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#ifndef lint |
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static const char RCSid[] = "$Id: gcalc.c,v 1.2 2003/06/30 14:59:12 schorsch Exp $"; |
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#endif |
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/* |
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* gcalc.c - routines to do calculations on graph files. |
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* |
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* 7/7/86 |
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* Greg Ward Larson |
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*/ |
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|
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#include <stdio.h> |
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#include <string.h> |
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|
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#include "mgvars.h" |
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|
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|
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static double xsum, xxsum, ysum, yysum, xysum; |
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static double xmin, xmax, ymin, ymax; |
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static double lastx, lasty, rsum; |
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static int npts; |
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|
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static void gcheader(char *types); |
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static void calcpoint(int c, double x, double y); |
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static void gcvalue(int c, char *types); |
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|
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void |
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gcalc( /* do a calculation */ |
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char *types |
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) |
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{ |
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int i; |
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|
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if (strchr(types, 'h') == NULL) |
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gcheader(types); |
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|
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xmin = gparam[XMIN].flags & DEFINED ? |
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varvalue(gparam[XMIN].name) : |
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-1e10; |
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xmax = gparam[XMAX].flags & DEFINED ? |
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varvalue(gparam[XMAX].name) : |
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1e10; |
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|
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for (i = 0; i < MAXCUR; i++) { |
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xsum = xxsum = ysum = yysum = xysum = 0.0; |
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rsum = 0.0; |
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npts = 0; |
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mgcurve(i, calcpoint); |
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gcvalue(i, types); |
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} |
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} |
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|
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|
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void |
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gcheader( /* print header */ |
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register char *types |
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) |
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{ |
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printf("__"); |
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while (*types) |
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switch (*types++) { |
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case 'n': |
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printf("|_Label___________"); |
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break; |
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case 'a': |
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printf("|____Mean______S.D._"); |
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break; |
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case 'm': |
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printf("|_____Min_______Max_"); |
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break; |
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case 'i': |
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printf("|___Integ_"); |
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break; |
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case 'l': |
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printf("|___Slope_____Intcp______Corr_"); |
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break; |
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default: |
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break; |
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} |
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printf("\n"); |
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} |
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|
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|
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void |
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gcvalue( /* print the values for the curve */ |
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int c, |
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register char *types |
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) |
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{ |
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double d1, d2, d3, sqrt(); |
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|
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if (npts < 1) |
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return; |
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|
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printf("%c:", c+'A'); |
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while (*types) |
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switch (*types++) { |
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case 'n': |
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printf(" %-16s", cparam[c][CLABEL].flags & DEFINED ? |
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cparam[c][CLABEL].v.s : ""); |
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break; |
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case 'a': |
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d1 = sqrt((yysum - ysum*ysum/npts)/(npts-1)); |
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printf(" %9.2f %9.3f", ysum/npts, d1); |
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break; |
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case 'm': |
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printf(" %9.2f %9.2f", ymin, ymax); |
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break; |
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case 'i': |
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printf(" %9.2f", rsum); |
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break; |
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case 'l': |
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d3 = xxsum - xsum*xsum/npts; |
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d1 = (xysum - xsum*ysum/npts)/d3; |
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d2 = (ysum - d1*xsum)/npts; |
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d3 = d1*sqrt(d3/(yysum - ysum*ysum/npts)); |
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printf(" %9.5f %9.2f %9.5f", d1, d2, d3); |
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break; |
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default: |
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break; |
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} |
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printf("\n"); |
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} |
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|
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|
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void |
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calcpoint( /* add a point to our calculation */ |
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int c, |
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double x, |
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double y |
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) |
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{ |
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if (x < xmin || x > xmax) |
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return; |
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|
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xsum += x; |
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xxsum += x*x; |
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ysum += y; |
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yysum += y*y; |
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xysum += x*y; |
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|
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if (npts) { |
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if (y < ymin) |
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ymin = y; |
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else if (y > ymax) |
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ymax = y; |
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} else |
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ymin = ymax = y; |
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|
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if (npts) |
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rsum += ( y + lasty )*( x - lastx )/2.0; |
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lastx = x; |
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lasty = y; |
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|
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npts++; |
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} |
