From 9477dbe667f250ecd23f8fc0d56b942191526421 Mon Sep 17 00:00:00 2001
From: Franciszek Malinka <franciszek.malinka@gmail.com>
Date: Thu, 25 Feb 2021 14:42:55 +0100
Subject: Stare semestry, niepoukladane

---
 Semestr 3/anm/numerki/lista1/test.jl     | 118 +++++++++++++++++++++++++++++++
 Semestr 3/anm/numerki/lista1/test.jl.txt |  16 +++++
 2 files changed, 134 insertions(+)
 create mode 100644 Semestr 3/anm/numerki/lista1/test.jl
 create mode 100644 Semestr 3/anm/numerki/lista1/test.jl.txt

(limited to 'Semestr 3/anm/numerki/lista1')

diff --git a/Semestr 3/anm/numerki/lista1/test.jl b/Semestr 3/anm/numerki/lista1/test.jl
new file mode 100644
index 0000000..235800a
--- /dev/null
+++ b/Semestr 3/anm/numerki/lista1/test.jl	
@@ -0,0 +1,118 @@
+using Random
+
+function prettyfloat64(f)
+    ss = bitstring(f)
+    s = ss[1]
+    c = ss[2:12]
+    m = ss[13:end]
+    return string(s, " ", c, " ", m)
+end
+
+function string_to_float64(st)
+    s = st[1]
+    c = st[2:12]
+    m = st[13:end]
+
+    if s == '0'
+        s = 1.0
+    else
+        s = -1.0
+    end
+
+    c = parse(Int, string("0b", c))
+    c = 2.0^(c - 1023)
+    m = Float64(parse(Int64, string("0b", m))) / Float64(2^52) + 1.0
+    return s * c * m
+end
+
+rng = MersenneTwister(123)
+
+function rand_f64_bitstring()
+    return randstring(rng, ['0', '1'], 64)
+end
+
+function test_string_to_float()
+    for i in 1:100000
+    # st = rand_f64_bitstring()
+        st = rand(rng)
+        res = string_to_float64(bitstring(st))
+        println(string(st, " -> ", prettyfloat64(st), " -> ", res))
+        if bitstring(res) == bitstring(st)
+            println("OK")
+        else
+            println("ZJEBALO SIE")
+            break
+        end
+    end
+end
+
+function find_felerny_x()
+    while true    
+        x = rand(rng) + 1.0
+        res = x * (1.0 / x)
+        if res != 1.0
+            println(string("Znalazlem! ", x))
+            return x
+        end
+    end
+end
+
+function find_felerne_iksy(iterations)
+    bad_xs = 0
+    for i in 1:iterations
+        x = rand(rng) + 1.0
+        res = x * (1.0 / x)
+        if res != 1.0
+            bad_xs += 1
+        end
+    end
+    println("Znalazlem ", bad_xs, " felernych iksow, czyli ", bad_xs / iterations * 100.0, "% wszystkich losowanych wartosci.")
+end
+
+# find_felerne_iksy(10000000)
+
+
+function rel_error(x, rx)
+    x  = Float64(x)
+    rx = Float64(rx)
+    relative = abs((x - rx) / x)
+    return relative
+end
+
+function test_poly(t, poly, x=4.71, exact=-14.636489)
+    println("Testing poly \"", poly, "\" with float type ", t, ".")
+    res = poly(x, t)
+    println(poly, "(", x, ") = ", res)
+    println("Relative error (exact: ", exact, "): ", rel_error(exact, res))
+end
+
+function w(x, t)
+    x = t(x)
+    return x^3 - (t(6)) * (x^2) + (t(3)) * x - t(0.149)
+end
+
+function w2(x, t)
+    x = t(x)
+    return ((x - t(6)) * x + t(3)) * x - t(0.149)
+end
+    
+    
+function task3()
+    println("Task3: ")
+    
+    test_poly(Float16, w)
+    println()
+    test_poly(Float32, w)
+    println()
+    test_poly(Float64, w)
+    println()
+
+    test_poly(Float16, w2)
+    println()
+    test_poly(Float32, w2)
+    println()
+    test_poly(Float64, w2)
+    println()
+end
+
+
diff --git a/Semestr 3/anm/numerki/lista1/test.jl.txt b/Semestr 3/anm/numerki/lista1/test.jl.txt
new file mode 100644
index 0000000..81b4901
--- /dev/null
+++ b/Semestr 3/anm/numerki/lista1/test.jl.txt	
@@ -0,0 +1,16 @@
+function string_to_float64(st)
+  s = st[1]
+  c = st[2:12]
+  m = st[13:end]
+
+  if s == '0'
+      s = 1.0
+  else
+      s = -1.0
+  end
+  
+  c = parse(Int, string("0b", c))
+  c = 2.0 ^ (c - 1023)
+  m = Float64(parse(Int64, string("0b", m))) / Float64(2^52) + 1.0
+  return s * c * m
+end
-- 
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