Initial data commit

Task/Euler-method/Groovy/euler-method-4.groovy

@@ -0,0 +1,14 @@
+[10, 5, 2].each { h ->
+    def tEuler = tEulerH.rcurry(h)
+    assert tEuler.maximumNumberOfParameters == 2
+    println """
+STEP SIZE == ${h}
+  time   analytic   euler   relative
+(seconds)  (°C)     (°C)     error
+-------- -------- -------- ---------"""
+    tEuler(0, 100).each { BigDecimal s, tE ->
+        def tA = tAnalytic(s)
+        def relError = ((tE - tA)/(tA - 20)).abs()
+        printf('%5.0f    %8.4f %8.4f %9.6f\n', s, tA, tE, relError)
+    }
+}