how to concatenate string and number

Hello ,

I want to concatenate string and number in for loop

requestID = Req_Check;
for k = 1 : 10
    requestID = requestID +1;
end

I am expecting requestID after for loop like Req_Check_1, Req_Check_2 ...Req_Check_10

How can I do this?

[Amir Moslemi]

use "strcat" such that in each iteration convert number to string by "num2str" and eventually strcat(s1,s2). s1 your str and s2 your number(converted to string)

Answer 1

[Star Strider]

Two (of perhaps many) possibilities:

requestIDs = 'Req_Check';
for k = 1 : 10
    requestID(k,:) = [requestIDs '_' num2str(k,'%02d')];        % Character Array
end

requestIDs = 'Req_Check';
for k = 1 : 10
    requestID{k} = [requestIDs '_' num2str(k,'%d')];            % Cell Array
end

The first creates a character array and produces a two-digit number filed so all are of equal length. The second uses a cell array, so the lengths don’t have to be equal.

[gvreddy]

Thank you Star and Stephen..

[Stephen23]

Using sprintf rather than string concatenation is often clearer and faster:

str = 'Req_Check';
for k = 10:-1:1
    out{k} = sprintf('%s_%d',str,k);
end

OR

for k = 10:-1:1
    out{k} = sprintf('Req_Check'_%d',k);
end

[gvreddy]

Thanks again for explanation, then I prefer sprintf here. and I want to find the number from string 'Req_Check_10'. I am using regexp like below:

    [D,S]=regexp('Req_Check_10','([0-9])','match')

but its giving me indiviual numbers like 1,0.

Could you please help me on this?

[Stephen23]

[D,S] = regexp('Req_Check_10','\d+','match','split')

Answer 2

[cesar silva]

People like to make all complicated...

Concatenate 2 words

a='hi';

b='you'

c=[a b]

Concatenate word + number

a = num2str(2)

b = 'you'

c = [b a] or... if you want... c = [b '_' a]

will give you: you2 or you_2

SIMPLICITY IS SO SEXY...

[Victor Matzkin]

If you think that's simple or intuitive, you're going to freak out when you discver another programming language..

[Daniel Posadas]

I'm agree with you, this one helped me out easy and fast... as a sofware engineer I hate when my programmers want to make simple things as if they were very elaborated, wasting resources. Thanks

[Bogdan -Ervin]

It doesn't give me a single string. It gives me 2 strings for c=[b a] and 3 strings for c=[b '_' a].

Answer 3

[MathWorks Support Team]

requestID = "Req_Check"
requestIDs = requestID + "_" + (1:10)'

Please see the documentation for strings for more information.