I want to delete some lines from a .txt file

I WANT TO REMOVE LINES WHICH CONTAINS CHARACTERS AND ALPHABETS AND I WANT TO RETAIN ONLY NUMBERS IN A TEXT DOCUMENT USING MATLAB. SOME ONE PLEASE HEP ME IN DOING SO. In the above text file, there are some lines like 'HUMAN DETECTED' 'Animal Detected'. I want to create a new file which contains only numbers and not these lines containing alphabetic messages.

[KSSV]

where is the text file?

[RANJITHA H V]

here there is attached file. please find the attachment.

Answer 1

[Azzi Abdelmalek]

line='I want to delete 123  lines from 24 .txt file 0.458 and67.45'
out=regexp(line,'\d+(\.)?\d+','match')

Answer 2

[Azzi Abdelmalek]

fid=fopen('12-04-16-10-01-16.txt')
M=textscan(fid,repmat('%f ',1,16))
fclose(fid)
out=cell2mat(M)