Need to sort the number in the increasing order using MATLAB script, shown as a sample text file.

The current avilable pattern is as follows,

0.0,A

2.0,B

5.00,C

0.10,D

5.00,E

0.10,F

1.00,G

0.10,H

10.00,I

0.10,J

2.0,K

2.0,L

2.0,M

5.00,N

0.10,O

10.00,P

0.10,Q

The required pattern is as follows,

0.0,A

0.10,D

0.10,F

0.10,H

0.10,J

0.10,O

0.10,Q

1.00,G

2.0,B

2.0,K

2.0,L

2.0,M

5.00,C

5.00,E

5.00,N

10.00,I

10.00,P

Answer 1

[Stephen23]

You could download my FEX submission natsort:

https://www.mathworks.com/matlabcentral/fileexchange/34464-customizable-natural-order-sort

And then import your file into a cell array of character vectors C:

C = regexp(fileread('new.txt'),'\S+','match');
D = natsort(C,'\d+\.?\d*'); % sort into the requested order.

Where D contains the sorted character vectors, which you can check:

>> D(:)
ans = 
    '0.0,A'
    '0.10,D'
    '0.10,F'
    '0.10,H'
    '0.10,J'
    '0.10,O'
    '0.10,Q'
    '1.00,G'
    '2.0,B'
    '2.0,K'
    '2.0,L'
    '2.0,M'
    '5.00,C'
    '5.00,E'
    '5.00,N'
    '10.00,I'
    '10.00,P'

If you want, save it to file:

[fid,msg] = fopen('out.txt','wt');
assert(fid>=3,msg)
fprintf('%s\n',D{:});
fclose(fid);

[Ravi Shankar]

Hi Stephen,

Thanks for the information that you provided.

I am able to read the content inside Text File which this command,

C = regexp(fileread('new.txt'),'\S+','match');

After that when i run this below command i am getting following error,

D = natsort(C,'\d+\.?\d*');

Undefined function or variable 'natsort'.

Can you help me on this issue.

Thank you,

[Stephen23]

"Can you help me on this issue."

Of course. Here is the very first sentence of my answer:

"You could download my FEX submission natsort:"

Did you DOWNLOAD my FEX submssion from the link that I gave you? You will then need to unzip it into the current folder (or somewhere on the MATLAB Search Path).

[Ravi Shankar]

Thanks for the information Stephen.

Answer 2

[Andrei Bobrov]

T = readtable('new.txt')
T = sortrows(T)
writetable(T,'new2.txt','delimiter',',','WriteVariableNames',0)

[Stephen23]

Note that this method changes the numeric data format, the output file looks like this:

0.1,D
0.1,F
0.1,H
0.1,J
0.1,O
0.1,Q
1,G
2,B
2,K
2,L
2,M
5,C
5,E
5,N
10,I
10,P

Given the varaible number of trailing digits, it would be fiddly to make this work using writetable. The answer I provided gives the data in exactly the format shown in the question (i.e. unchanged from the input format).

[Ravi Shankar]

Thanks for the information Andrei Bobrov.