how to add space between matrix elements?
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hi guys am working on binary matrix, and i want a code to add space between matrix elements?
matrix as :
11001110;11001111;00011100;111000010
some matrix are (33X33)
Accepted Answer
David Young
on 14 Dec 2014
So another guess is that the input is in fact a double matrix, but the idea is that there ought to have been spaces between the original characters from which it was read.
That is,
m = [11001110;11001111;00011100;11100001]; % extra 0 omitted at end
but we would have liked to have had
mCorrect = [1 1 0 0 1 1 1 0; 1 1 ... ];
If so, m can be converted to a cell array of strings with
mstr = arrayfun(@(x) sprintf('%08u', x), m, 'UniformOutput', false);
and then to a double array but only with the values 0 and 1 stored in it with
mbin = cell2mat(cellfun(@(s) s - '0', mstr, 'UniformOutput', false));
If, however, you want a cell array of strings with spaces in you can do more or less what Guillaume said:
mwithspaces = regexprep(mstr, '.(?=.)', '$0 ');
3 Comments
Guillaume
on 15 Dec 2014
You still haven't told us what form your input matrix takes. So it's difficult to tell you how to solve your issue.
Also, as a rule don't accept an answer if it doesn't fully answer your question. People don't tend to look at posts once an answer has been accepted.
David Young
on 15 Dec 2014
Yes, as Guillaume says, it's difficult to work out the solution without knowing the input. Can you show us how the large matrix is defined?
More Answers (1)
Guillaume
on 14 Dec 2014
It's always a good idea to give an example of inputs that is a valid matlab expression and an example of output.
Assuming your input is a 2D array of char and that you want to add spaces between columns:
m = ['11001110';'11001111';'00011100';'11100001'] %had to remove a 0 from the end of the last element in your example
mwithspaces = cell2mat(regexprep(num2cell(m, 2), '.(?=.)', '$0 '))
8 Comments
sara
on 14 Dec 2014
Guillaume
on 14 Dec 2014
As stated, it assumes the input is a 2D array of char.
Your input obviously isn't. What is it?
sara
on 15 Dec 2014
Guillaume
on 15 Dec 2014
The 'spaces' between the elements in mCorrect are just spaces that matlab prints when you display the matrix. They're not part of the matrix.
So I guess your question is how to generate that matrix of zeros and ones. We need to know the exact form of your input to be able to answer that.
Or possibly more relevant, is how do you get your 'wrong' matrix in the first place? Most likely, you can generate the 'right' one to start with.
David Young
on 16 Dec 2014
Edited: David Young
on 16 Dec 2014
OK, I think the only way forward is to change the file containing the program, which includes the input data. This can be done manually or automatically. I can think of three possibilities:
- I guess you didn't type in all those numbers by hand. How were they generated? It might be easiest to change the program that generated them so that it inserts spaces.
- Otherwise, if you only have a few sets of numbers to change, it might be quickest for you to edit the program by hand, inserting single quotes round each 33-digit number. You can do this pretty quickly with the editor's find-and-replace, replacing < semicolon><space> with < quote><semicolon><space><quote> to do all except the first and last. This means the data will be read as strings and Guillaume's technique for inserting spaces will work and you can move on.
- If you have many sets of data that all need changing, it would be possible to write a program to make the edits instead of doing it by hand. This isn't a big task but you might have to wait a little while for it.
Sarah, unfortunately you cannot store binary numbers that big the way you have done (as double). The biggest integer you could store that way in matlab would have at most 15 digits. Yours have 33!
To prove it:
a = 110011100010101011100010101010111; %the first element of your m
b = 110011100010101011100010000000000; %a different number with the same beginning
isequal(a, b) %return 1, which means they are equal
b = a
As it is your m is unusable. You've already lost the true value of your numbers. Therefore as David said and as I suggested, you need to change the way you load / create these numbers in the first place. Either load / generate them as strings, or as decimal numbers, or as you want as a matrix of 0 and 1.
Without seeing the code that creates / loads m we can't really help you further. I suggest you start a new question for this.
kavitha sundu
on 10 Oct 2016
Hey,Sarah. I have a similar problem .Did you by any chance found the answer??
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