From 3a41897ba2ce28bcc4071e71cd2892c6c3a5d7f5 Mon Sep 17 00:00:00 2001
From: 123 <629825095@qq.com>
Date: Sat, 14 Jun 2025 13:35:33 +0800
Subject: [PATCH] 111

---
 279-3.py | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/279-3.py b/279-3.py
index 9c81095..f3b5fa6 100644
--- a/279-3.py
+++ b/279-3.py
@@ -12,15 +12,15 @@ def ClassicRK(x0,y0,h,xk,fxy):
         result.append((x0,y0))
     return result
 
-
+#把下面参数换成题干的#################
 if __name__=="__main__":
-    x0 = 0
-    y0 = -1
-    fxy = lambda x,y: x + y
-    real_fx = lambda x: -x-1
-    h = 0.1
-    xk = 2
+    x0 = 0   #x的左边界换成题干里面的#################
+    y0 = -1  #y的初始值换成题干里面的#################
+    fxy = lambda x,y: x + y    #f(x,y)换成题干里面的#################
+    real_fx = lambda x: -x-1     #真实函数换成题干里面的#################
+    h = 0.1         #步长换成题干里面的#################
+    xk = 2           #x的右边界换成题干里面的#################
     result = ClassicRK(x0, y0, h, xk, fxy)
-    print("x\ty\t\treal_y")
+    print("x\ty\t\treal_y\t\t\t误差")
     for x, y in result:
-        print(f"{x:.2f}\t{y}\t{real_fx(x)}")
\ No newline at end of file
+        print(f"{x:.2f}\t{y:.10f}\t\t{real_fx(x):.10f}\t\t\t{abs(y - real_fx(x)):.5f}")
\ No newline at end of file