Help with a function in a loop

Question

googo 2013-4-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/72365-help-with-a-function-in-a-loop

For example:

sampledata:
hello world
hello
hello world world
for i=1:size(sampleData,1) 
    [x y]=ngramsFreq(sampleData{i},n) 
end
% ngramsFreq is a function that returns the frequence and sequences of n letters

I want to caculate x and y for each sentence and store it that after the loop ends and get the specific data for each sentence, how could I do it? I thought bulding a matrix but the size of x and y for each sentence is not equal.

could you help me? Thank's!

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Answer 1

Andrei Bobrov 2013-4-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/72365-help-with-a-function-in-a-loop#answer_82511

在 MATLAB Online 中打开

function [s1, f] = ngramsfreq(str,n)
    n1 = numel(str) - n + 1;
    s1 = str(hankel(1:n1,n1:n1+n-1));
    [s1,~,c] = unique(s1,'rows','stable');
    f = accumarray(c,ones(n1,1));
end

using

str = {'hello world','hello','hello world world'};
n = 2;
nn = numel(str);
S = cell(nn,1);
F = S;
for jj = 1:nn
    [S{jj}, F{jj}] = ngramsfreq(str{jj},n);
end

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googo 2013-4-17

Thank you!

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Answer 2

Yao Li 2013-4-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/72365-help-with-a-function-in-a-loop#answer_82493

在 MATLAB Online 中打开

sampledata={'hello world','hello','hello world world'};
length(sampledata)
for i=1:length(sampledata)
    for j=1:length(sampledata{i})
        [x{i} y{i}]=%add your function here
    end
end

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googo 2013-4-17

maybe a simple question that whould help figure this out. when I'm writing [x{1} y{2}] , what does it mean?

googo 2013-4-17

please look here : http://blogs.mathworks.com/videos/2011/03/09/how-to-store-a-series-of-vectors-from-a-for-loop/

He explain how to store a series of vectors from a for loop but each vector has the same length. How could I store it when the lengths are diffrent?

I understand you use x{i} y{i} but when i'm typing x{1} [2 2 2] for example I get "Cell contents assignment to a non-cell array object." and don't understand the meaning.

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