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

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!

[Walter Roberson]

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]

thanks

Answer 1

[Walter Roberson]

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]

[Elisa]

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]

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]

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]

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

[Elisa]

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!!!!!!

Answer 2

[Sean de Wolski]

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

[Elisa]

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 :)

[Sean de Wolski]

strjoin is new in 13a I believe.