How do I add space between strings when I am using randperm?

2013 10 2
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更新时间：2013 10 4
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1 个投票

Sorry, I'm not expert but I'm learning.
I've tried some answer regarding how to add space between strings, but it seems that these methods do not apply when using a random generation of string.
If I use matrix concatenation (horzcat): ['A', ' ', 'B'] it will generate the space randomly.
if I use STRCAT then it give me error 'index exceed size of matrix' whatever I do.
This is my code:
string = ['BCDFGHKJLMNPQRSTVWXYZ'];
numRands = length(string);
set_length = 5;
set_string = string( round(randperm(21,set_length))); %21 consonants
Thanks a lot in advance for any help you might provide!

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Walter Roberson
Walter Roberson 2013-10-2
randperm(21, set_length) is going to produce a list of integers. There is no point in round()'ing the integers before using them as indices.

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 采纳的回答

Walter Roberson
Walter Roberson 2013-10-2

1 个投票

There is a trick to using strcat() to add a space: strcat() will disregard leading or trailing spaces on strings, but will not do so for a cell array of strings. So you can use
set_string1 = string( round(randperm(21,set_length)));
set_string2 = string( round(randperm(21,set_length)));
strcat(set_string1, {' '}, set_string2)
Or, considering that set_string1 and set_string2 are just simple vector of character,
[set_string1, ' ', set_string2]

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Elisa
Elisa 2013-10-2
Thanks a lot walter,
However, unfortunately, it gives me something like that:
BCDFG HTGRW
While I would like:
G T H J K
Thanks again, anyway!!!
Walter Roberson
Walter Roberson 2013-10-2
Your question asked for a space between strings, not for a space between characters.
set_string1 = string( randperm(21,set_length) );
reshape([set_string1; blanks(set_length)], 1, [])
Elisa
Elisa 2013-10-3
Thanks a lot walter!!!
It works actually, however, strangely, it does it just on the 'command window' not on the 'static test' of the GUI I'm programming. I don't know why(!?).
thanks a lot anyway
Walter Roberson
Walter Roberson 2013-10-3
Please show how you create the string and put it into the static text.
Elisa
Elisa 2013-10-3
thanks a lot Walter. Now, I've solved it!
I needed to define that your code is in fact my variable:
string = 'BCDFGHJKLMNPQRSTVWXYZ';
numRands = length(string);
set_length = 5;
set_string = string( randperm(21,set_length)); %21 consonants
set_string = reshape([set_string; blanks(set_length)], 1, []);
set(handles.show_set_string_inStaticTextInGUI,'String',set_string);
Thanks a lot!!!!!!

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更多回答（1 个）

Sean de Wolski
Sean de Wolski 2013-10-3

0 个投票

You could also do this with strjoin (13a or newer)
string = ['BCDFGHKJLMNPQRSTVWXYZ'];
numRands = length(string);
set_length = 5;
set_string = strjoin(cellstr(string(randperm(21,set_length)).').',' ');

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Elisa
Elisa 2013-10-3
Thanks a lot Sean, but this give me error
Undefined function 'strjoin' for input arguments of type 'cell'.
Anyway, I solved it with Walter method.
Thanks a lot anyway!!! I've learned a lot of new things :)

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