Join strings together with '_' between them

Hello everybody,

I have a two vectors and I would like to join together with a and b below with some repetition.

The output I want is c1 as below. I made the characters before _ using repmat function.

and made the characters after _ using repelem function.

However, I failed to join them togerther with '_' between them.

Please give me some helps to join them togerther ?

clc; close all; clear;
a = {'A11';'A12';'A21';'A22';'A23';'A24'};
b = {'A300';'A5300';'A291';'A5291'};
c1 = [repmat(a,length(b),1) , '_' , repelem(b,length(a),1)];

% c1 = ['A11_A300';'A12_A300';'A21_A300';'A22_A300';'A23_A300';'A24_A300';...
% 'A11_A5300';'A12_A5300';'A21_A5300';'A22_A5300';'A23_A5300';'A24_A5300';...
% 'A11_A291';'A12_A291';'A21_A291';'A22_A291';'A23_A291';'A24_A291';...
% 'A11_A5291';'A12_A5291';'A21_A5291';'A22_A5291';'A23_A5291';'A24_A5291']

Answer 1

[KSSV]

a = {'A11';'A12';'A21';'A22';'A23';'A24'};
b = {'A300';'A5300';'A291';'A5291'};

a1 = repmat(a,length(b),1) ;
b1 = repelem(b,length(a),1);
m = repelem('_',length(a1),1) ; 
ab = strcat(a1,m,b1) 

ab = 24×1 cell array
    {'A11_A300' }
    {'A12_A300' }
    {'A21_A300' }
    {'A22_A300' }
    {'A23_A300' }
    {'A24_A300' }
    {'A11_A5300'}
    {'A12_A5300'}
    {'A21_A5300'}
    {'A22_A5300'}
    {'A23_A5300'}
    {'A24_A5300'}
    {'A11_A291' }
    {'A12_A291' }
    {'A21_A291' }
    {'A22_A291' }
    {'A23_A291' }
    {'A24_A291' }
    {'A11_A5291'}
    {'A12_A5291'}
    {'A21_A5291'}
    {'A22_A5291'}
    {'A23_A5291'}
    {'A24_A5291'}

[Smithy]

Wow... thank you very mcuh. I really really appreciate with it. It works perfect.

Answer 2

[Steven Lord]

Use the string append operator +.

a = {'A11';'A12';'A21';'A22';'A23';'A24'};
b = {'A300';'A5300';'A291';'A5291'};
C1 = a + "_" + b.'

C1 = 6×4 string array
    "A11_A300"    "A11_A5300"    "A11_A291"    "A11_A5291"
    "A12_A300"    "A12_A5300"    "A12_A291"    "A12_A5291"
    "A21_A300"    "A21_A5300"    "A21_A291"    "A21_A5291"
    "A22_A300"    "A22_A5300"    "A22_A291"    "A22_A5291"
    "A23_A300"    "A23_A5300"    "A23_A291"    "A23_A5291"
    "A24_A300"    "A24_A5300"    "A24_A291"    "A24_A5291"

C2 = a.' + "_" + b

C2 = 4×6 string array
    "A11_A300"     "A12_A300"     "A21_A300"     "A22_A300"     "A23_A300"     "A24_A300" 
    "A11_A5300"    "A12_A5300"    "A21_A5300"    "A22_A5300"    "A23_A5300"    "A24_A5300"
    "A11_A291"     "A12_A291"     "A21_A291"     "A22_A291"     "A23_A291"     "A24_A291" 
    "A11_A5291"    "A12_A5291"    "A21_A5291"    "A22_A5291"    "A23_A5291"    "A24_A5291"

[Smithy]

Thank you very mcuh. It works really well.