combine two matrices to get another matrix of same size

I have two matrices of same order say 'a' and 'b':

a=[1,2;3,4];
b=[5,6;7,8];

How to combine these matrices in order to get a 3rd matrix of the form:

c=[15,26;37,48]

i.e. each cell of first matrix combine with corresponding cell of another matrix.

Answer 1

[madhan ravi]

>> a=string([1,2;3,4]);
   b=string([5,6;7,8]);
   c=str2double(strcat(a,b))

c =

    15    26
    37    48

>> 

[Stephen23]

This is a very inefficient approach to what is just some simple arithmetic.

See Bruno Luong's answer.

[madhan ravi]

Dude! How will you combine the below?

a = [11  3  5]
b = [ 7 3 11]  

[Jack]

a.*10.^(floor(log10(b)+1))+b

[Ani Asoyan]

madhan ravi Your answer is great, but it doesn't work with negative numbers (when the second matrix's element is negative). What can I do?

[Walter Roberson]

First you need to define what the expected results would be for negative values.

[Ani Asoyan]

Walter Roberson

I'm sorry how can I do that? .. I make a code with a loop so that when I change one number/parameter, the results will automatically be changed..

[Walter Roberson]

What result do you expect for

[ 1  2
 -3 -4]

Combined with

[ 5 -6
  7 -18]

[Ani Asoyan]

[15 2-6

-37 -4-18]

[Walter Roberson]

That is not valid in MATLAB unless you switch to string. It is not possible to have a numeric entry that has a negative sign in the middle of it and have the negative preserved.

[Ani Asoyan]

ok I got it. Thank you very much

Answer 2

[Bruno Luong]

>> a=[1,2;3,4];
>> b=[5,6;7,8];
>> a*10+b

ans =

    15    26
    37    48

[tanveer haq]

Thanks a lot Bruno Luong and madhan ravi.

[madhan ravi]

+1 , this is the efficient method @Tanveer

[tanveer haq]

Ok madhan ravi.