ENG1060 Computing

[JinXi]

Thanks for that man, working fine now 

=o thought you swapped your inequality sign.

Anyway the answers are 25 for the 1st and 6 for the 2nd.

Should be fine if you get them.

[sajib_mostofa]

The lab demonstrator who marked me is an idiot. Takes a mark off just cos I didnt display the output to all of my m-files in the command window. Robbed me of a 10. 

[sajib_mostofa]

For 1d of the assignment, how do you calculate the squared error?

[JinXi]

For 1d of the assignment, how do you calculate the squared error?

I just went (z_pred - z_raw).^2. Where z_pred and z_raw is a matrix making up your left wall Up until the point of intersection between the left and right wall.

[taiga]

Squared error is just deviation from the actual value, so yeah Jinxi is right

[sajib_mostofa]

So should z_pred matrix be the same dimensions as z_raw?

[xZero]

I used the best fitted z value and the average of the z value to find the squared error and after you use imshow it should have a red bit on the left of the line

[sajib_mostofa]

I'm confused as to what our final result is meant to be. Is it meant to look like an actual doorhandle or just one single line of pixels?

[xZero]

just a line of pixel with different colour, the 'glowing' part is the doorhandle. btw anyone done 2b? do you have to use a different threshold value for every image? if so how do i put that into my loop? thanks

[sajib_mostofa]

For Q2a of assigment, do we just have to read the numeric data or do we need to read the textdata as well?

[JinXi]

For Q2a of assigment, do we just have to read the numeric data or do we need to read the textdata as well?

just the numerical data. We did this in PASS ages ago, just use importdata, then go into your command window, double click the variable u assigned the data into and there would be a 'subname' Eg. data.data. You can just treat is as a new variable, meaning you and index it etc.

[m@tty]

just a line of pixel with different colour, the 'glowing' part is the doorhandle. btw anyone done 2b? do you have to use a different threshold value for every image? if so how do i put that into my loop? thanks

I got http://imageshack.us/photo/my-images/35/part1dj.jpg/ for part 1 (d) Not just a single line..

haven't done 2b yet... if so, that's really annoying.

[JinXi]

bleh Im quite sure I did 2b right but My value for 1993 is off the ssa line from part a by about 10km^2... thats the nearest i can get it with the threshold value's given..

Anyway for part 2e, anyone get the ssa hits 0 during 2014 for polynomial and during 2021 for ODE?

Edit: got 2013 for the polynomial. Did a stupid error

[xZero]

Yup got that for 2e:) and yeah for 2b the values are way off. Also m@tty how did you get that image? I just found the error between the estimated z value and the average z value, any hints?

[sajib_mostofa]

For Q1b, can anyone tell me what average we are trying to plot? Is it the average of the data that has had the last 8 columns removed, the raw data with all the noise or the data that with every 10th point addressed?