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

Question

Elisa 2013-10-2

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评论： Sean de Wolski 2013-10-4

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 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.

Elisa 2013-10-2

thanks

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Answer 1

Walter Roberson 2013-10-2

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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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Walter Roberson 2013-10-3

Please show how you create the string and put it into the static text.

Elisa 2013-10-3

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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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Answer 2

Sean de Wolski 2013-10-3

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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)).').',' ');