how to get the most frequent words

how can i creat a function with input n and return as output paramer a cell array which will contains the n most frequent words in a text together with the number of times they appeared and return same withleast frequent words and I have a seperet text file.

many thanks

Answer 1

[Matt J]

Say str is your text. Then you could get a histogram of all the words in str by doing,

   [u,i,j]=unique(strsplit(str));
   H=histcounts(j,1:max(j)+1)

[Dezdi]

my input has to be n and output I think only two parameter

I started like this

function [most least]=myfunc(n)

but not sure how to look for the same words in the text.

[Matt J]

but not sure how to look for the same words in the text.

You should think hard about how to incorporate the code that I gave you.

[Dezdi]

but how import the word into the cell arrey

it counts the word but only numbers and not the word shown.

[Matt J]

For example, if you have the histogram output, H and you want the top 3 most frequent words,

[freq,idx]=maxk(H,3);

 words = u(idx),

[Steven Lord]

Let's choose a sample piece of text (thanks to Mr. Dickens and Earl Bulwer-Lytton):

str = 'it was the best of times it was the worst of times it was a dark and stormy night';
[u,i,j]=unique(strsplit(str));
H=histcounts(j,1:max(j)+1);

The +1 in the histcounts call is necessary so the last bin does not contain both max(j) and max(j)-1. Look at the elements of u and H. To see them side-by-side easily I'll put them in a table.

t = table(u.', H.', 'VariableNames', {'u', 'H'})

Looking at the information in the table t, what would you assign to the most and least variables if you were solving this problem manually? How do you think you could generate those most and least variables in your program using the information stored in the u and H variables?

[Dezdi]

table doesnt work for me.

I get the u meaning but what is i and idx?

it will return me with the maxk(H,3) only numbers if I put them into word give me the same word.

How I could put them into a cell array which contains the word and how many times was in it ?