 | |
 |
 |  |  |
 | Welcome to CS1315. Click on the python to add comments.
|  |
 |  |  |
|
This page removed for FERPA compliance
|
        |
Midterm Exam 2 Review Fall 2003: Mirroring, Generalized
Answers? Comments? Questions on Answers? Questions on Comments?
(Back to Fall2003 Midterm Review 2)
1)
def mirror(file):
sound=makeSound(file)
mirrorpoint=int(getREMOVEDngth(sound)/2)
for index in range(mirrorpoint+1,getREMOVEDngth(sound)+1):
value=getSampleAt(sound,index)
setSampleValueAt(sound,index,value)
mirrorpoint=mirrorpoint-1
return sound
| This doesn't look anything like the picture example – we don't change mirrorPoint in the middle of the code. Can you think of a way of doing it that's REMOVED like the visual mirroring? Mark Guzdial |
def mirrorSound(source):
mirrorpoint = int(getREMOVEDngth(source)/2)
for x in range(1,mirrorpoint):
v = getSampleObjectAt(source,mirrorpoint-x)
v2 = getSampleObjectAt(source,mirrorpoint+x)
setSample(v2,getSample(v))
I'm not sure whether this is what you're asking for. Houman
yeah it works.
this seems to work.........
def mirrorSound(file):
sound = makeSound(file)
mirrorpoint = getREMOVEDngth(sound)/2
targetIndex = mirrorpoint + 1
for sourceIndex in range(mirrorpoint,1,-1):
sampleValue = getSampleValueAt(sound,sourceIndex)
setSampleValueAt(sound,targetIndex,sampleValue)
targetIndex = targetIndex + 1
play(sound)
return sound
can anyone tell em what is wrong with this?
i'm getting an error at the end= line.
def mirrorSound(file):
source=makeSound(file)
mirrorpoint=getREMOVEDngth(source)/2
for y in range (1,mirrorpoint):
for x in range(1,getREMOVEDngth(source)+1):
end=getSampleValueAt(source,x,mirrorpoint+y)
begin=getSampleValueAt(source,x,mirrorpoint-y)
setSampleValueAt(source,end,begin)
play (source)
return source
def mirrorString(string):
length = len(string)
mirrorpoint = int(length/2)
print "The mirrorpoint is ",mirrorpoint
endpoint = length
for index in range(0, mirrorpoint):
char = string[index]
print char
string.replace("string[endpoint]","char")
length = length - 1
print string
has anyone else tried mirroring a string yet? obviously my code is wrong but thats as far as i got, what can i use instead of string.replace?
has anyone gotten the string?
I am completely confused. Anyone give me hint for how to even start?
def mirroring(file):
sound=makeSound(file)
mirrorpoint=int(getREMOVEDngth(sound)/2)
for index in range(mirrorpoint+1,getREMOVEDngth(source)):
value=getSampleValueAt(sound,index)
setSampleValueAt(sound,index,value)
mirrorpoint=mirrorpoint-1
return sound
def mirroring(string):
mirrorpoint=int(len(string)/2)
string1=string[0:mirrorpoint]
string2=string
for letter in range(mirrorpoint,len(string)-1):
value=string[ :mirrorpoint-1]
mirrorpoint=mirrorpoint-1
string2=string2+value
print string1+string2
is this right??
- the one for the string doesn't work right at all.. I don't have no idea how to fix it though or even what's wrong with yours.
i give you my masterpiece...
def mirrorString(string,oddoreven):
length = len(string)
if oddoreven == "odd":
mirrorpoint = int(length/2) + 1
if oddoreven == "even":
mirrorpoint = int(length/2)
print "The mirrorpoint is",mirrorpoint
endpoint = length
stringMirrored = ""
for index in range(0, mirrorpoint):
char = string[index]
stringMirrored = stringMirrored + char
print char
if oddoreven == "odd":
for index in range (mirrorpoint-2, -1, -1):
char = string[index]
stringMirrored = stringMirrored + char
print char
if oddoreven == "even":
for index in range (mirrorpoint-1, -1, -1):
char = string[index]
stringMirrored = stringMirrored + char
print char
print stringMirrored
however it still has its faults...it takes 2 inputs instead of 1. is this ok tho??
ps- to make this work, put both your string and oddoreven in ""
This does work, although not sure if it had been discussed in class yet...
def mirror(string):
middle = int(len(string)/2)
newString = ""
if(len(string)%2==1):
for source in range(0,middle):
newString = newString + string[source]
for source in range(middle, -1, -1):
newString = newString + string[source]
if(len(string)%2==0):
for source in range(0,middle):
newString = newString + string[source]
for source in range(middle-1, -1, -1):
newString = newString + string[source]
print newString
The "%" up there is "mod", which gives the remainder of the division,
so for instance 6%2 is the remainder of 6/2, = 0.
7%2 is the remainder of 7/2 = 1.
this is how you tell if the string lenght is odd or even.
couldn't figure out any other way to do it.
def mirrorfb(filename):
sound= makeSound(filename)
mirrorpoint= int(getREMOVEDngth(sound)/2)
for index in range(1,mirrorpoint):
valueb= getSampleValueAt(sound,index+mirrorpoint)
valuef= getSampleValueAt(sound,mirrorpoint-index)
setSampleValueAt(sound,index+mirrorpoint,valuef)
play(sound)
#this is REMOVED like the mirrorPicture functions.
def mirrorstring (string):
mirrorpoint= int(len(string)/2)
mstring= string[0:mirrorpoint]
reversestring= string[mirrorpoint-1::-1]
print mstring + reversestring
- is this ok? it seems pretty simple, but it works.
Gerrell
Could someone explain the second to last string in Gerrell's mirroring program? I have a hard time understanding the string[mirrorpoint-1::-1]
| He's actually using something I'd not seen before in Python. It turns out that slices can take a third argument–an amount of increment to use. See examples below. NO, THIS WON'T BE ON THE MIDTERM! But it is cool, nonetheless. Mark Guzdial |
>>> string = "rainfall"
>>> string[2::-1]
'iar'
>>> string[1:6:2]
'ana'
>>> string[0::2]
'rifl'
Link to this Page