write a code to sort string

2021 3 17
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更新时间：2021 3 18
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how to I write a code for this problem:
Write a program that accepts a string from a user with the input function, chops that string into a series of tokens, sorts the tokens into ascending order, and prints them out.
this is what I wrote so far I dont know what to do
%Input a user string
str=input('Enter string:','s');
[token,remain]=strtok(str,',')

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ANKUR KUMAR
ANKUR KUMAR 2021-3-17
Could you please elaborate "chops that string into a series of tokens"? Where comes the token in the string?
Aminata camara
Aminata camara 2021-3-17
that what the problem is saying, I understand it like when I'm writting a series of world
example if a user enter : anna,mimi,jen
the user will get
'anna'
'mimi'
'jen'
also I dont get what the problem is saying by then sort that information.

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ANKUR KUMAR
ANKUR KUMAR 2021-3-17

0 个投票

str=input('Enter string:','s');
strsplit(str,',')
On which basis you wish to sort strings? Is it alphabatically, or based on the length ?

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Aminata camara
Aminata camara 2021-3-17
Thank you so much, alphabatically also what if I want to do it with length can you please show me both ways
Walter Roberson
Walter Roberson 2021-3-17
Ran in:
Ran in:
Hint:
A = {{'wawa', 'zone'}; {'snark', 'bellman', 'banker'}; {'zoiks'}};
for K = 1 : length(A); disp(A{K}); end
{'wawa'} {'zone'} {'snark'} {'bellman'} {'banker'} {'zoiks'}
B = [2, 3, 1]
B = 1×3
2 3 1
[~, idx] = sort(B)
idx = 1×3
3 1 2
C = A(idx);
for K = 1 : length(C); disp(C{K}); end
{'zoiks'} {'wawa'} {'zone'} {'snark'} {'bellman'} {'banker'}
Now suppose B was the length() of each entry in A...
ANKUR KUMAR
ANKUR KUMAR 2021-3-17
If you wish to sort alphabetically, you can use sort command:
sort(strsplit(str,','))
Aminata camara
Aminata camara 2021-3-17
Thank you so much ANKUR KUMAR thanks a lot. I have a lastly question what if I want to sort by length?
ANKUR KUMAR
ANKUR KUMAR 2021-3-17
a_split = strsplit(str,',');
[~,strlen] = sort(cellfun(@length,a_split),'ascend');
a_sort = a_split(strlen);
Walter Roberson
Walter Roberson 2021-3-17
@Aminata camara
In my example, how do you suppose you might be able to set B to be a vector equal to the length of each cell in A ?
Because once you have that, then my example is sorting by that value.
Aminata camara
Aminata camara 2021-3-17
Thank you a lot Walter Roberson, I just started Matlab learning and some in the example you gave, I'm a little confused about [~,idx] and A(idx); I highly appreciate your help. Thank you again
Walter Roberson
Walter Roberson 2021-3-18
Ran in:
Ran in:
B = [8, -2, 11]
B = 1×3
8 -2 11
[sortedB, idx] = sort(B)
sortedB = 1×3
-2 8 11
idx = 1×3
2 1 3
So the first output of sort(B) is the list of sorted values (by default in ascending order.)
The second output of sort() tells you where each of the outputs came from in the original vector. So where the first entry, idx(1) is 2, that tells you that B(2) was the value that sorted into first place. The second entry, idx(2) is 1, telling you that B(1) was the entry that sorted second. The third entry, idx(3) is 3, telling you that B(3) is the entry in B that sorted third.
When you have that kind of order information, you can use it to index another array, and the result is reordering the other array to have order corresponding (increasing) B.
The syntax
[~, idx] = sort(B)
means the same as
[AnInternalVariableNameIsHere, idx] = sort(B);
clear AnInternalVariableNameIsHere
That is, the output is generated, but it is thrown away immediately. Using ~ is a short way to ignore an output when you need to access a later output.
Aminata camara
Aminata camara 2021-3-18
ooh I see now thank you for the great explanation

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