将数组合并为一个字符串（matlab）

Question

I have something like the following:

A = [1 2 5; 1 5 7];

B = A(1,:);

I output B:

B = A(1,:);

B =

 1     2     5

I am looking to combine what is contained in B into one single string:

1/2/5

Answer 1

You can use sprintf :

sprintf('%d/',B)

This will give you almost what you want, it will have unnecessary / in the end.

>> sprintf('%d/',B)

ans =

1/2/5/

If you want to remove it:

st = sprintf('%d/',B);
st(end) = [];

As @hmuster points out correctly, it is possible to do it with \\b , the backspace character.

st = [sprintf('%d/',B) sprintf('\b')];

However, as @AndrewJanke points out correctly, it could become a problem if this string is written into a pipe or a file. So use it with caution.

Answer 2

If you want it done properly (IE reusable), there are two steps:

1. Convert your numbers to strings (this will allow later crazy values to be converted properly with num2str http://www.mathworks.com/help/matlab/ref/num2str.html

2. Concatenate your strings horizontally (you can use MATLAB concatenation property A = [BC]), but the functional way is strcat http://www.mathworks.com/help/matlab/ref/strcat.html