# schneems/Octave

schneems committed Nov 25, 2011
1 parent c2a6de4 commit fe15dc032ec0851c5d8300595091c0b62632674a
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 @@ -0,0 +1,6 @@ +function g = sigmoid(z) +%SIGMOID Compute sigmoid functoon +% J = SIGMOID(z) computes the sigmoid of z. + +g = 1.0 ./ (1.0 + exp(-z)); +end
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 @@ -0,0 +1,34 @@ +function [C, sigma] = dataset3Params(X, y, Xval, yval) +%EX6PARAMS returns your choice of C and sigma for Part 3 of the exercise +%where you select the optimal (C, sigma) learning parameters to use for SVM +%with RBF kernel +% [C, sigma] = EX6PARAMS(X, y, Xval, yval) returns your choice of C and +% sigma. You should complete this function to return the optimal C and +% sigma based on a cross-validation set. +% + +% You need to return the following variables correctly. +C = 1; +sigma = 0.3; + +% ====================== YOUR CODE HERE ====================== +% Instructions: Fill in this function to return the optimal C and sigma +% learning parameters found using the cross validation set. +% You can use svmPredict to predict the labels on the cross +% validation set. For example, +% predictions = svmPredict(model, Xval); +% will return the predictions on the cross validation set. +% +% Note: You can compute the prediction error using +% mean(double(predictions ~= yval)) +% + + + + + + + +% ========================================================================= + +end
 @@ -0,0 +1,61 @@ +function x = emailFeatures(word_indices) +%EMAILFEATURES takes in a word_indices vector and produces a feature vector +%from the word indices +% x = EMAILFEATURES(word_indices) takes in a word_indices vector and +% produces a feature vector from the word indices. + +% Total number of words in the dictionary +n = 1899; + +% You need to return the following variables correctly. +x = zeros(n, 1); + +% ====================== YOUR CODE HERE ====================== +% Instructions: Fill in this function to return a feature vector for the +% given email (word_indices). To help make it easier to +% process the emails, we have have already pre-processed each +% email and converted each word in the email into an index in +% a fixed dictionary (of 1899 words). The variable +% word_indices contains the list of indices of the words +% which occur in one email. +% +% Concretely, if an email has the text: +% +% The quick brown fox jumped over the lazy dog. +% +% Then, the word_indices vector for this text might look +% like: +% +% 60 100 33 44 10 53 60 58 5 +% +% where, we have mapped each word onto a number, for example: +% +% the -- 60 +% quick -- 100 +% ... +% +% (note: the above numbers are just an example and are not the +% actual mappings). +% +% Your task is take one such word_indices vector and construct +% a binary feature vector that indicates whether a particular +% word occurs in the email. That is, x(i) = 1 when word i +% is present in the email. Concretely, if the word 'the' (say, +% index 60) appears in the email, then x(60) = 1. The feature +% vector should look like: +% +% x = [ 0 0 0 0 1 0 0 0 ... 0 0 0 0 1 ... 0 0 0 1 0 ..]; +% +% + + + + + + + + +% ========================================================================= + + +end
 @@ -0,0 +1,10 @@ +> Anyone knows how much it costs to host a web portal ? +> +Well, it depends on how many visitors you're expecting. +This can be anywhere from less than 10 bucks a month to a couple of \$100. +You should checkout http://www.rackspace.com/ or perhaps Amazon EC2 +if youre running something big.. + +To unsubscribe yourself from this mailing list, send an email to: +groupname-unsubscribe@egroups.com +
 @@ -0,0 +1,34 @@ +Folks, + +my first time posting - have a bit of Unix experience, but am new to Linux. + + +Just got a new PC at home - Dell box with Windows XP. Added a second hard disk +for Linux. Partitioned the disk and have installed Suse 7.2 from CD, which went +fine except it didn't pick up my monitor. + +I have a Dell branded E151FPp 15" LCD flat panel monitor and a nVidia GeForce4 +Ti4200 video card, both of which are probably too new to feature in Suse's default +set. I downloaded a driver from the nVidia website and installed it using RPM. +Then I ran Sax2 (as was recommended in some postings I found on the net), but +it still doesn't feature my video card in the available list. What next? + +Another problem. I have a Dell branded keyboard and if I hit Caps-Lock twice, +the whole machine crashes (in Linux, not Windows) - even the on/off switch is +inactive, leaving me to reach for the power cable instead. + +If anyone can help me in any way with these probs., I'd be really grateful - +I've searched the 'net but have run out of ideas. + +Or should I be going for a different version of Linux such as RedHat? Opinions +welcome. + +Thanks a lot, +Peter + +-- +Irish Linux Users' Group: ilug@linux.ie +http://www.linux.ie/mailman/listinfo/ilug for (un)subscription information. +List maintainer: listmaster@linux.ie + +