm_lm_formula (g22yac) Example Program Results\n\n");
/* Skip heading in data file */
scanf("%*[^\n] ");
/* Read in the formula for the full model, remove comments and */
/* call nag_blgm_lm_formula (g22yac) to parse it */
read_line(formula, MAX_FORMULA_LEN);
nag_blgm_lm_formula(&hform, formula, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_blgm_lm_formula (g22yac).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
/* Call nag_blgm_optget (g22znc) to extract the parsed formula */
lcvalue = MAX_CVALUE_LEN;
nag_blgm_optget(hform, "Formula", &ivalue, &rvalue, cvalue, lcvalue, &optype,
&fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_blgm_optget (g22znc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
printf(" Formula: %s\n", cvalue);
printf("\n");
/* Read in size of the data matrix and number of variable labels supplied */
scanf("%" NAG_IFMT "%" NAG_IFMT "%" NAG_IFMT "%*[^\n] ", &nobs, &nvar,
&lvnames);
/* Allocate memory */
if (!(levels = NAG_ALLOC(nvar, Integer)) ||
!(vnames = NAG_ALLOC(lvnames, char *))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
for (i = 0; i < lvnames; i++)
if (!(vnames[i] = NAG_ALLOC(MAX_VNAME_LEN, char))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
/* Read in number of levels and names for the variables */
for (i = 0; i < nvar; i++) {
scanf("%" NAG_IFMT "", &levels[i]);
}
scanf("%*[^\n] ");
if (lvnames > 0) {
for (i = 0; i < lvnames; i++)
scanf("%50s", vnames[i]);
scanf("%*[^\n] ");
}
/* Call nag_blgm_lm_describe_data (g22ybc) to get a description of */
/* the data matrix */
nag_blgm_lm_describe_data(&hddesc, nobs, nvar, levels, lvnames, vnames,
&fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_blgm_lm_describe_data (g22ybc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}
/* Read in the data matrix and response variable */
lddat = nobs;
sddat = nvar;
if (!(dat = NAG_ALLOC(lddat * sddat, double)) ||
!(y = NAG_ALLOC(nobs, double))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
for (i = 0; i < nobs; i++) {
for (j = 0; j < nvar; j++)
scanf("%lf", &DAT(i, j));
scanf("%lf", &y[i]);
}
scanf("%*[^\n] ");
/* Call nag_blgm_optset (g22zmc) to set optional arguments */
/* Want the design matrix to include an explicit term for the mean effect */
nag_blgm_optset(hform, "Explicit Mean = Yes", &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_blgm_optset (g22zmc).\n%s\n", fail.message);
exit_status = 1;
goto END;
}
/* Call nag_blgm_lm_design_matrix (g22ycc) to get the size of */
/* the design matrix */
ldx = 0;
sdx = 0;
nag_blgm_lm_design_matrix(hform, hddesc, dat, lddat, sddat, &hxdesc, x, ldx,
sdx, &mx, &fail);
if (fail.code != NW_ARRAY_SIZE && fail.code != NW_ALTERNATIVE) {
printf("Error from nag_blgm_lm_design_matrix (g22ycc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}
/* Allocate design matrix */
ldx = nobs;
sdx = mx;
if (!(x = NAG_ALLOC(ldx * sdx, double))) {
printf("Allocation failure\n");
exit_status = -1;
goto END;
}
/* Call nag_blgm_lm_design_matrix (g22ycc) to generate the design matrix */
nag_blgm_lm_design_matrix(hform, hddesc, dat, lddat, sddat, &hxdesc, x, ldx,
sdx, &mx, &fail);
if (fail.code != NE_NOERROR) {
printf("Error from nag_blgm_lm_design_matrix (g22ycc).\n%s\n",
fail.message);
exit_status = 1;
goto END;
}
/* Display the design matrix */
printf(" Design Matrix (X)\n");
for (i = 0; i < nobs; i++) {
for (j = 0; j < mx; j++)
printf(" %4.1f", X(i, j));
printf("\n");
}
END:
/* Call nag_blgm_handle_free (g22zac) to clean-up the g22 handles */
nag_blgm_handle_free(&hform, &fail);
nag_blgm_handle_free(&hddesc, &fail);
nag_blgm_handle_free(&hxdesc, &fail);
NAG_FREE(dat);
NAG_FREE(x);
NAG_FREE(y);
NAG_FREE(levels);
for (i = 0; i < lvnames; i++)
NAG_FREE(vnames[i]);
NAG_FREE(vnames);
return (exit_status);
}
char *read_line(char formula[], Integer nchar) {
/* Read in a line from stdin and remove any comments */
char *pch;
/* Read in the model formula */
if (fgets(formula, nchar, stdin)) {
/* Strip comments from formula */
pch = strstr(formula, "::");
if (pch)
*pch = '\0';
return formula;
} else {
return 0;
}
}