Matlab Concatenation of Strings and Numbers

Question

I have two 1-by-n matrices A and B. A is full of strings 'test' 'test2' 'test3; and so on and B has numbers 123, 4567, 89 and so on.

How do I interweave these two to get output like

test       123
test2     4567
test3       89

as a string?

My current issue is that strings have variable lengths and so [A; B] leads to problems with mismatched dimensions.

Are your test, test2 stored as cells? And how about the numbers? You can't have strings and numbers in a regular array in MATLAB. cells are your best bet... — Stewie Griffin
– Stewie Griffin, Commented Nov 18, 2013 at 20:56
If the test# strings are of variable length, then how are you starring them in A currently? Either A is not a matrix and is a cell array or the strings are already padded with spaces (or some other black character). And what is class(B)? char or double? — horchler
– horchler, Commented Nov 18, 2013 at 20:59
You may need a cell array of cell arrays to deal with mismatched lengths, but in general, the approach here may be of help. — chappjc
– chappjc, Commented Nov 18, 2013 at 21:03
@thewaywewalk: I disagree. It's not possible to use the same approach when strings are involved. — Stewie Griffin
– Stewie Griffin, Commented Nov 19, 2013 at 9:55

marsei · Accepted Answer · 2013-11-18 22:22:00Z

0

You may want to concatenate an array of strings (here A is a cell array, transformed into a char array A2) with a second array of strings (B2) corresponding to your numerical values B. The double to string conversion uses sprintf. The %d stands for integer format.

This code

A = {'test'; 'test2'; 'test3'}           %cell of strings      
B = [123; 4567; 89]                      %array of doubles 

A2 = char(A);                            %array of strings
B2 = reshape(sprintf('%8d',B), 8, [])';  %convert to integer + char + reshape + transpose
[A2 B2]

produces a char array where the number part are made of 8 char

ans =

test      123
test2    4567
test3      89

edited Nov 18, 2013 at 22:22

answered Nov 18, 2013 at 21:40

marsei

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