I before E except after C: Difference between revisions
→{{header|MATLAB}}: Provided a full solution in MATLAB
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</syntaxhighlight>
=={{header|
<syntaxhighlight lang="matlab">
function iBeforeE()
check('http://wiki.puzzlers.org/pub/wordlists/unixdict.txt');
fprintf('\n');
check('http://ucrel.lancs.ac.uk/bncfreq/lists/1_2_all_freq.txt');
end
function check(URL)
fprintf('For %s:\n', URL)
[~, name, ext] = fileparts(URL);
if exist(fn,'file')
lines = readlines(fn, 'EmptyLineRule', 'skip');
else
fprintf('Reading data from %s\n', URL)
lines = readlines(URL, 'EmptyLineRule', 'skip');
% Save the file for later
writelines(lines,fn);
end
includesFrequencyData = length(split(lines(1))) > 1;
ie = 0;
cie = 0;
ei = 0;
cei = 0;
for i = 1:size(lines,1)
if includesFrequencyData
fields = split(strtrim(lines(i)));
if length(fields) ~= 3 || i == 1
continue;
end
word = fields(1);
frequency = str2double(fields(3));
else
word = lines(i);
frequency = 1;
end
ie = ie + length(strfind(word,'ie')) * frequency;
ei = ei + length(strfind(word,'ei')) * frequency;
cie = cie + length(strfind(word,'cie')) * frequency;
cei = cei + length(strfind(word,'cei')) * frequency;
end
rule1 = "I before E when not preceded by C";
p1 = reportPlausibility(rule1, ie-cie, ei-cei );
rule2 = "E before I when preceded by C";
p2 = reportPlausibility(rule2, cei, cie );
combinedRule = "I before E, except after C";
fprintf('Hence the combined rule \"%s\" is ', combinedRule);
if ~(p1 && p2)
fprintf('NOT ');
end
fprintf('PLAUSIBLE.\n');
end
function plausible = reportPlausibility(claim, positive, negative)
fprintf('\"%s\" is ', claim);
if positive <= 2*negative
plausible = false;
fprintf('NOT ')
end
fprintf('PLAUSIBLE,\n since the ratio of positive to negative examples is %d/%d = %0.2f.\n', positive, negative, positive/negative )
end
</syntaxhighlight>
<pre>
>> iBeforeE
For http://wiki.puzzlers.org/pub/wordlists/unixdict.txt:
"I before E when not preceded by C" is PLAUSIBLE,
since the ratio of positive to negative examples is 466/217 = 2.15.
since the ratio of positive to negative examples is 13/24 = 0.54.
Hence the combined rule "I before E, except after C" is NOT PLAUSIBLE.
For http://ucrel.lancs.ac.uk/bncfreq/lists/1_2_all_freq.txt:
"I before E when not preceded by C" is NOT PLAUSIBLE,
since the ratio of positive to negative examples is 8207/4826 = 1.70.
since the ratio of positive to negative examples is 327/994 = 0.33.
Hence the combined rule "I before E, except after C" is NOT PLAUSIBLE.
</pre>
=={{header|Modula-2}}==
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