add rounding of digits to riemann and aprox routes

app.py

@@ -76,23 +76,23 @@ def riemann():
         #           of inputs, outputs, and areas (their products)
 
         value = latex(f)
-        dx = (ub - lb) / si
+        dx = round((ub - lb) / si, 3)
         inputs = list()
         if sumtype == "1":
             for i in range(0, si):
-                inputs.append(dx * (i))
+                inputs.append(round(dx * (i), 3))
         if sumtype == "2":
             for i in range(0, si):
-                inputs.append(dx * (i + 1))
+                inputs.append(round(dx * (i + 1), 3))
         outputs = list()
         for input in inputs:
             temp = f.subs(x, input)
-            outputs.append(temp)
+            outputs.append(round(temp, 3))
         rectangles = list()
         for output in outputs:
             temp = output * dx
-            rectangles.append(temp)
-        result = sum(rectangles)
+            rectangles.append(round(temp, 3))
+        result = round(sum(rectangles), 3)
 
         # Choose template based on left or right sum
         if sumtype == "1":
@@ -179,11 +179,13 @@ def aprox():
         if not h.is_number:
             return apology("difficult value must be a number", 400)
 
+        a = round(a, 3)
+        h = round(h, 3)
         # Run through Linearization algorithm
         fprime = f.diff(x)
-        fa = f.subs(x, a)
-        fprimea = fprime.subs(x, a)
-        lh = fa + fprimea*(float(h)-float(a))
+        fa = round(f.subs(x, a), 3)
+        fprimea = round(fprime.subs(x, a), 3)
+        lh = round(fa + fprimea*(float(h)-float(a)), 3)
 
         # Convert to latex for MathJax reading
         value = latex(f)

helpers.py

@@ -2,7 +2,6 @@ import requests
 
 from flask import redirect, render_template, request, session
 from functools import wraps
-from sympy import *
 
 
 def apology(message, code=400):
@@ -37,10 +36,3 @@ def login_required(f):
 def usd(value):
     """Format value as USD."""
     return f"${value:,.2f}"
-
-def setup_symbols(f):
-    f = sympify(f)
-    for letter in [x, y, z, t, X, Y, Z, T]:
-        f = f.subs(letter, x)
-
-    return f