From fbc4dc293cd09d795f62db3203af80cf1eb44531 Mon Sep 17 00:00:00 2001
From: Julian Weigt <juw@posteo.de>
Date: Tue, 20 Jan 2026 12:37:08 +0100
Subject: Add code to print also derivatives.

---
 charf.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

(limited to 'charf.c')

diff --git a/charf.c b/charf.c
index ad2da3b..4ffbb54 100644
--- a/charf.c
+++ b/charf.c
@@ -220,15 +220,40 @@ void format_result(char* s, int index, int k, EXPTYPE p, VALUETYPE r, int format
 		root_to_string(rts,r,p);
 		l += sprintf(s+l,"|f^(%2d)|_%s: %s",k,e,rts);
 		/*Compute and print also Mf.*/
+		/*Compute and print also df and dMf.*/
 		/*
 		VALUETYPE Mf[N];
 		compute_maximalfunction(f, Mf, d);
-		l += sprintf(s+l,"\nMf: ");
+		l += sprintf(s+l,"\nM: ");
 		for(int i=0; i<d; i++){
 			char v[8];
 			valuetype_to_string(v,Mf[i]);
 			l += sprintf(s+l,"%s ",v);
 		}
+		VALUETYPE df[2][N];
+		VALUETYPE dMf[2][N];
+		for(int i=0; i<=1; i++){
+			for(int n=0; n<d; n++){
+				df[i][n] = f[n];
+				dMf[i][n] = Mf[n];
+			}
+		}
+		for(int m=0; m+1<=k; m++){
+			differentiate(df[(m+1)%2],df[m%2],d,1);
+			differentiate(dMf[(m+1)%2],dMf[m%2],d,1);
+			l += sprintf(s+l,"\nf%d: ",m+1);
+			for(int i=0; i<d; i++){
+				char v[8];
+				valuetype_to_string(v,df[(m+1)%2][i]);
+				l += sprintf(s+l,"%s ",v);
+			}
+			l += sprintf(s+l,"\nM%d: ",m+1);
+			for(int i=0; i<d; i++){
+				char v[8];
+				valuetype_to_string(v,dMf[(m+1)%2][i]);
+				l += sprintf(s+l,"%s ",v);
+			}
+		}
 		*/
 	}
 	else if(format == FORMAT_LATEX){
-- 
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