Hi,
I'm currently working on the following exercise:
---
You have given the following function:
def f2(i, j, k):
return ((i | j) & k) | (i & j)
Find a useful utilization for this function.
---
Actually I couldn't figure out so far, what exactly is
a "useful utilization". Can anybody of you help me?
Thanks!
Regards
Karl
[P.S. I have even written a small program, which should
show me, what this formula does with numbers, but I couldn't
find anything "interestin g" or regular in the output-file.
This is the source of the program:
---
import string
def testit(i, j, k):
return ((i | j) & k) | (i & j)
q = []
results = [[], [], [], [], [], [], [], [], [], []]
fout = open("out.txt", "w")
for x in range(10):
for y in range(10):
for z in range(10):
a = [x, y, z]
a.sort()
if a in q:
continue
else:
results[testit(x, y, z)].append([x, y, z])
q.append(a)
for x in range(len(resul ts)):
for y in range(len(resul ts[x])):
fout.write(stri ng.strip(str(re sults[x][y]), "[]")+" : "+str(x)+'\ n')
---
I guess I just have to construct some kind of situation there this
function could be useful but I don't have any ideas. :(
16  1243 
Karl Pech wrote: Hi,
I'm currently working on the following exercise:
---
You have given the following function:
def f2(i, j, k):
return ((i | j) & k) | (i & j)
Find a useful utilization for this function.
---
Actually I couldn't figure out so far, what exactly is
a "useful utilization". Can anybody of you help me?
Thanks!
Regards
Karl
[P.S. I have even written a small program, which should
show me, what this formula does with numbers, but I couldn't
find anything "interestin g" or regular in the output-file.
This is the source of the program:
---
import string
def testit(i, j, k):
return ((i | j) & k) | (i & j)
q = []
results = [[], [], [], [], [], [], [], [], [], []]
fout = open("out.txt", "w")
for x in range(10):
for y in range(10):
for z in range(10):
a = [x, y, z]
a.sort()
if a in q:
continue
else:
results[testit(x, y, z)].append([x, y, z])
q.append(a)
for x in range(len(resul ts)):
for y in range(len(resul ts[x])):
fout.write(stri ng.strip(str(re sults[x][y]), "[]")+" : "+str(x)+'\ n')
---
I guess I just have to construct some kind of situation there this
function could be useful but I don't have any ideas. :(
((i | j) & k) | (i & j)
i j k f
- - - -
0 0 0
0 0 1
0 1 0
0 1 1 1 (i | j) & k
1 0 0
1 0 1 1
1 1 0 1 (i & j)
1 1 1 1 (i & j)
Karl,
Hum; could it be true where 2 or more of i,j,k are
true?
wes
Sure wish this group was around to help me
with my homework when I was taking CS 101
back 30 years ago <grin>.
Larry
"wes weston" <ww*****@att.ne t> wrote in message
news:JS******** **********@bgtn sc05-news.ops.worldn et.att.net... Karl Pech wrote: Hi,
I'm currently working on the following exercise:
---
You have given the following function:
def f2(i, j, k):
return ((i | j) & k) | (i & j)
Find a useful utilization for this function.
---
Actually I couldn't figure out so far, what exactly is
a "useful utilization". Can anybody of you help me?
Thanks!
Regards
Karl
[P.S. I have even written a small program, which should
show me, what this formula does with numbers, but I couldn't
find anything "interestin g" or regular in the output-file.
This is the source of the program:
---
import string
def testit(i, j, k):
return ((i | j) & k) | (i & j)
q = []
results = [[], [], [], [], [], [], [], [], [], []]
fout = open("out.txt", "w")
for x in range(10):
for y in range(10):
for z in range(10):
a = [x, y, z]
a.sort()
if a in q:
continue
else:
results[testit(x, y, z)].append([x, y, z])
q.append(a)
for x in range(len(resul ts)):
for y in range(len(resul ts[x])):
fout.write(stri ng.strip(str(re sults[x][y]), "[]")+" : "+str(x)+'\ n')
---
I guess I just have to construct some kind of situation there this
function could be useful but I don't have any ideas. :(
((i | j) & k) | (i & j)
i j k f
- - - -
0 0 0
0 0 1
0 1 0
0 1 1 1 (i | j) & k
1 0 0
1 0 1 1
1 1 0 1 (i & j)
1 1 1 1 (i & j)
Karl,
Hum; could it be true where 2 or more of i,j,k are
true?
wes
Hello Karl,
I don't know the answer, but you can rewrite the expresion like this
return (i & k) | (j & k) | (i & j)
with the same meaning: all the combinations.
Supposing the variables are just plain booleans, f2 returns true if any two
of the three variables are true (or all three). It returns false if two
variables are false, or all the three are false.
My next suggestion is, maybe they are not integers. They might as well be
booleans.
jbar
"Karl Pech" <Ka******@users .sf.net> writes: I'm currently working on the following exercise:
---
You have given the following function:
def f2(i, j, k):
return ((i | j) & k) | (i & j)
Find a useful utilization for this function.
---
Depending on k, you either get i & j or i | j. It is left as an
exercise to find out why. Don't know if it's really useful, however.
Greetings from your friendly Usenet homework department,
Heike
Hey again,
this f2 might be useful when doing the binary addition:
def addthem(m, n):
"""m + n"""
transition = 0
result = []
while m | n | transition:
transition = f2(m & 1, n & 1, transition)
result.insert(0 , (m ^ n ^ transition) & 1)
m >>= 1
n >>= 1
return result
However, I don't know how to create an integer, because I need to insert the
current bit at the beginning of the result integer that is being created -
I don't know how to do it with just shifting operations, so I used the
list:-)
jbar
Just before I go to bed...
How real the utilization should be?
i - True, if your girlfriend #1 is at the door
j - True, if your girlfriend #2 is at the door
k - True, if your girlfriend #3 is at the door
if f2(i, j, k):
#real bummer!!
jbar
On 2004-07-14, Karl Pech <Ka******@users .sf.net> wrote: I'm currently working on the following exercise:
---
You have given the following function:
def f2(i, j, k):
return ((i | j) & k) | (i & j)
Find a useful utilization for this function.
---
Actually I couldn't figure out so far, what exactly is
a "useful utilization". Can anybody of you help me?
I'll help by reminding you that posting homework questions to
Usenet will likely get as many red herring responses as serious
ones. :) c.l.p tends to be a bit kinder towards that sort of
thing, but in other groups I've seen some brilliant "joke"
answers for homework questions.
--
Grant Edwards grante Yow! I'm an East Side
at TYPE...
visi.com
"Heike C. Zimmerer" <us********@hcz im.de> wrote in message news:<2l******* *****@uni-berlin.de>... "Karl Pech" <Ka******@users .sf.net> writes:
I'm currently working on the following exercise:
---
You have given the following function:
def f2(i, j, k):
return ((i | j) & k) | (i & j)
Find a useful utilization for this function.
---
Depending on k, you either get i & j or i | j. It is left as an
exercise to find out why. Don't know if it's really useful, however.
It's useful in digital logic: It represents the carry-out from a full
adder. Of course, Python already has a perfectly good + operator.
"Grant Edwards" <gr****@visi.co m> wrote in message
news:40******** **************@ newsreader.visi .com...
Hello Grant (and everybody else), ;) I'll help by reminding you that posting homework questions to
Usenet will likely get as many red herring responses as serious
ones. :) c.l.p tends to be a bit kinder towards that sort of
thing, but in other groups I've seen some brilliant "joke"
answers for homework questions.
Hehe, I know this, but I just hadn't any ideas so I posted the question
here.
I hoped that since I have wrote a small program for this task, everybody
would see that I actually worked on the task on my own but didn't get
anything
useful. That's still better than posting questions like: "how much is 2+2? I
don't
know the answer. :(", @)))
without trying to solve them on his own.
Anyway, thanks everybody for your help!
Regards
Karl This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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