P4 Grade

[ericbr...@cmu.edu]

Hi,

I looked on afs but could not find a description of why I received a 75%
on P4. Is this information available? I thought my project was fully
working.

Thanks,
Eric

[mbec...@andrew.cmu.edu]

Professor Blanton,

Here is a reply you could send to Eric, let me know if you need any more
information or explanation.

Thanks,
Matthew



Hello Eric,

Sorry for the delay, we are still preparing the feedback from project 4,
and have not yet placed it into AFS. However, here is your feedback:

Grading Matrix:
Correct Check Node (Part A) 15/15
Correct Variable Node (Part A) 5/15
Correct Check Node (Part B) 20/20
Correct Variable Node (Part B) 5/20
Coding Style 10/10
Testbenches 5/ 5
Report 15/15
-----------
Total 75/100

You only lost points on the variable nodes, which did not work correctly.
However, your good design earned you some partial credit for those two
sections. For example, here are some logs from the testbench when it ran
on your variable node:

Error detected (test 0)!
Inputs: 0110 0111 (symbol: 0)
Outputs: 0001 0001
Expected: 0110 0101

Error detected (test 1)!
Inputs: 0110 1110 (symbol: 0)
Outputs: 0001 0001
Expected: 1101 0101

We see that for the first example with test 0, the input values are +6 and
+7 (with a symbol of 0, which means lambda is -1). Since the variable
function is to sum the other inputs plus the original lambda, the first
output should be +7 + -1 = +6, and the second output should be +6 + -1 =
+5. Similarly, for the second test, the inputs are +6 and -2 (symbol = 0
again means lambda is -1), so the outputs should be -2 + -1 = -3 and +6 +
-1 = +5.

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[mbec...@andrew.cmu.edu]

Thanks,
Matthew Beckler
18340 System Staff

On Tue, May 14, 2013 10:30 am, ericbr...@cmu.edu wrote: