error in my stemming code

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prabi p
prabi p 2016-4-17
回答： Walter Roberson 2016-4-18
Error in porterdupe>step1ab (line 211)
if b(k) == 's'
Error in porterdupe (line 20)
x = step1ab(b, k, k0);
--------------------------------------------------
%function [stem] = porterdupe(y)
function stems = porterdupe(~)
t = simple();
global j;
b = t;
k = length(b);
k0 = 1;
j = k;
% With this if statement, strings of length 1 or 2 don't go through the
% stemming process. Remove this conditional to match the published
% algorithm.
%stem = simple(b);
if k > 2
% Output displays per step are commented out.
%disp(sprintf('Word to stem: %s', b));
x = step1ab(b, k, k0);
%disp(sprintf('Steps 1A and B yield: %s', x{1}));
x = step1c(x{1}, x{2}, k0);
%disp(sprintf('Step 1C yields: %s', x{1}));
x = step2(x{1}, x{2}, k0);
%disp(sprintf('Step 2 yields: %s', x{1}));
x = step3(x{1}, x{2}, k0);
%disp(sprintf('Step 3 yields: %s', x{1}));
x = step4(x{1}, x{2}, k0);
%disp(sprintf('Step 4 yields: %s', x{1}));
x = step5(x{1}, x{2}, k0);
%disp(sprintf('Step 5 yields: %s', x{1}));
stems = x{1};
end
end
% cons(j) is TRUE <=> b[j] is a consonant.
function c = cons(i, b, k0)
c = true;
switch(b(i))
case {'a', 'e', 'i', 'o', 'u'}
c = false;
case 'y'
if i == k0
c = true;
else
c = ~cons(i - 1, b, k0);
end
end
end
% mseq() measures the number of consonant sequences between k0 and j. If
% c is a consonant sequence and v a vowel sequence, and <..> indicates
% arbitrary presence,
% <c><v> gives 0
% <c>vc<v> gives 1
% <c>vcvc<v> gives 2
% <c>vcvcvc<v> gives 3
% ....
function n = measure(b, k0)
global j;
n = 0;
i = k0;
while true
if i > j
return
end
if ~cons(i, b, k0)
break;
end
i = i + 1;
end
i = i + 1;
while true
while true
if i > j
return
end
if cons(i, b, k0)
break;
end
i = i + 1;
end
i = i + 1;
n = n + 1;
while true
if i > j
return
end
if ~cons(i, b, k0)
break;
end
i = i + 1;
end
i = i + 1;
end
end
% vowelinstem() is TRUE <=> k0,...j contains a vowel
function vis = vowelinstem(b, k0)
global j;
for i = k0:j,
if ~cons(i, b, k0)
vis = true;
return
end
end
vis = false;
end
%doublec(i) is TRUE <=> i,(i-1) contain a double consonant.
function dc = doublec(i, b, k0)
if i < k0+1
dc = false;
return
end
if b(i) ~= b(i-1)
dc = false;
return
end
dc = cons(i, b, k0);
end
% cvc(j) is TRUE <=> j-2,j-1,j has the form consonant - vowel - consonant
% and also if the second c is not w,x or y. this is used when trying to
% restore an e at the end of a short word. e.g.
%
% cav(e), lov(e), hop(e), crim(e), but
% snow, box, tray.
function c1 = cvc(i, b, k0)
if ((i < (k0+2)) || ~cons(i, b, k0) || cons(i-1, b, k0) || ~cons(i-2, b, k0))
c1 = false;
else
if (b(i) == 'w' || b(i) == 'x' || b(i) == 'y')
c1 = false;
return
end
c1 = true;
end
end
% ends(s) is TRUE <=> k0,...k ends with the string s.
function s = ends(str, b, k)
global j;
if (str(length(str)) ~= b(k))
s = false;
return
end % tiny speed-up
if (length(str) > k)
s = false;
return
end
if strcmp(b(k-length(str)+1:k), str)
s = true;
j = k - length(str);
return
else
s = false;
end
end
% setto(s) sets (j+1),...k to the characters in the string s, readjusting
% k accordingly.
function so = setto(s, b, k)
global j;
for i = j+1:(j+length(s))
b(i) = s(i-j);
end
if k > j+length(s)
b((j+length(s)+1):k) = '';
end
k = length(b);
so = {b, k};
end
% rs(s) is used further down.
% [Note: possible null/value for r if rs is called]
function r = rs(str, b, k, k0)
r = {b, k};
if measure(b, k0) > 0
r = setto(str, b, k);
end
end
% step1ab() gets rid of plurals and -ed or -ing. e.g.
% caresses -> caress
% ponies -> poni
% ties -> ti
% caress -> caress
% cats -> cat
% feed -> feed
% agreed -> agree
% disabled -> disable
% matting -> mat
% mating -> mate
% meeting -> meet
% milling -> mill
% messing -> mess
% meetings -> meet
function s1ab = step1ab(b, k, k0)
global j;
if b(k) == 's'
if ends('sses', b, k)
k = k-2;
elseif ends('ies', b, k)
retVal = setto('i', b, k);
b = retVal{1};
k = retVal{2};
elseif (b(k-1) ~= 's')
k = k-1;
end
end
if ends('eed', b, k)
if measure(b, k0) > 0;
k = k-1;
end
elseif (ends('ed', b, k) || ends('ing', b, k)) && vowelinstem(b, k0)
k = j;
retVal = {b, k};
if ends('at', b, k)
retVal = setto('ate', b(k0:k), k);
elseif ends('bl', b, k)
retVal = setto('ble', b(k0:k), k);
elseif ends('iz', b, k)
retVal = setto('ize', b(k0:k), k);
elseif doublec(k, b, k0)
retVal = {b, k-1};
if b(retVal{2}) == 'l' || b(retVal{2}) == 's' || ...
b(retVal{2}) == 'z'
retVal = {retVal{1}, retVal{2}+1};
end
elseif measure(b, k0) == 1 && cvc(k, b, k0)
retVal = setto('e', b(k0:k), k);
end
k = retVal{2};
b = retVal{1}(k0:k);
end
j = k;
s1ab = {b(k0:k), k};
end
% step1c() turns terminal y to i when there is another vowel in the stem.
function s1c = step1c(b, k, k0)
global j;
if ends('y', b, k) && vowelinstem(b, k0)
b(k) = 'i';
end
j = k;
s1c = {b, k};
end
% step2() maps double suffices to single ones. so -ization ( = -ize plus
% -ation) maps to -ize etc. note that the string before the suffix must give
% m() > 0.
function s2 = step2(b, k, k0)
global j;
s2 = {b, k};
switch b(k-1)
case {'a'}
if ends('ational', b, k)
s2 = rs('ate', b, k, k0);
elseif ends('tional', b, k)
s2 = rs('tion', b, k, k0);
end;
case {'c'}
if ends('enci', b, k)
s2 = rs('ence', b, k, k0);
elseif ends('anci', b, k)
s2 = rs('ance', b, k, k0);
end;
case {'e'}
if ends('izer', b, k)
s2 = rs('ize', b, k, k0);
end;
case {'l'}
if ends('bli', b, k)
s2 = rs('ble', b, k, k0);
elseif ends('alli', b, k)
s2 = rs('al', b, k, k0);
elseif ends('entli', b, k)
s2 = rs('ent', b, k, k0);
elseif ends('eli', b, k)
s2 = rs('e', b, k, k0);
elseif ends('ousli', b, k)
s2 = rs('ous', b, k, k0);
end;
case {'o'}
if ends('ization', b, k)
s2 = rs('ize', b, k, k0);
elseif ends('ation', b, k)
s2 = rs('ate', b, k, k0);
elseif ends('ator', b, k)
s2 = rs('ate', b, k, k0);
end;
case {'s'}
if ends('alism', b, k)
s2 = rs('al', b, k, k0);
elseif ends('iveness', b, k)
s2 = rs('ive', b, k, k0);
elseif ends('fulness', b, k)
s2 = rs('ful', b, k, k0);
elseif ends('ousness', b, k)
s2 = rs('ous', b, k, k0);
end;
case {'t'}
if ends('aliti', b, k)
s2 = rs('al', b, k, k0);
elseif ends('iviti', b, k)
s2 = rs('ive', b, k, k0);
elseif ends('biliti', b, k)
s2 = rs('ble', b, k, k0);
end;
case {'g'}
if ends('logi', b, k)
s2 = rs('log', b, k, k0);
end;
end
j = s2{2};
end
% step3() deals with -ic-, -full, -ness etc. similar strategy to step2.
function s3 = step3(b, k, k0)
global j;
s3 = {b, k};
switch b(k)
case {'e'}
if ends('icate', b, k)
s3 = rs('ic', b, k, k0);
elseif ends('ative', b, k)
s3 = rs('', b, k, k0);
elseif ends('alize', b, k)
s3 = rs('al', b, k, k0);
end;
case {'i'}
if ends('iciti', b, k)
s3 = rs('ic', b, k, k0);
end;
case {'l'}
if ends('ical', b, k)
s3 = rs('ic', b, k, k0);
elseif ends('ful', b, k)
s3 = rs('', b, k, k0);
end;
case {'s'}
if ends('ness', b, k)
s3 = rs('', b, k, k0);
end;
end
j = s3{2};
end
% step4() takes off -ant, -ence etc., in context <c>vcvc<v>.
function s4 = step4(b, k, k0)
global j;
switch b(k-1)
case {'a'}
if ends('al', b, k)
end;
case {'c'}
if ends('ance', b, k)
elseif ends('ence', b, k)
end;
case {'e'}
if ends('er', b, k)
end;
case {'i'}
if ends('ic', b, k)
end;
case {'l'}
if ends('able', b, k)
elseif ends('ible', b, k)
end;
case {'n'}
if ends('ant', b, k)
elseif ends('ement', b, k)
elseif ends('ment', b, k)
elseif ends('ent', b, k)
end;
case {'o'}
if ends('ion', b, k)
if j == 0
elseif ~(strcmp(b(j),'s') || strcmp(b(j),'t'))
j = k;
end
elseif ends('ou', b, k)
end;
case {'s'}
if ends('ism', b, k)
end;
case {'t'}
if ends('ate', b, k)
elseif ends('iti', b, k)
end;
case {'u'}
if ends('ous', b, k)
end;
case {'v'}
if ends('ive', b, k)
end;
case {'z'}
if ends('ize', b, k)
end;
end
if measure(b, k0) > 1
s4 = {b(k0:j), j};
else
s4 = {b(k0:k), k};
end
end
% step5() removes a final -e if m() > 1, and changes -ll to -l if m() > 1.
function s5 = step5(b, k, k0)
global j;
j = k;
if b(k) == 'e'
a = measure(b, k0);
if (a > 1) || ((a == 1) && ~cvc(k-1, b, k0))
k = k-1;
end
end
if (b(k) == 'l') && doublec(k, b, k0) && (measure(b, k0) > 1)
k = k-1;
end
s5 = {b(k0:k), k};
end

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回答（1 个）

Walter Roberson
Walter Roberson 2016-4-18
Your routine simple() returns a cell array of strings, but your code expects a string.
Change your lines
%function [stem] = porterdupe(y)
function stems = porterdupe(~)
t = simple();
to
function [stem] = porterdupe(y)
t = y;
Add a new file find_stems.m
function results = find_stems()
t = simple();
results = cellfun(@porterdupe, t);
Now instead of running porterdupe directly, run find_stems

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