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Comments for Week of Jan. 19, 2004

How's it goin'?


Comments, questions, issues, rants, complaints, praise, or gripes?


How is it possible I got an 80 on lab 1 when i followed the directions to the dot?
Right – you need to ask your TA. It may be a misunderstanding. Mark Guzdial

I had trouble turning in my lab 2 assignment, and I haven't been able to get in contact with anyone. Even after countless tries and reboots I wasn't able to get it to work properly. How do I fix the problem, and make sure this doesn't happen again? gtg701r
You certainly can always contact someone over the week that something is due – via email, via IM (for some of us), via CoWeb. My suggestion is to meet with your TA (at breakout or office hours) and get help with making it work. (Rebooting should be necessary.) Maybe there's a mistake with how we have you in the grading system. But unless we hear from you, we can't fix it. Mark Guzdial

what is pre-quiz 1?
It is a review for quiz 1 on Monday. You take it home and turn it in before the quiz in class Monday. It is worth 20/100 of your quiz 1 points. Student521
I tried to turn in my Lab3 assignment this morning, but the pull-down under assignments just shows "assignments". Any ideas? gte695v
That means that either your Internet connection was down or the server was down. You MUST be connected to the Internet BEFORE you do Turnin-Assignment. Mark Guzdial
I tried to turn in Lab3 this morning also and it didnt work. I have tried it at 3 different places including the library...with and without the cd. gte257w
That suggests that you're setting up the Turnin-Register wrong. Remember that it's your PRISM/MAIL ID, NOT your GTid (9 digit number). And don't type your password anywhere. Mark Guzdial
I have also been trying to turn in lab one and it is not working gte142t
It can work – we have several hundred turned in already. Follow the directions exactly from the Lab description. Mark Guzdial
I am able to bring up the list of assignments now (3:55pm). I'm not an expert on turnin, but I know that this problem can occur when you have no network connection, or the server is down. The best advice I can give is to try again.
Colin Potts

My problem with the turnin was an internet connection problem- my firewall was a little overprotective (even though email/explorer worked fine). I restarted my computer and then it worked fine because then it asked if JES could access the internet. gte695v Student1140
Excellent! (Please sign your name – I don't know anyone by "gte695v" :-) Mark Guzdial
For pre-quiz 1, when calculating the partial negative value for a number greater than 64 I am left with a negative. You can't have a negative value because it is outside of the color range right?
Two hints: (a) Think like a computer (i.e. not a person with lots of common sense). (b) Try it out in JES. Colin Potts

are the materials covered in quiz 1 on monday just from our lecture slides? i am trying to get a feel for what to know, and in how much detail. thanks...
If you understand and can do everything on the pre-quiz, you should feel sufficiently prepared for the quiz. It will probably help to look over the slides as well, but it won't be over anything you haven't seen. Student117
For Pre-Quiz one, I have two theories about what to do with the negative number and I can't seem to get a definite answer about which is right. 1) it goes to 0. ( this was suggested to me by one TA) 2) It wraps around ( like a number above 255 would) (This was suggested to me by another TA) Can anyone give me a definite answer? gtg151b
Try it by copying the code in the last example of the pre-quiz and running with a picture. Use the Picture Tools option under Media Tools in your JES toolbar to look at the value of one of the pixels before and after you run the program. Hint: It doesn't go to 0, it "wraps around", and remember there are 256 possbile patterns of color in pictures–ranging from 0-255 for each color. Student117
I'm still struggling with part a as well. I wrote a program for it in JES that works, and it did not change any of the values. Is this what's supposed to happen?
The only way it will work is if the distance between the color values is a certain amount. ie. Using the distance formula that was talked about in class one day, find the distance between light blue (0,0,128) and whatever the value of blue is in a certain pixel. If that distance is less than 100, the value will change. Student117
So, in response to the previous question, REMOVEDmmer, the blue is what we're checking, but we're not changing the blue, just changing the red based on what the blue value is? I love commas by the way, commas. –Thomas Sobeck
Right, well you're changing the red value based on the distance between the two blue values.

For problem number one in the pre-quiz the first problem asks if it is the distance is than 100, does this mean just less than, or less than and equal to? –Amanda REMOVED
If it says it's just less than, less than or equal to is written =. Student117
When the values "wrap around" do they start from 255 or do they go back up from zero?
By wrap around I mean they will go up to the highest number and subtract from the top–but the number is not 255–try it with a picture!! Student117

Just so you guys know (in case this has never been brought up before). I am trying to open a folder that begins with brackets ( D:\[Galleries] ) and JES is not recognizing it as a folder in the file selection box but a file. So those that are trying to access that kind of folder are not able even gain access to that folder. Any workarounds or is it up to the user to move the file?
When I type in the program from part B. nothing happens. What am I missing? I tried to define the picture with
file=r"C:\JES\MediaSources\flower1.JPG"
picture=makePicture(file)
but no picture comes up, even after JES doesn't give me any errors.
Also, I understand the concept of wrapping around, but if we don't subtract from 255, how do we figure out what to subtract from?
PS My e-mail is gte471z.


I also tried to write a program for part b, and came up with the same problem. Even after I fixed any errors in it, it would not produce a new picture or new values.
Did you type show(picture) and repaint(picture)? Unlike some of your other codes, these are not included in this program, so you have to type them in the command area. Also, the picture will show up when you go to MediaTools and Picture Tools and choose what you have called the picture and repeat this after running the code to see the new picture. This is how you figure out what to subtract from, click on one pixel in these pictures and compare the values.
I live off campus and if I have to turn in all my assignments for this class somewhere on campus it will be a huge inconveinence for me. is it possible someone could set up the system so we "off-campus" people will not have to make EXTRA arrangements. If not I understand but it would be nice.

I think that it would be nice if the pre-quiz was given to us on Mondays so that we could have an opportunity to discuss the problems in our breakout sessions and with our TA's. We can't do that on the weekends.
You should be able to turn in through JES off campus just as easily as you can on campus. If it's not working, maybe you have something configured wrong, or are using an over-protective firewall. REMOVED those things out. If you're still having troubles, send me an email and we'll get it straightened out. Student57


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